WO1998051071A3 - Current source and threshold voltage generation method and apparatus to be used in a circuit for removing the equalization pulses in a composite video synchronization signal - Google Patents

Current source and threshold voltage generation method and apparatus to be used in a circuit for removing the equalization pulses in a composite video synchronization signal Download PDF

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Publication number
WO1998051071A3
WO1998051071A3 PCT/US1998/008869 US9808869W WO9851071A3 WO 1998051071 A3 WO1998051071 A3 WO 1998051071A3 US 9808869 W US9808869 W US 9808869W WO 9851071 A3 WO9851071 A3 WO 9851071A3
Authority
WO
WIPO (PCT)
Prior art keywords
threshold voltage
circuit
current
voltage signal
timing
Prior art date
Application number
PCT/US1998/008869
Other languages
French (fr)
Other versions
WO1998051071A2 (en
Inventor
Mehrdad Nayebi
Duc Ngo
Original Assignee
Sony Electronics Inc
Mehrdad Nayebi
Duc Ngo
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US08/853,046 external-priority patent/US6028640A/en
Priority claimed from US08/848,387 external-priority patent/US6018370A/en
Application filed by Sony Electronics Inc, Mehrdad Nayebi, Duc Ngo filed Critical Sony Electronics Inc
Priority to AU72762/98A priority Critical patent/AU7276298A/en
Publication of WO1998051071A2 publication Critical patent/WO1998051071A2/en
Publication of WO1998051071A3 publication Critical patent/WO1998051071A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/08—Separation of synchronising signals from picture signals
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices

Abstract

A current source and threshold voltage generation circuit generates a current, through a ratio of devices, and a corresponding threshold voltage signal, to be utilized by a timing circuit for generating a timing ramp and determining when the timing ramp crosses the threshold voltage signal. The current is generated through a current generation circuit, using a ratio of matched devices. Preferably, the matched devices are transistors. The current is then utilized by a timing circuit to charge a charge storage device to a level above the level of the threshold voltage signal. The current is also mirrored, appropriately increased and used to generate the threshold voltage signal which is compared to the charge stored on the charge storage device. Accordingly, any errors in the generation of the current are also reflected in the level of the threshold voltage signal, thereby eliminating the potential for errors in the timing ramp signal generated by the timing circuit. Preferably, the charge storage device (C1) is a capacitor and the timimg circuit is an HHK video circuit. The preferred embodiment of the current source and threshold voltage generation circuit is implemented within an integrated circuit and does not require any external components.
PCT/US1998/008869 1997-05-08 1998-05-01 Current source and threshold voltage generation method and apparatus to be used in a circuit for removing the equalization pulses in a composite video synchronization signal WO1998051071A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU72762/98A AU7276298A (en) 1997-05-08 1998-05-01 Current source and threshold voltage generation method and apparatus for hhk video circuit

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US08/853,046 1997-05-08
US08/853,046 US6028640A (en) 1997-05-08 1997-05-08 Current source and threshold voltage generation method and apparatus for HHK video circuit
US08/848,387 1997-05-08
US08/848,387 US6018370A (en) 1997-05-08 1997-05-08 Current source and threshold voltage generation method and apparatus for HHK video circuit

Publications (2)

Publication Number Publication Date
WO1998051071A2 WO1998051071A2 (en) 1998-11-12
WO1998051071A3 true WO1998051071A3 (en) 1999-02-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/008869 WO1998051071A2 (en) 1997-05-08 1998-05-01 Current source and threshold voltage generation method and apparatus to be used in a circuit for removing the equalization pulses in a composite video synchronization signal

Country Status (3)

Country Link
AU (1) AU7276298A (en)
TW (1) TW385611B (en)
WO (1) WO1998051071A2 (en)

Citations (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3883756A (en) * 1973-12-27 1975-05-13 Burroughs Corp Pulse generator with automatic timing adjustment for constant duty cycle
US3898377A (en) * 1973-11-23 1975-08-05 Xerox Corp Video mixer
US4166250A (en) * 1976-10-19 1979-08-28 Matsushita Electric Industrial Co., Ltd. Synchronizing signal processing circuit
US4282549A (en) * 1979-12-11 1981-08-04 Rca Corporation Pulse generator for a horizontal deflection system
US4292654A (en) * 1979-12-20 1981-09-29 Rca Corporation Deflection system and switched-mode power supply using a common ramp generator
US4364091A (en) * 1981-02-18 1982-12-14 Tokyo Shibaura Denki Kabushiki Kaisha Equalizing pulse removal circuit
US4467289A (en) * 1979-11-05 1984-08-21 Sony Corporation Current mirror circuit
US4567444A (en) * 1983-05-26 1986-01-28 Sony Corporation Current mirror circuit with control means for establishing an input-output current ratio
US4594565A (en) * 1984-08-30 1986-06-10 Cordis Corporation Clock oscillator for a cardiac pacer having frequency compensation for temperature and voltage fluctuations
US4677368A (en) * 1986-10-06 1987-06-30 Motorola, Inc. Precision thermal current source
US4689549A (en) * 1986-06-30 1987-08-25 Motorola, Inc. Monolithic current splitter for providing temperature independent current ratios
US4827341A (en) * 1986-12-16 1989-05-02 Fuji Photo Equipment Co., Ltd. Synchronizing signal generating circuit
US5059820A (en) * 1990-09-19 1991-10-22 Motorola, Inc. Switched capacitor bandgap reference circuit having a time multiplexed bipolar transistor
US5070311A (en) * 1989-07-07 1991-12-03 Sgs-Thomson Microelectronics Sa Integrated circuit with adjustable oscillator with frequency independent of the supply voltage
EP0465094A2 (en) * 1990-07-02 1992-01-08 Motorola, Inc. Bandgap voltage reference using a power supply independent current source
US5124632A (en) * 1991-07-01 1992-06-23 Motorola, Inc. Low-voltage precision current generator
US5189515A (en) * 1991-02-04 1993-02-23 Industrial Technology Research Institute Television synchronization signal separator
US5250879A (en) * 1992-03-02 1993-10-05 Thomson Consumer Electronics, S.A. Deflection circuit having a controllable sawtooth generator
US5349286A (en) * 1993-06-18 1994-09-20 Texas Instruments Incorporated Compensation for low gain bipolar transistors in voltage and current reference circuits
US5394020A (en) * 1992-12-30 1995-02-28 Zenith Electronics Corporation Vertical ramp automatic amplitude control
US5428287A (en) * 1992-06-16 1995-06-27 Cherry Semiconductor Corporation Thermally matched current limit circuit
US5469093A (en) * 1993-11-03 1995-11-21 Plessey Semiconductors Limited Current mirror drive circuit with high breakdown voltage
US5473243A (en) * 1993-01-27 1995-12-05 Siemens Aktiengesellschaft Integratable current source circuit for generating an output current proportional to an input current
US5479091A (en) * 1992-12-11 1995-12-26 Texas Instruments Incorporated Output current reference circuit and method
EP0698841A1 (en) * 1994-08-26 1996-02-28 STMicroelectronics Limited Current generator circuit
EP0735677A1 (en) * 1995-03-31 1996-10-02 Co.Ri.M.Me. Consorzio Per La Ricerca Sulla Microelettronica Nel Mezzogiorno Oscillator circuit having oscillation frequency independent from the supply voltage value
US5565915A (en) * 1993-06-15 1996-10-15 Matsushita Electric Industrial Co., Ltd. Solid-state image taking apparatus including photodiode and circuit for converting output signal of the photodiode into signal which varies with time at variation rate depending on intensity of light applied to the photodiode
US5570243A (en) * 1993-06-22 1996-10-29 Fujitsu Limited Variable delay circuit including current mirror and ramp generator circuits for use in the read channel of a data storage device
US5604427A (en) * 1994-10-24 1997-02-18 Nec Corporation Current reference circuit using PTAT and inverse PTAT subcircuits

Patent Citations (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3898377A (en) * 1973-11-23 1975-08-05 Xerox Corp Video mixer
US3883756A (en) * 1973-12-27 1975-05-13 Burroughs Corp Pulse generator with automatic timing adjustment for constant duty cycle
US4166250A (en) * 1976-10-19 1979-08-28 Matsushita Electric Industrial Co., Ltd. Synchronizing signal processing circuit
US4467289A (en) * 1979-11-05 1984-08-21 Sony Corporation Current mirror circuit
US4282549A (en) * 1979-12-11 1981-08-04 Rca Corporation Pulse generator for a horizontal deflection system
US4292654A (en) * 1979-12-20 1981-09-29 Rca Corporation Deflection system and switched-mode power supply using a common ramp generator
US4364091A (en) * 1981-02-18 1982-12-14 Tokyo Shibaura Denki Kabushiki Kaisha Equalizing pulse removal circuit
US4567444A (en) * 1983-05-26 1986-01-28 Sony Corporation Current mirror circuit with control means for establishing an input-output current ratio
US4594565A (en) * 1984-08-30 1986-06-10 Cordis Corporation Clock oscillator for a cardiac pacer having frequency compensation for temperature and voltage fluctuations
US4689549A (en) * 1986-06-30 1987-08-25 Motorola, Inc. Monolithic current splitter for providing temperature independent current ratios
US4677368A (en) * 1986-10-06 1987-06-30 Motorola, Inc. Precision thermal current source
US4827341A (en) * 1986-12-16 1989-05-02 Fuji Photo Equipment Co., Ltd. Synchronizing signal generating circuit
US5070311A (en) * 1989-07-07 1991-12-03 Sgs-Thomson Microelectronics Sa Integrated circuit with adjustable oscillator with frequency independent of the supply voltage
EP0465094A2 (en) * 1990-07-02 1992-01-08 Motorola, Inc. Bandgap voltage reference using a power supply independent current source
US5059820A (en) * 1990-09-19 1991-10-22 Motorola, Inc. Switched capacitor bandgap reference circuit having a time multiplexed bipolar transistor
US5189515A (en) * 1991-02-04 1993-02-23 Industrial Technology Research Institute Television synchronization signal separator
US5124632A (en) * 1991-07-01 1992-06-23 Motorola, Inc. Low-voltage precision current generator
US5250879A (en) * 1992-03-02 1993-10-05 Thomson Consumer Electronics, S.A. Deflection circuit having a controllable sawtooth generator
US5428287A (en) * 1992-06-16 1995-06-27 Cherry Semiconductor Corporation Thermally matched current limit circuit
US5479091A (en) * 1992-12-11 1995-12-26 Texas Instruments Incorporated Output current reference circuit and method
US5394020A (en) * 1992-12-30 1995-02-28 Zenith Electronics Corporation Vertical ramp automatic amplitude control
US5473243A (en) * 1993-01-27 1995-12-05 Siemens Aktiengesellschaft Integratable current source circuit for generating an output current proportional to an input current
US5565915A (en) * 1993-06-15 1996-10-15 Matsushita Electric Industrial Co., Ltd. Solid-state image taking apparatus including photodiode and circuit for converting output signal of the photodiode into signal which varies with time at variation rate depending on intensity of light applied to the photodiode
US5349286A (en) * 1993-06-18 1994-09-20 Texas Instruments Incorporated Compensation for low gain bipolar transistors in voltage and current reference circuits
US5570243A (en) * 1993-06-22 1996-10-29 Fujitsu Limited Variable delay circuit including current mirror and ramp generator circuits for use in the read channel of a data storage device
US5469093A (en) * 1993-11-03 1995-11-21 Plessey Semiconductors Limited Current mirror drive circuit with high breakdown voltage
EP0698841A1 (en) * 1994-08-26 1996-02-28 STMicroelectronics Limited Current generator circuit
US5604427A (en) * 1994-10-24 1997-02-18 Nec Corporation Current reference circuit using PTAT and inverse PTAT subcircuits
EP0735677A1 (en) * 1995-03-31 1996-10-02 Co.Ri.M.Me. Consorzio Per La Ricerca Sulla Microelettronica Nel Mezzogiorno Oscillator circuit having oscillation frequency independent from the supply voltage value

Also Published As

Publication number Publication date
AU7276298A (en) 1998-11-27
WO1998051071A2 (en) 1998-11-12
TW385611B (en) 2000-03-21

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