US3852678A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Push-pull amplifier with current mirrors for determining the quiescent operating point
Assignee: Individual
•
Filing: 1973-05-07
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Granted: 1974-12-03
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Expires: 1993-05-07
Abstract
Abstract A push-pull transistor amplifier includes two complementary common emitter output transistors with collectors connected together from which an output terminal is provided. The bases of these transistors are driven by complementary amplifiers in the form of current mirrors for quiescent operating point determination and as grounded base amplifiers for input signal injection. This arrangement realizes significant improvements in performance for crossover distortion, stable zero signal characteristics, gain bandwidth product and minimum number of circuit components.
Inventors
- 👤 G Frye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:59
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/30; H03F3/3066; H03F1/00; H03F1/32; H03F1/3217; H03F3/26
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
195 words
A push-pull amplifier circuit comprising: input signal means having input terminal means connected thereto for supplying input current signals to said input signal means, said input signal means including means for performing impedance transformation of said input current signals such that the input terminal means appears loaded by a low impedance, said transformation extending to zero frequency or DC; bias means coupled to said input signal means for generating a quiescent current; output means provided by said input signal means for supplying said input current signals in a non-inverted condition from a high impedance source of said input signal means, said high impedance source being derived from said impedance transformation means; output signal inverting means connected to said output means of said input signal means for receiving output signals from said input signal means, said output signal inverting means providing signal gain for amplifying said input current signals to provide amplified output current signals and also receiving said quiescent current from said input signal means for determining the quiescent operating point of said output signal means; and output terminal means connected to said output signal inverting means for receiving said amplified output current signals therefrom.
Claim 2
Dependent Claim
195 words
A push-pull amplifier circuit comprising: input signal means having input terminal means connected thereto for supplying input current signals to said input signal means, said input signal means including means for performing impedance transformation of said input current signals such that the input terminal means appears loaded by a low impedance, said transformation extending to zero frequency or DC; bias means coupled to said input signal means for generating a quiescent current; output means provided by said input signal means for supplying said input current signals in a non-inverted condition from a high impedance source of said input signal means, said high impedance source being derived from said impedance transformation means; output signal inverting means connected to said output means of said input signal means for receiving output signals from said input signal means, said output signal inverting means providing signal gain for amplifying said input current signals to provide amplified output current signals and also receiving said quiescent current from said input signal means for determining the quiescent operating point of said output signal means; and output terminal means connected to said output signal inverting means for receiving said amplified output current signals therefrom.
Claim 3
Dependent Claim
32 words
An amplifier circuit according to claim 1 wherein said input signal means comprises complementary transistor means having emitter means thereof connected together and said input terminal means connected to said emitter means.
Claim 4
Dependent Claim
34 words
An amplifier circuit according to claim 2 wherein said bias means define other complementary transistor means having base means connected to base means of said first-mentioned complementary transistor means defining idling current set diodes.
Claim 5
Dependent Claim
27 words
An amplifier circuit according to claim 3 wherein said first-mentioned complementary transistor means and said other complementary transistor means define current mirrors for quiescent operating point determination.
Claim 6
Dependent Claim
33 words
An amplifier circuit according to claim 1 wherein said output signal inverting means comprises complementary transistor means having collector means thereof connected together and said output terminal means connected to said collector means.
Claim 7
Dependent Claim
23 words
An amplifier circuit according to claim 1 wherein Feedback circuit means is connected between said output terminal means and said input terminal means.
Claim 8
Dependent Claim
127 words
A push-pull amplifier comprising: a first pair of complementary transistors having connection means employed between their emitters; input terminal means connected to said connection means between said emitters of said first pair of complementary transistors; a second pair of complementary transistors having their bases connected respectively to the bases of said first pair of complementary transistors for operating said first pair of transistors as grounded base amplifiers and for setting the quiescent current of said first pair of complementary transistors; a third pair of complementary transistors having connection means between their collectors and connection means between their bases and the respective collectors of said first pair of transistors; and output terminal means connected to said connection means between said collectors of said third pair of complementary transistors.
Claim 9
Dependent Claim
127 words
A push-pull amplifier comprising: a first pair of complementary transistors having connection means employed between their emitters; input terminal means connected to said connection means between said emitters of said first pair of complementary transistors; a second pair of complementary transistors having their bases connected respectively to the bases of said first pair of complementary transistors for operating said first pair of transistors as grounded base amplifiers and for setting the quiescent current of said first pair of complementary transistors; a third pair of complementary transistors having connection means between their collectors and connection means between their bases and the respective collectors of said first pair of transistors; and output terminal means connected to said connection means between said collectors of said third pair of complementary transistors.
Claim 10
Dependent Claim
17 words
A push-pull amplifier according to claim 7 wherein said second pair of transistors define idling current diodes.
Claim 11
Dependent Claim
29 words
A push-pull amplifier according to claim 7 wherein said first pair of complementary transistors and said second pair of complementary transistors define current mirrors for quiescent operating point determination.
Claim 12
Dependent Claim
23 words
A push-pull amplifier according to claim 7 wherein feedback circuit means is connected between said output terminal means and said input terminal means.
References Cited (Backward Citations)
US3319175A
Cited
US3559086A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-02 | 1978-06-03 | 1978-12-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-02 | 1982-06-03 | 1982-12-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-02 | 1986-06-03 | 1986-12-03 | $7700.00 | Window Closed / Lapsed |