WO1998034338A1 - Programmable crystal oscillator - Google Patents
Programmable crystal oscillator Download PDFInfo
- Publication number
- WO1998034338A1 WO1998034338A1 PCT/US1998/001796 US9801796W WO9834338A1 WO 1998034338 A1 WO1998034338 A1 WO 1998034338A1 US 9801796 W US9801796 W US 9801796W WO 9834338 A1 WO9834338 A1 WO 9834338A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- circuit
- frequency
- accordance
- programmable
- crystal
- Prior art date
Links
- 239000013078 crystal Substances 0.000 title claims abstract description 104
- 239000003990 capacitor Substances 0.000 claims description 21
- 230000004044 response Effects 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims 2
- 238000010168 coupling process Methods 0.000 claims 2
- 238000005859 coupling reaction Methods 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 3
- 235000012431 wafers Nutrition 0.000 description 3
- 238000000034 method Methods 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 229920000729 poly(L-lysine) polymer Polymers 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
- H03B5/32—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator
- H03B5/36—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being semiconductor device
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
- H03L7/183—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between fixed numbers or the frequency divider dividing by a fixed number
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B19/00—Generation of oscillations by non-regenerative frequency multiplication or division of a signal from a separate source
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
- H03B5/32—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator
- H03B5/36—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being semiconductor device
- H03B5/366—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being semiconductor device and comprising means for varying the frequency by a variable voltage or current
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B2201/00—Aspects of oscillators relating to varying the frequency of the oscillations
- H03B2201/02—Varying the frequency of the oscillations by electronic means
- H03B2201/025—Varying the frequency of the oscillations by electronic means the means being an electronic switch for switching in or out oscillator elements
- H03B2201/0266—Varying the frequency of the oscillations by electronic means the means being an electronic switch for switching in or out oscillator elements the means comprising a transistor
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J2200/00—Indexing scheme relating to tuning resonant circuits and selecting resonant circuits
- H03J2200/10—Tuning of a resonator by means of digitally controlled capacitor bank
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/085—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal
- H03L7/089—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal the phase or frequency detector generating up-down pulses
- H03L7/0891—Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal the phase or frequency detector generating up-down pulses the up-down pulses controlling source and sink current generators, e.g. a charge pump
- H03L7/0895—Details of the current generators
- H03L7/0898—Details of the current generators the source or sink current values being variable
Definitions
- the present invention relates to programmable crystal oscillators.
- the present invention is directed toward a programmable crystal oscillator having an adjustable capacitive load circuit coupled to the crystal.
- Crystal oscillators are widely used to generate timing signals for electronic hardware, such as computers, instrumentation, and telecommunications equipment.
- Crystal oscillators typically include a quartz crystal and an oscillator circuit, which electrically excites the crystakso as to generate an oscillating signal at a resonant frequency determined by physical characteristics of the crystal.
- the oscillator circuit or a separate output circuit (buffer) wave-shapes the oscillating signal into a timing pulse train acceptable to the electronic hardware.
- Timing frequencies are specified by the electronic hardware manufacturers and thus vary over a wide frequency range.
- a crystal's resonant frequency is determined by its physical characteristics, e.g., size, shape, crystalline structure, etc. Trimming the crystal's resonant frequency can be achieved by selective metal plating the crystal faces. Consequently, the manufacture of crystal oscillators is an involved process that is both time consuming and costly. Thus, suppliers of crystal oscillators stock large numbers of crystal oscillators manufactured to a variety of standard output frequencies.
- Custom crystal oscillators come at premium prices and require long manufacturing leadtimes (months).
- a timing circuit comprising a crystal for generating a source frequency, an oscillator circuit coupled to the crystal, and a programmable load circuit coupled to the crystal.
- a frequency multiplier circuit is coupled to the oscillator circuit to receive the adjusted source frequency.
- a programming circuit is included to supply first programming data to the programmable load circuit to adjust the crystal source frequency and second programming data to the frequency multiplier circuit.
- the frequency multiplier circuit supplies an output frequency equal to a product of the adjusted source frequency and a multiplication factor designated by the second programming data.
- Fig. 1 is a plan view illustrating an exemplary package configuration for a programmable crystal oscillator package in accordance with an embodiment of the present invention
- Fig. 2 is a block diagram of a programmable crystal oscillator in accordance with an embodiment of the present invention
- Fig. 3 is a detailed circuit schematic of a programmable capacitive load circuit included in the programmable crystal oscillator of Fig. 2;
- Fig. 4 is a schematic diagram of a phase locked loop circuit -mcluded in the programmable crystal oscillator of Fig. 2.
- a programmable crystal oscillator is provided with a memory for storing output frequency-defining parameters. Typically, one of these parameters is used to program an adjustable capacitive load circuit coupled to the crystal, thereby to adjust the source (resonant) frequency of the crystal. Additional parameters are used to program the output frequency of a phase-locked loop circuit coupled to receive the adjusted source frequency. A further parameter can also be used to divide the frequency output of the phase-locked loop circuit to thereby supply the desired output frequency.
- any crystal capable of oscillation may be utilized in a crystal oscillator in accordance with the present invention, which can then be programmed to generate a wide range of specified output frequencies.
- FIG. 1 An embodiment of a programmable crystal oscillator, in accordance with the present invention, is illustrated in Fig. 1.
- This oscillator 20 may be produced in a variety of industry standard sizes and in two basic package configurations, pin through and surface mounted (SMD), depending upon the manner in which the oscillator is to be mounted in its particular application.
- the illustrated embodiment has six input/output (I/O) terminals, consisting of a Signature clock terminal 21 , a dedicated Program input terminal 22, a ground (VSS) terminal 23, a supply voltage (VDD) terminal 24, a Signature output terminal 25, and a clock signal output (F out )/programming clock pulse input (CLK in ) terminal 26.
- I/O input/output
- VDD supply voltage
- F out clock signal output
- programming data is entered via terminal 22 at a timing controlled by clock pulses (CLK in ) applied to terminal 26.
- crystal oscillator 20 When programmable crystal oscillator 20 is programmed by the programming data, it produces a clock signal output (F out ) on terminal 26 of a programmed frequency conforming to a customer specified target frequency anywhere within a wide range, e.g., 380 KHz to 175 MHz, with an accuracy of ⁇ 100 ppm (parts per million) or better. In terms of percentage, 100 ppm is equal to ⁇ 0.01 % of the target frequency.
- crystal oscillator 20 includes a programmable read only memory (PROM) 50, (Fig.
- Programmable crystal oscillator 20 illustrated in greater detail by the block diagram of Fig. 2, includes a crystal blank 30 electrically connected between pads 31 and 32 on an integrated circuit chip for excitation by an oscillator circuit 34 and thus to generate a source oscillating signal.
- This oscillator circuit includes an arrangement of resistor, capacitor, and inverter components well known in the crystal oscillator art and, thus, need not be described here.
- the frequency of the source oscillating signal, appearing at the output of oscillator circuit 34 as a reference frequency signal F ref is largely determined by the physical characteristics of the crystal wafer.
- programmable crystal oscillator 20 accommodates a wide range of source frequencies, e.g., 5.6396 MHz to 27.3010 MHz. That is, the source frequency may vary from crystal to crystal within this range without jeopardizing the ability of crystal oscillator 20 to be programmed to output clock signals at any target frequency specified by a customer within, for example, a 380 KHz-175MHz range, with the industry standard accuracy of at least 100 ppm. In fact, the diverse crystal source frequencies need not be known in advance of programming.
- oscillator circuit 34 outputs the reference frequency F ref , which is applied to a frequency multiplier 36, illustrated in greater detail in Fig. 4.
- the frequency multiplier outputs clock signals at a frequency F p ⁇ to a frequency divider 38, which divides the frequency F pH by a programmable parameter N, received from programming network 42, to produce clock signals F out of a programmed frequency conforming to customer specification.
- the F out and F ref signals are applied as separate inputs to a multiplexor 40. Under the control of program control logic in programming network 42, imposed over line 43, multiplexor 40 outputs either clock signals F out or F ref through an output buffer 44 and onto terminal 26.
- crystal oscillator 20 further includes a pair of load circuits 46 and 48 that may be programmed, if necessary, to adjust the capacitive load on crystal 30 and, in turn, pull the crystal source frequency into a range of frequencies conducive to optimal programming of crystal oscillator 20 to achieve not only the output frequency accuracy specified by a customer, but also a low phase locked loop frequency conducive to stable operation of frequency multiplier 36.
- Load circuits 46 and 48 are illustrated in greater detail in Fig. 3.
- Load circuits 46 and 48 can include, for example, pluralities of capacitors 77 1 to 77 n and 87 1 to 87 n , respectively.
- Capacitors 77 1 to 77 n are respectively connected between ground and source electrodes of first switching elements or transistors 78 ! to 78 n
- capacitors Ql ⁇ to 87 n are respectively connected between ground and source electrodes of second switching elements or transistors 88 ! to 88 n .
- the gate of each of transistors 78 ⁇ to 78 n is connected by a corresponding one of output leads 76 ⁇ to 76 n from programming network 42, indicated collectively at 76 in Fig. 2.
- the drain electrodes of these transistors are connected in common to a source frequency input line 79 connecting crystal pad 31 to oscillator circuit 34.
- the gate electrodes are respectively connected to output leads 86 ! to 86 n from programming network 42, (collectively indicated at 86 in Fig. 2), and the drain electrodes of transistors 88 ! to 88 n are connected in common to source frequency input line 89 connecting crystal pad 32 to oscillator circuit 34.
- fixed capacitors 75 and 85 are provided as a nominal capacitance load for crystal blank 30.
- Each of capacitors 77 ⁇ to 77 n and 87 ! t° 87 n may have a capacitance of, for example, 5pf.
- capacitors 77 ⁇ to 77 n and 87 ! to 87 n are symmetrically connected into source frequency input lines 79 and 89, respectively, such that for each one of capacitors 77 ! to 7 n connected to source frequency input line 79, a corresponding one of capacitors 87 ⁇ to 87 n is connected to source frequency input line 89. Accordingly, pairs of capacitors 77 ! to 77 n and 87 ⁇ to 87 n (one from each group of capacitors 77 ! to 77 n and 87 !
- this capacitance loading adjustment is effective to pull the crystal source frequency up or down as required to adjust the reference clock signal frequency F ref to a value appropriate for optimal frequency programming of crystal oscillator 20.
- frequency multiplier 36 includes a frequency divider 52 that divides the reference frequency F ref by a programmable parameter Q stored in programming network 42 and applies the resultant clock signal frequency to a phase detector 54 of a phase locked loop (PLL).
- the phase locked loop includes a charge pump 56, a loop filter 60, and a voltage controlled oscillator 58 that produces the clock signal frequency pll going to frequency divider 38 in Fig. 2.
- This clock signal frequency F p n is also fed back through a frequency divider 64 to a second input of phase detector 54.
- Divider 64 divides the F pll frequency by a programmable parameter P also stored in programming network 42.
- parameters Q and P are supplied to program divider circuits 52 and 64, respectively, from programming network 42.
- Reference frequency F ref is thus divided by the programmed parameter Q in divider circuit 52.
- F ref corresponds to the source frequency of crystal 30, and is therefore typically in a range of 5.64 MHz to 27.3 MHz.
- Q is an integer within a range of 132 to 639, the quotient F re Q, i.e., the output of divider 52, can be made to fall within the range of 32 KHz to 50 KHz, regardless of the crystal source frequency.
- the quotient F re Q is the loop frequency of the phase locked loop circuit shown in Fig. 4.
- the loop frequency is supplied to phase comparator 54, along with the output of divider 64, which outputs a control signal typically at a frequency substantially equal to the difference between the output frequencies of dividers 52 and 64.
- the control signal is supplied to charge pump 56 which outputs a DC signal proportional to the frequency of the control signal.
- the loop filter 60 is provided at the output of charge pump 56 in order to define the response of the phase-locked loop circuit.
- the DC signal is next supplied to voltage controlled oscillator (VCO) 58, which outputs clock signal F pH of a frequency controlled by the potential of the DC signal.
- Clock signal F PLL is next fed back to one of the inputs of phase detector 64 via P divider 64. Accordingly, with this phase locked loop arrangement, F PLL is equal to the product of the loop frequency multiplied by programmable P, an integer in the range of 2048 to 4097, so that F PLL is within the range of 87.5 MHz to 175 MHz.
- Clock signal F PLL is also supplied to divider circuit 38 (see Fig. 2), where it is divided by any programmed one of the following integer parameters retrieved from programing network 42: 1 , 2, 4, 8, 16, 32, 64, 128 or 256, and then outputted as frequency F out through multiplexor 40 and output buffer 44.
- Phase detector 54, charge pump 56, loop filter 60 and VCO 58 are intended to represent a broad category of circuits utilized to phase lock two input signals, which are well known in the art and will not be described further.
- the output frequency F PLL and F ref satisfy the following equation:
- F PLL is a multiple of the loop frequency. Accordingly, for relatively low loop frequencies, F PLL can be finely adjusted in small increments of the loop frequency. If the loop frequency is too low, the phase locked loop can become unstable, resulting in jitter.
- an optimal loop frequency range is 32 KHz to 50 KHz, with a preferred range of 42.395 KHz to 43.059 KHz. Loop frequencies above this range, but less than 200 KHz, can also be used with output frequency resolution better than that obtainable by conventional crystal oscillator PLLs.
- phase locked loops used in digital circuit timing applications, however, operate at a significantly higher loop frequency, i.e., greater than 200 KHz. At these frequencies, such conventional crystal oscillators cannot achieve the same high frequency resolution attainable with the present invention.
- polysilicon capacitors for example, and other low noise components, are incorporated into the phase-locked loop typically used in the present invention so that it can operate with a loop frequency within the preferred range of 42.395 KHz to 43.059 KHz with relatively little jitter.
- the programmable crystal oscillator in accordance with the present invention can be used to generate an output frequency based on a wide range of crystal source frequencies.
- the output frequency is obtained by adjusting the source frequency with a programmable capacitive load, and operating the phase-locked loop circuit at a relatively low loop frequency.
- crystal oscillator output frequencies within 100 ppm or less of a specified target frequency can be achieved by simply storing appropriate P, Q, N and crystal pulling parameters in a PROM included in programming network 42.
- crystal oscillators 20 may be manufactured as generic programmable crystal oscillators, without regard to customer-specified output frequencies and simply programmed in a matter of seconds to generate output frequencies in accordance with customer specifications. Consequently, there is no need to manufacture the crystals to a plurality of standard frequencies, thus simplifying, expediting, and cost-reducing the manufacturing process. Leadtimes from customer purchase order to product delivery may thus be dramatically reduced.
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU60506/98A AU6050698A (en) | 1997-02-05 | 1998-02-03 | Programmable crystal oscillator |
JP53309598A JP2001510657A (en) | 1997-02-05 | 1998-02-03 | Programmable crystal oscillator |
BR9807549-7A BR9807549A (en) | 1997-02-05 | 1998-02-03 | Programmable crystal oscillator |
CA002278583A CA2278583A1 (en) | 1997-02-05 | 1998-02-03 | Programmable crystal oscillator |
DE69826244T DE69826244T2 (en) | 1997-02-05 | 1998-02-03 | PROGRAMMABLE CRYSTAL OSCILLATOR |
EP98903845A EP0958652B1 (en) | 1997-02-05 | 1998-02-03 | Programmable crystal oscillator |
HK00105344A HK1026079A1 (en) | 1997-02-05 | 2000-08-25 | Programmable crystal oscillator and method for usein programming crystal oscillator. |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/795,978 | 1997-02-05 | ||
US08/795,978 US5952890A (en) | 1997-02-05 | 1997-02-05 | Crystal oscillator programmable with frequency-defining parameters |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998034338A1 true WO1998034338A1 (en) | 1998-08-06 |
Family
ID=25166934
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US1998/001796 WO1998034338A1 (en) | 1997-02-05 | 1998-02-03 | Programmable crystal oscillator |
Country Status (15)
Country | Link |
---|---|
US (4) | US5952890A (en) |
EP (1) | EP0958652B1 (en) |
JP (1) | JP2001510657A (en) |
KR (1) | KR20000070691A (en) |
CN (1) | CN1191672C (en) |
AR (1) | AR011624A1 (en) |
AU (1) | AU6050698A (en) |
BR (1) | BR9807549A (en) |
CA (1) | CA2278583A1 (en) |
DE (1) | DE69826244T2 (en) |
HK (1) | HK1026079A1 (en) |
MY (1) | MY118540A (en) |
TW (1) | TW404095B (en) |
WO (1) | WO1998034338A1 (en) |
ZA (1) | ZA98866B (en) |
Cited By (1)
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GB2349995A (en) * | 1999-05-14 | 2000-11-15 | Ericsson Telefon Ab L M | An oscillator in which when the frequency is adjusted the level is also adjusted |
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Also Published As
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TW404095B (en) | 2000-09-01 |
US5952890A (en) | 1999-09-14 |
EP0958652A1 (en) | 1999-11-24 |
AU6050698A (en) | 1998-08-25 |
US6188290B1 (en) | 2001-02-13 |
US6954113B2 (en) | 2005-10-11 |
HK1026079A1 (en) | 2000-12-01 |
US6664860B2 (en) | 2003-12-16 |
BR9807549A (en) | 2000-02-15 |
AR011624A1 (en) | 2000-08-30 |
MY118540A (en) | 2004-12-31 |
EP0958652B1 (en) | 2004-09-15 |
ZA98866B (en) | 1998-08-05 |
CN1246219A (en) | 2000-03-01 |
CN1191672C (en) | 2005-03-02 |
KR20000070691A (en) | 2000-11-25 |
JP2001510657A (en) | 2001-07-31 |
CA2278583A1 (en) | 1998-08-06 |
DE69826244D1 (en) | 2004-10-21 |
US20030122630A1 (en) | 2003-07-03 |
DE69826244T2 (en) | 2005-11-17 |
US20010017573A1 (en) | 2001-08-30 |
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