Patent US3840754A successfully refreshed from Google Patents.
US3840754A
Expired / Lapsed
US
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Phase comparing circuit
Assignee: Sony Corp
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Filing: 1973-04-04
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Granted: 1974-10-08
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Expires: 1993-04-04
Abstract
Abstract A phase comparing circuit in which four diodes constituting a bridge circuit which operates as a signal gate circuit and is supplied with an input signal to and delivers an output signal from a pair of opposite junctions of the bridge circuit. The signal gate circuit is controlled by a pair of constant current switching devices connected to another pair of junctions of the bridge circuit and the control switching devices are controlled by a control signal such that the absolute value of the output current is maintained constant regardless of the value of the input signal, and the output signal is obtained across a capacitor as a phase compared signal between the input signal and the control signal.
Inventors
- 👤 T Okada
- 👤 H Sumiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:48
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/74; H03D; H03D1/00; H03D1/22; H03D1/229; H03D13/00; H03D13/007; H03D3/00; H03D3/02; H03D3/06; H03D3/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
253 words
A phase comparing circuit, comprising: first and second circuit means each including a plurality of series connected diodes, the series connected diodes in each of the first and second circuit means having the same direction of conductive polarity; means for connecting the first and second circuit means in parallel; first and second constant current switching transistors for passing equal currents only when rendered conductive; a voltage supply source including a pair of terminals, means connecting the first switching transistor, the parallel connection of the first and second circuit means and the second switching transistor in a series circuit between said pair of terminals; control means including a control signal source for controlling the first and second switching transistors simultaneously so that the first and second switching transistors are selectively rendered conductive at the same time whereby substantially equal currents flow therethrough and current flows in said series circuit only at said time; means for supplying an input signal to a connection point between the series connected diodes in the first circuit means, the control signal supplied by the control signal source having a frequency corresponding to that of the input signal; an output terminal connected to a connection point between the series connected diodes in the second circuit means; and a capacitor connected between said output terminal and one of said voltage supply source terminals, so that an output signal representing the phase difference between said input and said control signals is derived from said output terminal as the charge across said capacitor.
Claim 2
Dependent Claim
253 words
A phase comparing circuit, comprising: first and second circuit means each including a plurality of series connected diodes, the series connected diodes in each of the first and second circuit means having the same direction of conductive polarity; means for connecting the first and second circuit means in parallel; first and second constant current switching transistors for passing equal currents only when rendered conductive; a voltage supply source including a pair of terminals, means connecting the first switching transistor, the parallel connection of the first and second circuit means and the second switching transistor in a series circuit between said pair of terminals; control means including a control signal source for controlling the first and second switching transistors simultaneously so that the first and second switching transistors are selectively rendered conductive at the same time whereby substantially equal currents flow therethrough and current flows in said series circuit only at said time; means for supplying an input signal to a connection point between the series connected diodes in the first circuit means, the control signal supplied by the control signal source having a frequency corresponding to that of the input signal; an output terminal connected to a connection point between the series connected diodes in the second circuit means; and a capacitor connected between said output terminal and one of said voltage supply source terminals, so that an output signal representing the phase difference between said input and said control signals is derived from said output terminal as the charge across said capacitor.
Claim 3
Dependent Claim
28 words
A phase comparing circuit as recited in claim 1, wherein resistive means are connected between the connection points of the diodes in said first and second circuit means.
Claim 4
Dependent Claim
49 words
A phase comparing circuit as recited in claim 1 wherein the first and second transistors have first, second and third electrodes respectively and the respective paths between the second and third electrodes are included in the series circuit and the first electrodes are simultaneously supplied with the control signal.
Claim 5
Dependent Claim
28 words
A phase comparing circuit as recited in claim 3 wherein the first, second and third electrodes are respectively the base, emitter and collector electrodes of the respective transistors.
Claim 6
Dependent Claim
63 words
A phase comparing circuit as recited in claim 4 wherein said control means further includes a third transistor having a base electrode for receiving the control signal, a collector electrode connected to the base electrode of one of said first and second switching transistors and an emitter electrode connected to the base electrode of the other of said first and second switching transistors.
Claim 7
Dependent Claim
49 words
A phase comparing circuit as recited in claim 1 wherein the first and second transistors have first, second and third electrodes respectively and the respective paths between the second and third electrodes are included in the series circuit and the second electrodes are simultaneously supplied with the control signal.
Claim 8
Dependent Claim
28 words
A phase comparing circuit as recited in claim 6 wherein the first, second and third electrodes are respectively the base, emitter and collector electrodes of the respective transistors.
Claim 9
Dependent Claim
63 words
A phase comparing circuit as recited in claim 7 wherein said control means further includes a third transistor having a base electrode for receiving the control signal, a collector electrode connected to the emitter electrode of one of said first and second switching transistors and an emitter electrode connected to the emitter electrode of the other of said first and second switching transistors.
Claim 10
Dependent Claim
19 words
A phase comparing circuit as recited in claim 1 wherein the first and second transistors are of opposite conductivity.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-07 | 1978-04-08 | 1978-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-07 | 1982-04-08 | 1982-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-07 | 1986-04-08 | 1986-10-08 | $7700.00 | Window Closed / Lapsed |