US4384261A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Class A complementary single-ended push-pull amplifier
Assignee: Nippon Gakki Co Ltd
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Filing: 1981-07-01
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Granted: 1983-05-17
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Expires: 2001-07-01
Abstract
Abstract In a complementary single-ended push-pull amplifier in which emitters of first and second complementary bipolar output transistors are connected through first and second emitter resistors to a load such as a loudspeaker, third and fourth complementary bipolar transistors are connected in series between the bases of the first and second bipolar transistors having their emitters connected to a bias voltage source for operating the first and second output transistors in the Class A mode. The bases of third and fourth transistors are respectively connected to the emitters of the first and second transistors, whereby a negative feedback is provided from the emitters of the first and second transistors to the bases thereof. With this arrangement, the sum of the collector currents of the first and second transistors is kept substantially constant and hence distortion of an output current (difference between the collector currents of the output transistors) fed to the load at large signal levels can be improved.
Inventors
- 👤 Kenji Yokoyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:09
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/32; H03F1/3217
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
175 words
A complementary single-ended push-pull amplifier comprising: first and second complementary bipolar transistor means; first and second emitter resistors connected in series between emitters of said first and second complementary bipolar transistor means, a connection point between said emitter resistors being adapted for connection to a load; third and fourth complementary bipolar transistors connected in series between bases of said first and second transistor means and having their bases connected to the emitters of said first and second transistors, respectively; a constant voltage circuit connected between the emitters of said third and fourth transistors to operate said first and second transistor means in the Class A mode; said third and fourth transistors comparing a voltage across said first and second emitter resistors with a voltage of said constant voltage circuit; and collector currents of said third and fourth transistors controlling base biases of said first and second transistor means, to thereby operate said first and second transistor means so that a sum of collector currents of said first and second transistor means is kept substantially constant.
Claim 2
Dependent Claim
175 words
A complementary single-ended push-pull amplifier comprising: first and second complementary bipolar transistor means; first and second emitter resistors connected in series between emitters of said first and second complementary bipolar transistor means, a connection point between said emitter resistors being adapted for connection to a load; third and fourth complementary bipolar transistors connected in series between bases of said first and second transistor means and having their bases connected to the emitters of said first and second transistors, respectively; a constant voltage circuit connected between the emitters of said third and fourth transistors to operate said first and second transistor means in the Class A mode; said third and fourth transistors comparing a voltage across said first and second emitter resistors with a voltage of said constant voltage circuit; and collector currents of said third and fourth transistors controlling base biases of said first and second transistor means, to thereby operate said first and second transistor means so that a sum of collector currents of said first and second transistor means is kept substantially constant.
Claim 3
Dependent Claim
47 words
A complementary single-ended push-pull amplifier according to claim 1, further comprising: driver stage circuit means for driving said first and second transistor means; and said driver stage circuit means being comprised of a complementary push-pull amplifying circuit driving the bases of said first and second transistor means.
Claim 4
Dependent Claim
41 words
A complementary single-ended push-pull amplifier according to claim 1, further comprising: driver stage circuit means for driving said first and second transistor means; and said driver stage circuit means being comprised of a differential amplifying circuit having a current mirror load.
Claim 5
Dependent Claim
43 words
A complementary single-ended push-pull amplifier according to claim 1, further comprising driver stage circuit means for driving said first and second transistor means having constant current load means whose current value is controlled by said collector currents of said third and fourth transistors.
Claim 6
Dependent Claim
47 words
A complementary single-ended push-pull amplifier according to claim 4, further comprising: driver stage circuit means for driving said first and second transistor means; and said driver stage circuit means being comprised of a complementary push-pull amplifying circuit driving the bases of said first and second transistor means.
Claim 7
Dependent Claim
68 words
A complementary single-ended push-pull amplifier according to claim 5, further comprising: fifth and sixth complementary bipolar transistors having respective bases connected to the emitters of said third and fourth transistors, respective emitters connected to each other by said constant voltage circuit, and respective collectors connected to said constant current load means; and a resistor and a capacitor each connected between the bases of said fifth and sixth transistors.
Claim 8
Dependent Claim
28 words
A complementary single-ended push-pull amplifier according to any one of claims 1 to 6, wherein said first and second transistor means are comprised of Darlington-connected transistor pairs, respectively.
References Cited (Backward Citations)
US3536958A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-16 | 1986-11-15 | 1987-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-16 | 1990-11-15 | 1991-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-16 | 1994-11-15 | 1995-05-17 | $7700.00 | Window Closed / Lapsed |