US3670253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A.c. power amplifier
Assignee: Individual
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Filing: 1970-06-18
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Granted: 1972-06-13
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Expires: 1990-06-18
Abstract
Abstract A high power, low distortion, A.C. power amplifier for laboratory and special applications.
Inventors
- 👤 Arthur L Newcomb Jr
- 👤 Richard N Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:38
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/30; H03F3/3069; H03F3/3071
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
249 words
In a power amplifier, a voltage amplifier including: a first resistor, a first diode means, the collector and the emitter of a first transistor connected in series between a positive power supply and a negative power supply with the base of said first transistor being the input to said voltage amplifier; second and third output transistors that are complementary to each other with the collector of said second transistor, the emitter of said second transistor, a second resistor, the emitter of said third transistor, the collector of said third transistor and a third resistor connected in series between said positive power supply and said negative power supply with the output terminal of the power amplifier being at the junction of said second resistor and said third transistor; second diode means connected between the base of said second transistor and the base of said third transistor; third diode means connected between the base of said third transistor and the collector of said first transistor; first power limiting means connected to the junction of said second transistor and said second resistor and to the base of said second transistor for limiting the current through said second transistor whereby the power dissipated in said second transistor is limited; and a second power limiting means connected to the junction of said third transistor and said third resistor and to the base of said third transistor for limiting the current through said third resistor whereby the power dissipated in said third transistor is limited.
Claim 2
Dependent Claim
249 words
In a power amplifier, a voltage amplifier including: a first resistor, a first diode means, the collector and the emitter of a first transistor connected in series between a positive power supply and a negative power supply with the base of said first transistor being the input to said voltage amplifier; second and third output transistors that are complementary to each other with the collector of said second transistor, the emitter of said second transistor, a second resistor, the emitter of said third transistor, the collector of said third transistor and a third resistor connected in series between said positive power supply and said negative power supply with the output terminal of the power amplifier being at the junction of said second resistor and said third transistor; second diode means connected between the base of said second transistor and the base of said third transistor; third diode means connected between the base of said third transistor and the collector of said first transistor; first power limiting means connected to the junction of said second transistor and said second resistor and to the base of said second transistor for limiting the current through said second transistor whereby the power dissipated in said second transistor is limited; and a second power limiting means connected to the junction of said third transistor and said third resistor and to the base of said third transistor for limiting the current through said third resistor whereby the power dissipated in said third transistor is limited.
Claim 3
Dependent Claim
83 words
A voltage amplifier according to claim 1 wherein said first power limiting means includes: a fourth resistor, a fifth resistor, and a sixth resistor connected in series between said positive power supply and the junction of said second transistor and said second resistor; fourth diode means connected between the junction of said fourth and fifth resistors and said output terminal; and means for feeding back the voltage at the junction of said fifth and sixth resistors to the base of said second transistor.
Claim 4
Dependent Claim
149 words
In a power amplifier having a transistor in its output circuit with the collector of said transistor, the emitter of said transistor and a first resistor connected in series between a power supply and the output terminal of said power amplifier, means for limiting the power dissipated in said transistor comprising: a second resistor, a third resistor, and a fourth resistor connected in series between said power supply and the junction of said first resistor and said transistor; diode means connected between said output terminal and the junction of said second resistor and said third resistor to limit the voltage at the junction of said second and third resistors relative to the voltage at said output terminal; and means for feeding back the voltage developed at the junction of said third and fOurth resistors to the base of said transistor whereby the power dissipated by said transistor is limited.
Claim 5
Dependent Claim
149 words
In a power amplifier having a transistor in its output circuit with the collector of said transistor, the emitter of said transistor and a first resistor connected in series between a power supply and the output terminal of said power amplifier, means for limiting the power dissipated in said transistor comprising: a second resistor, a third resistor, and a fourth resistor connected in series between said power supply and the junction of said first resistor and said transistor; diode means connected between said output terminal and the junction of said second resistor and said third resistor to limit the voltage at the junction of said second and third resistors relative to the voltage at said output terminal; and means for feeding back the voltage developed at the junction of said third and fOurth resistors to the base of said transistor whereby the power dissipated by said transistor is limited.
Claim 6
Dependent Claim
158 words
In a power amplifier according to claim 3 having a second transistor in its output circuit with the emitter of said second transistor, the collector of said second transistor and a fifth resistor connected in series between said output terminal and a second power supply, means for limiting the power dissipated in said second transistor comprising: a sixth resistor, a seventh resistor and an eighth resistor connected in series between said output terminal and the junction of said second transistor and said fifth resistor; second diode means connected between said second power supply and the junction of said sixth and seventh resistors to limit the voltage at the junction of said sixth and seventh resistors relative to the voltage at said second power supply; and means for feeding back the voltage developed at the junction of said seventh and eighth resistors to the base of said second transistor whereby the power dissipated by said second transistor is limited.
Claim 7
Dependent Claim
31 words
In a power amplifier according to claim 4 wherein third diode means are connected between the bases of the two transistors whereby when one is conducting, the other is made nonconducting.
References Cited (Backward Citations)
US3471794A
Cited
US3562660A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |