Patent US3876934A successfully refreshed from Google Patents.
US3876934A
Expired / Lapsed
US
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Phase shifting circuit
Assignee: Sony Corp
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Filing: 1973-09-20
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Granted: 1975-04-08
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Expires: 1993-09-20
Abstract
Abstract In a phase shifting circuit particularly adapted to be formed as an integrated circuit, for example, for use in the chrominance channel of a color television receiver, the base-emitter resistance of a transistor and a capacitor form a series circuit receiving input signals of opposed polarity at its opposite ends, the collector-emitter path of the transistor is connected across a power supply source, and a variable constant current source is connected with the transistor''s emitter for controlling the emitter current and thereby varying the emitter internal resistance so that the phase of an output signal derived from the emitter is determined by the value of the constant current transmitted through the variable constant current source. The variable constant current source may be constituted by a second transistor through the collector-emitter path of which the emitter of the first mentioned transistor is connected to the respective side of the power supply source, and a source of a variable D.C. bias current to the base of the second transistor.
Inventors
- 👤 Takashi Okada
- 👤 Tsutomu Niimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:06
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/16; H03H11/20
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
156 words
A phase shifting circuit comprising: a transistor having a base, emitter and collector; a capacitor connected with said transistor so as to form a series circuit with the base-emitter resistance of said transistor; signal supplying means for supplying first and second input signals of opposed polarity to the opposite ends of said series circuit; a power supply source having a pair of voltage terminals; means connecting said collector of the transistor with one of said voltage terminals; variable constant current source means connecting said emitter of the transistor with the other of said voltage terminals for controlling the emitter current of said transistor and thereby varying the emitter internal resistance, and hence said base-emitter resistance of the transistor; and a signal output terminal connected to said emitter for deriving therefrom an output signal with the phase of the latter being determined by the value of the constant current transmitted by said variable constant current source means.
Claim 2
Dependent Claim
156 words
A phase shifting circuit comprising: a transistor having a base, emitter and collector; a capacitor connected with said transistor so as to form a series circuit with the base-emitter resistance of said transistor; signal supplying means for supplying first and second input signals of opposed polarity to the opposite ends of said series circuit; a power supply source having a pair of voltage terminals; means connecting said collector of the transistor with one of said voltage terminals; variable constant current source means connecting said emitter of the transistor with the other of said voltage terminals for controlling the emitter current of said transistor and thereby varying the emitter internal resistance, and hence said base-emitter resistance of the transistor; and a signal output terminal connected to said emitter for deriving therefrom an output signal with the phase of the latter being determined by the value of the constant current transmitted by said variable constant current source means.
Claim 3
Dependent Claim
88 words
A phase shifting circuit according to claim 1; in which said variable constant current source means includes a second transistor having a base, collector and emitter and being connected with the first mentioned transistor so that said emitter of said first transistor is connected to the said other voltage terminal of said power supply source through the collector-emitter path of said second transistor, and means for supplying a variable D.C. bias current to said base of said second transistor and thereby determining said value of the constant current.
Claim 4
Dependent Claim
95 words
A phase shifting circuit according to claim 2; in which said signal supplying means includes a third transistor having a base, collector and emitter, with said collector and emitter of said third transistor being respectively connected to said one voltage terminal and said other voltage terminal of said power supply source, a signal supply source for supplying said first input signal to the base of said third transistor and through said capacitor to said emitter of said first transistor, and means connecting the collector of said third transistor to said base of the first transistor.
Claim 5
Dependent Claim
121 words
A phase shifting circuit comprising: a transistor having base, emitter and collector electrodes; a power supply source having a pair of voltage terminals; signal supplying means for providing first and second input signals of opposed polarity; circuit means including a capacitor for applying said first input signal to said emitter electrode of the transistor through said capacitor; circuit means for applying said second input signal to said base electrode of the transistor; circuit means for connecting said collector electrode of the transistor to one of said voltage terminals; variable constant current source means connected between said emitter electrode of the transistor and the other of said voltage terminals; and a signal output terminal connected to said emitter electrode of the transistor.
Claim 6
Dependent Claim
121 words
A phase shifting circuit comprising: a transistor having base, emitter and collector electrodes; a power supply source having a pair of voltage terminals; signal supplying means for providing first and second input signals of opposed polarity; circuit means including a capacitor for applying said first input signal to said emitter electrode of the transistor through said capacitor; circuit means for applying said second input signal to said base electrode of the transistor; circuit means for connecting said collector electrode of the transistor to one of said voltage terminals; variable constant current source means connected between said emitter electrode of the transistor and the other of said voltage terminals; and a signal output terminal connected to said emitter electrode of the transistor.
Claim 7
Dependent Claim
68 words
A phase shifting circuit according to claim 4; in which said variable constant current source means includes a second transistor having base, emitter and collector electrodes with said emitter and collector electrodes of said second transistor being respectively connected to said other voltage terminal and to said emitter electrode of the first mentioned transistor, and variable D.C. voltage means connected to said base electrode of said second transistor.
Claim 8
Dependent Claim
31 words
A phase shifting circuit according to claim 5; in which at least said first and second transistors and said capacitor are formed as an integrated circuit on a single semiconductor chip.
Claim 9
Dependent Claim
104 words
A phase shifting circuit according to claim 5; in which said signal supplying means includes a signal source for supplying said first input signal, a third transistor functioning as a signal inverter and having base, emitter and collector electrodes, means connecting said signal source to said base electrode of the third transistor, and means connecting said collector and emitter electrodes of said third transistor with said voltage terminals, respectively, of the power supply source; and in which said circuit means for applying said second input signal to said base electrode of the first transistor is connected to said collector electrode of said third transistor.
Claim 10
Dependent Claim
48 words
A phase shifting circuit according to claim 5; in which said variable D.C. voltage means includes a variable resistor having a resistance element connected between said pair of voltage terminals and a movable tap, and means connecting said movable tap to said base electrode of the second transistor.
Claim 11
Dependent Claim
99 words
A phase shifting circuit according to claim 4; in which said signal supplying means includes a signal source for supplying said first input signal, another transistor functioning as a signal inverter and having base, emitter and collector electrodes, means connecting said signal source to the base electrode of said other transistor, and means connecting said collector and emitter electrodes of said other transistor with said voltage terminals, respectively; and in which said circuit means for applying said second input signal to said base electrode of the first mentioned transistor is connected to said collector electrode of said other transistor.
Claim 12
Dependent Claim
31 words
A phase shifting circuit according to claim 4; in which said variable constant current source means includes variable D.C. voltage means for determining the magnitude of the constant current transmitted therethrough.
References Cited (Backward Citations)
US2753519A
Cited
US3527964A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |