US3673430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cos/mos phase comparator for monolithic integration
Assignee: United States Department of the Air Force
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Filing: 1971-08-23
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Granted: 1972-06-27
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Expires: 1991-08-23
Abstract
Abstract A phase comparator integrated circuit apparatus for comparing a pair of AC signals and providing a substantially pure DC output. The phase converter utilizes the time difference between pulses from two different input signals to provide a DC voltage which is free from AC ripple.
Inventors
- 👤 William J Donoghue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:35
CPC Classifications
H; H03; H03D; H03D13/00; H03D13/005; H03D13/006
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
215 words
An integrated circuit phase comparator apparatus for comparing a pair of AC signals and producing a DC output voltage comprising in combination: a ramp generator to provide a ramp output voltage, said ramp generator receiving a first AC signal, said ramp generator generating said ramp output voltage in response to said first AC signal, a sample and hold circuit to receive said ramp output voltage, said sample and hold circuit utilizing a second AC signal to sample said ramp output voltage, said sampled output voltage being stored in a first capacitor, said sampled output voltage being sampled by the complement of said second AC signal, said doubly sampled output voltage being stored in a second capacitor, a feedback circuit to receive said ramp output voltage from said sample and hold circuit, said feedback circuit degeneratively feeding back a portion of said ramp output voltage to said sample and hold circuit, an output amplifier unit receiving said output voltage from said second capacitor, said output amplifier unit amplifying said output voltage to provide a DC output voltage signal, a bias ramp generator regulator to provide threshold voltage regulation to said ramp generator, and, a bias output regulator to provide threshold voltage regulation to said output amplifier unit, said bias ramp generator regulator and said ramp generator.
Claim 2
Dependent Claim
215 words
An integrated circuit phase comparator apparatus for comparing a pair of AC signals and producing a DC output voltage comprising in combination: a ramp generator to provide a ramp output voltage, said ramp generator receiving a first AC signal, said ramp generator generating said ramp output voltage in response to said first AC signal, a sample and hold circuit to receive said ramp output voltage, said sample and hold circuit utilizing a second AC signal to sample said ramp output voltage, said sampled output voltage being stored in a first capacitor, said sampled output voltage being sampled by the complement of said second AC signal, said doubly sampled output voltage being stored in a second capacitor, a feedback circuit to receive said ramp output voltage from said sample and hold circuit, said feedback circuit degeneratively feeding back a portion of said ramp output voltage to said sample and hold circuit, an output amplifier unit receiving said output voltage from said second capacitor, said output amplifier unit amplifying said output voltage to provide a DC output voltage signal, a bias ramp generator regulator to provide threshold voltage regulation to said ramp generator, and, a bias output regulator to provide threshold voltage regulation to said output amplifier unit, said bias ramp generator regulator and said ramp generator.
Claim 3
Dependent Claim
75 words
An integrated circuit phase comparator apparatus as described in claim 1 wherein said ramp generator comprises: a unity gain amplifier to provide a constant voltage across a resistor by positive feedback through said unity gain amplifier, said constant voltage across said resistor provide a constant current, said constant current charges a third capacitor, said third capacitor is discharged to ground by said first AC signal through an N-channel device to provide said ramp output voltage.
Claim 4
Dependent Claim
148 words
An integrated circuit phase comparator apparatus as described in claim 1 wherein said sample and hold circuit comprises: a first source follower circuit which comprises: a pair of P-channel devices connected in series between ground and +12 volts supply, a N-channel device connected in parallel with a P-channel device to receive said ramp output voltage from said P-channel device pair, said N-channel device receiving said second AC signal and said P-channel device receiving said second AC signal complement to charge said first capacitor, and a second source follower circuit which comprises: a pair of P-channel devices connected in series between ground and +12 volts supply, a N-channel device connected in parallel with a P-channel device to receive said sampled output voltage from said first capacitor, said N-channel device receiving said second AC signal complement and said P-channel device receiving said second AC signal to charge said second capacitor.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |