Patent US2201098A successfully refreshed from Google Patents.
Patent US3663836A successfully refreshed from Google Patents.
US3663836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase shifter for ultrahigh frequencies
Assignee: Westinghouse Electric Corp
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Filing: 1970-06-09
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Granted: 1972-05-16
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Expires: 1990-06-09
Abstract
Abstract A circuit is described for obtaining a controllable phase shift with very little amplitude variation at ultrahigh frequencies, the circuit being entirely solid state and readily integrated. This is achieved by a shunt-series feedback pair of transistors wherein the output of a first transistor is applied through a second emitter follower transistor and a feedback path to the base of the first transistor, together with a variable capacitance diode connected in shunt with the collector-base junction of the first transistor.
Inventors
- 👤 Rafael Fernandez-Sein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:49
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/16; H03H11/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
162 words
A phase shifter comprising a first transistor having an emitter, a collector and a base, a second transistor having an emitter, a collector and a base, means connecting the collectors of said transistors to a source of driving potential, means connecting the emitters of said transistors to a point of reference potential, a connection between the collector of said first transistor and the base of said second transistor, a connection between the emitter of said second transistor and the base of said first transistor, a variable source of potential connected between the base and emitter of said first transistor, and means including said variable source of potential for causing the collector-to-base capacitance of said first transistor to decrease as the transconductance of said first transistor increases whereby variation in said variable source of potential will cause the phase of the signal on the collector of said first transistor to vary with essentially no variation in amplitude of the signal at said collector.
Claim 2
Dependent Claim
162 words
A phase shifter comprising a first transistor having an emitter, a collector and a base, a second transistor having an emitter, a collector and a base, means connecting the collectors of said transistors to a source of driving potential, means connecting the emitters of said transistors to a point of reference potential, a connection between the collector of said first transistor and the base of said second transistor, a connection between the emitter of said second transistor and the base of said first transistor, a variable source of potential connected between the base and emitter of said first transistor, and means including said variable source of potential for causing the collector-to-base capacitance of said first transistor to decrease as the transconductance of said first transistor increases whereby variation in said variable source of potential will cause the phase of the signal on the collector of said first transistor to vary with essentially no variation in amplitude of the signal at said collector.
Claim 3
Dependent Claim
43 words
The phase shifter of claim 1 wherein said means for causing the collector-to-base capacitance of said first transistor to decrease as the transconductance of said first transistor increases comprises a variable capacitance diode connected between the base and collector of said first transistor.
Claim 4
Dependent Claim
30 words
The phase shifter of claim 1 wherein said variable source of potential is varied about a nominal value which is just above the cut off potential of said first transistor.
Claim 5
Dependent Claim
31 words
The phase shifter of claim 1 wherein said transistors are of the NPN type and said source of variable potential is negative as applied to the base of said first transistor.
Claim 6
Dependent Claim
27 words
The phase shifter of claim 1 wherein the emitter of said second transistor is connected to said point of reference potential through a resistor and a capacitor.
References Cited (Backward Citations)
US3527964A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |