Patent US3899744A successfully refreshed from Google Patents.
US3899744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor amplifier circuit
Assignee: Hitachi Ltd
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Filing: 1974-02-07
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Granted: 1975-08-12
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Expires: 1994-02-07
Abstract
Abstract In a transistor amplifier circuit having an amplifier transistor, a collector load resistance and an emitter resistance, a constant-current absorbing circuit is connected in parallel with the emitter resistance, and/or a constant current pressing-out circuit is connected in parallel with the collector load resistance, so that the distortion factor of the transistor amplifier circuit is lowered without spoiling the input dynamic range, the low supply voltage operation or the voltage amplification factor thereof.
Inventors
- 👤 Yasuo Kominami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:54
CPC Classifications
H; H04; H04H; H04H40/00; H04H40/18; H04H40/27; H04H40/36; H04H40/45; H03; H03F; H03F1/00; H03F1/32; H03F1/3211; H03F3/00; H03F3/45; H03F3/45071; H03F3/45076; H03F3/45179; H03F3/45197; H04H40/72
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
325 words
A transistor amplifier circuit comprising: first to sixth transistors, each having an emitter, a base and a collector; a first resistor, one end of which is connected to the emitter of said first transistor; a second resistor, one end of which is connected to the emitter of said second transistor; a third resistor, one end of which is connected to ground; means for connecting the other ends of said first to third resistors in common; means for connecting the emitters of said third and fourth transistors with the collector of said first transistor; means for connecting the emitters of said fifth and sixth transistors with the collector of said second transistor; means for connecting the base of the third transistor with the base of the sixth transistor; means for connecting the base of the fourth transistor with the base of the fifth transistor; a fourth resistor, one end of which is connected to the collectors of said third and fifth transistors; a fifth resistor, one end of which is connected to the collectors of said fourth and sixth transistors; means for connecting the other ends of said fourth and sixth resistors with a first voltage source; means for connecting the base of said first transistor with a second voltage source; means for connecting the bases of said fourth and fifth transistors with a third voltage source; first input means for applying a first input signal to the base of said sixth transistor; second input means for applying a second input signal to the base of said second transistor; a first constant current circuit connected between the emitter of said first transistor and ground; a second constant current circuit connected between the emitter of said second transistor and ground; a third constant current circuit connected between the collector of said first transistor and said first voltage source; and a fourth constant current circuit connected between the collector of said second transistor and said first voltage source.
Claim 2
Dependent Claim
325 words
A transistor amplifier circuit comprising: first to sixth transistors, each having an emitter, a base and a collector; a first resistor, one end of which is connected to the emitter of said first transistor; a second resistor, one end of which is connected to the emitter of said second transistor; a third resistor, one end of which is connected to ground; means for connecting the other ends of said first to third resistors in common; means for connecting the emitters of said third and fourth transistors with the collector of said first transistor; means for connecting the emitters of said fifth and sixth transistors with the collector of said second transistor; means for connecting the base of the third transistor with the base of the sixth transistor; means for connecting the base of the fourth transistor with the base of the fifth transistor; a fourth resistor, one end of which is connected to the collectors of said third and fifth transistors; a fifth resistor, one end of which is connected to the collectors of said fourth and sixth transistors; means for connecting the other ends of said fourth and sixth resistors with a first voltage source; means for connecting the base of said first transistor with a second voltage source; means for connecting the bases of said fourth and fifth transistors with a third voltage source; first input means for applying a first input signal to the base of said sixth transistor; second input means for applying a second input signal to the base of said second transistor; a first constant current circuit connected between the emitter of said first transistor and ground; a second constant current circuit connected between the emitter of said second transistor and ground; a third constant current circuit connected between the collector of said first transistor and said first voltage source; and a fourth constant current circuit connected between the collector of said second transistor and said first voltage source.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |