US3886464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-biased complementary transistor amplifier
Assignee: RCA Corp
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Filing: 1973-06-01
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Granted: 1975-05-27
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Expires: 1993-06-01
Abstract
Abstract A complementary symmetry field-effect transistor amplifier employs a feedback path between the input and output terminals thereof. A second pair of complementary symmetry field-effect transistors in series with the transistors of the amplifier is employed to control the operating potentials applied to the amplifier. In one form of the circuit, the signal employed for controlling the conductance of the second pair of transistors is the output signal of the amplifier.
Inventors
- 👤 Andrew Francis Gordon Dingwall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:24
CPC Classifications
H; H03; H03G; H03G1/00; H03G1/0005; H03G1/0035; H03G1/007; H03F; H03F1/00; H03F1/34; H03G3/00; H03G3/20; H03G3/30; H03G3/3005; H03G3/301; H03G3/3015
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
156 words
In combination: a complementary field-effect transistor amplifier having an input terminal for receiving an input signal, first and second operating potential terminals for receiving first and second operating potentials, respectively, and an output terminal for producing an output signal; first and second circuit points for receiving first and second fixed potentials, respectively; a control voltage input terminal for receiving a control voltage; a first variable impedance element having a conduction path connected between said first circuit point and said first operating potential terminal and having an impedance controlling electrode direct current conductively coupled to said control voltage input terminal; a second variable impedance element having a conduction path connected between said second circuit point and said second operating potential terminal and having an impedance controlling electrode direct current conductively coupled to said control voltage input terminal; and feedback means coupling said output terminal to said input terminal for establishing said amplifier in a quiescent operating condition.
Claim 2
Dependent Claim
156 words
In combination: a complementary field-effect transistor amplifier having an input terminal for receiving an input signal, first and second operating potential terminals for receiving first and second operating potentials, respectively, and an output terminal for producing an output signal; first and second circuit points for receiving first and second fixed potentials, respectively; a control voltage input terminal for receiving a control voltage; a first variable impedance element having a conduction path connected between said first circuit point and said first operating potential terminal and having an impedance controlling electrode direct current conductively coupled to said control voltage input terminal; a second variable impedance element having a conduction path connected between said second circuit point and said second operating potential terminal and having an impedance controlling electrode direct current conductively coupled to said control voltage input terminal; and feedback means coupling said output terminal to said input terminal for establishing said amplifier in a quiescent operating condition.
Claim 3
Dependent Claim
100 words
The combination recited in claim 1 wherein said complementary field-effect transistor amplifier comprises: a first field effect transistor having a conduction path of a first conductivity type coupled between said first operating potential terminal and said output terminal, and having a control electrode for controlling the conduction of the path; a second field-effect transistor having a conduction path of a second conductivity type coupled between said second operating potential terminal and said output terminal and also having a control electrode for controlling the conduction of the path; and means coupling the control electrodes of each transistor to said input terminal.
Claim 4
Dependent Claim
92 words
The combination recited in claim 2 wherein said first and second variable impedance elements comprise, respectively, third and fourth complementary field-effect transistors, the third transistor connected at its source electrode to said first circuit point and at its drain electrode to said first operating potential terminal, the fourth transistor connected at its source electrode to said second circuit point and at its drain electrode to said second operating potential terminal, and the gate electrodes of said third and fourth transistors coupled in common to said control terminal, for receiving said control voltage.
Claim 5
Dependent Claim
37 words
The combination recited in claim 3 further comprising: means coupling said output terminal to said control terminal for providing a feedback path for signals present on said output terminal to said third and fourth complementary fieldeffect transistors.
Claim 6
Dependent Claim
31 words
The combination recited in claim 3 wherein said feedback means comprises a resistor, one end thereof coupled to said output terminal and the other end thereof coupled to said input terminal.
Claim 7
Dependent Claim
36 words
The combination recited in claim 3 wherein said feedback means comprises low-pass filter means having an input terminal thereof coupled to the amplifier output terminal and having an output terminal coupled to the amplifier input terminal.
Claim 8
Dependent Claim
20 words
The combination recited in claim 6 wherein said low-pass filter includes at least one capacitor and at least one resistor.
Claim 9
Dependent Claim
43 words
The combination recited in claim 3 fuRther comprising: a circuit point for initially receiving said input signal; and a capacitor coupled between said circuit point and said input terminal for conducting solely alternating current components of said input signal to said input terminal.
Claim 10
Dependent Claim
151 words
In combination: first and second complementary-symmetry field-effect transistor amplifiers, each amplifier having first and second terminals for receiving first and second operating potentials, respectively, an input terminal for receiving an input signal and an output terminal adapted to produce an output signal representative both of said input signal and said operating potentials; means in each amplifier for self-biasing the amplifier to a substantially linear operating condition; first and second circuit points for receiving first and second fixed potentials, respectively; control circuit means including a first pair of variable impedance elements, each element connected between a respective one of said first terminals and said first circuit point and a second pair of variable impedance elements, each connected between a respective one of said second terminals and said second circuit point, each element of each pair having an impedance controlling electrode direct current conductively coupled to a selected one of said output terminals.
Claim 11
Dependent Claim
151 words
In combination: first and second complementary-symmetry field-effect transistor amplifiers, each amplifier having first and second terminals for receiving first and second operating potentials, respectively, an input terminal for receiving an input signal and an output terminal adapted to produce an output signal representative both of said input signal and said operating potentials; means in each amplifier for self-biasing the amplifier to a substantially linear operating condition; first and second circuit points for receiving first and second fixed potentials, respectively; control circuit means including a first pair of variable impedance elements, each element connected between a respective one of said first terminals and said first circuit point and a second pair of variable impedance elements, each connected between a respective one of said second terminals and said second circuit point, each element of each pair having an impedance controlling electrode direct current conductively coupled to a selected one of said output terminals.
Claim 12
Dependent Claim
129 words
The combination recited in claim 9 wherein: said first pair of variable impedance elements comprises a first pair of field effect transistors of a first conductivity type, the source electrode of each being connected to said first circuit point and the drain electrode of each being connected to a different one of said first terminals; wherein said second pair of variable impedance elements comprises a second pair of field effect transistors of a second conductivity type, the source electrode of each being connected to said second circuit point, and the drain electrode of each being connected to a different one of said second terminals; and wherein said the gate electrode of each transistor of each said pair of transistors is connected to said selected one of said output terminals.
Claim 13
Dependent Claim
145 words
The combination recited in claim 9 wherein: said first amplifier comprises one pair of complementary field-effect transistors, each transistor thereof having a conduction path and a control electrode for controlling the conduction of the path, the conduction paths connected in series between said first and second terminals of said first amplifier with the midpoint of the series coupled to said first amplifier output terminal and the control electrodes coupled to said first amplifier input terminal; and wherein said second amplifier comprises another pair of complementary field-effect transistors, each transistor thereof having a conduction path and a control electrode for controlling the conduction of the path, the conduction paths connected in series between said first and second terminals of said second amplifier with the midpoint of the series coupled to said second amplifier output terminal and the control electrodes coupled to said second amplifier input terminal.
Claim 14
Dependent Claim
55 words
The combination recited in claim 11 wherein said means in each amplifier for self biasing the amplifier to a substantially linear operating condition comprises: first feedback means in said first amplifier coupled between the input and output terminals thereof; and second feedback means in said second amplifier coupled between the input and output terminals thereof.
Claim 15
Dependent Claim
19 words
The combination recited in claim 11 wherein said first and second feedback means comprise first and second resistors, respectively.
References Cited (Backward Citations)
US3392341A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |