US4560946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power amplifier
Assignee: Nippon Gakki Co Ltd
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Filing: 1984-03-21
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Granted: 1985-12-24
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Expires: 2004-03-21
Abstract
Abstract A power amplifier with a low distortion and a high power efficiency includes a first amplifier of the low distortion type for being powered by a first voltage source to amplify an input signal thereto to apply an output signal to a first terminal, and a second amplifier of the high power efficiency type for being powered by a second voltage source to amplify the input signal to apply an output signal to a second terminal. A load is connected between the first and second terminals. The output voltage of the second voltage source is greater than that of the first voltage source. A first feedback path is provided for feeding back the output signal of the first amplifier to an input thereof. A second feedback path is provided for feeding back the output signal of the second amplifier to the input of the first amplifier.
Inventors
- 👤 Kenji Yokoyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:40
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/30; H03F3/3081; H03F1/00; H03F1/02; H03F1/0205; H03F1/34
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
175 words
A power amplifier comprising: (a) an input terminal for being supplied with an input signal; (b) first and second terminals for connecting a load therebetween; (c) first amplifier means for being supplied with a voltage from first voltage source means to amplify said input signal to apply an output signal to said first terminal; (d) second amplifier means for being supplied with a voltage from second voltage source means to amplify said input signal to apply an output signal to said second terminal, said voltage from said second voltage source means being greater than said voltage from said first voltage source means, said second amplifier means having a higher power efficiency than said first amplifier means, and said first amplifier means having a lower distortion than said second amplifier means; (e) first feedback path means for feeding back said output signal of said first amplifying means to an input thereof; and (f) second feedback path means for feeding back said output signal of said second amplifier means to said input of said first amplifier means.
Claim 2
Dependent Claim
175 words
A power amplifier comprising: (a) an input terminal for being supplied with an input signal; (b) first and second terminals for connecting a load therebetween; (c) first amplifier means for being supplied with a voltage from first voltage source means to amplify said input signal to apply an output signal to said first terminal; (d) second amplifier means for being supplied with a voltage from second voltage source means to amplify said input signal to apply an output signal to said second terminal, said voltage from said second voltage source means being greater than said voltage from said first voltage source means, said second amplifier means having a higher power efficiency than said first amplifier means, and said first amplifier means having a lower distortion than said second amplifier means; (e) first feedback path means for feeding back said output signal of said first amplifying means to an input thereof; and (f) second feedback path means for feeding back said output signal of said second amplifier means to said input of said first amplifier means.
Claim 3
Dependent Claim
26 words
A power amplifier according to claim 1, further comprising an equalizer circuit for coinciding transfer functions of said first and second amplifier means with each other.
Claim 4
Dependent Claim
162 words
A power amplifier according to claim 2, in which said first amplifier means comprises a first amplifier having inverting and non-inverting input terminals, said input signal being applied to said non-inverting input terminal of said first amplifier, said first feedback path means comprising a second amplifier having inverting and non-inverting input terminals and series-connected first and second resistors through which an output terminal of said first amplifier is grounded, the non-inverting input terminal of said second amplifier being connected to a junction point of said first and second resistors, an output terminal of said second amplifier being connected to the inverting input terminal of said first amplifier, said second feedback path means comprising said second amplifier and series-connected third and fourth resistors through which the output of said second amplifier means is connected to the output terminal of said second amplifier, and said inverting input terminal of said second amplifier being connected to a junction point between said third and fourth resistors.
Claim 5
Dependent Claim
162 words
A power amplifier according to claim 1, in which said first amplifier means comprises a first amplifier having inverting and non-inverting input terminals, said input signal being applied to said non-inverting input terminal of said first amplifier, said first feedback path means comprising a second amplifier having inverting and non-inverting input terminals and series-connected first and second resistors through which an output terminal of said first amplifier is grounded, the non-inverting input terminal of said second amplifier being connected to a junction point of said first and second resistors, an output terminal of said second amplifier being connected to the inverting input terminal of said first amplifier, said second feedback path means comprising said second amplifier and series-connected third and fourth resistors through which the output of said second amplifier means is connected to the output terminal of said second amplifier, and the inverting input terminal of said second amplifier being connected to a junction point between said third and fourth resistors.
Claim 6
Dependent Claim
104 words
A power amplifier according to claim 1, in which said first amplifier means comprises an amplifier having inverting and non-inverting input terminals, said first feedback path means comprising series-connected first and second resistors through which an output terminal of said amplifier is grounded, said inverting input terminal of said amplifier being connected to a junction point between said first and second resistors, said second feedback path means comprising series-connected third and fourth resistors connected between the input and output of said second amplifier means, and said non-inverting input terminal of said amplifier being connected to a junction point of said third and fourth resistors.
Claim 7
Dependent Claim
112 words
A power amplifier according to claim 1, in which said first amplifier means comprises an amplifier having inverting and non-inverting input terminals, said first feedback path means comprising series-connected first and second resistors through which an input of said second amplifier means is connected to an output terminal of said amplifier, said inverting input terminal of said amplifier being connected to a junction point of said first and second resistors, said second feedback path means comprising series-connected third and fourth resistors through which an output of said second amplifier means is grounded, and said non-inverting input terminal of said amplifier being connected to a junction point of said third and fourth resistors.
Claim 8
Dependent Claim
167 words
A power amplifier according to claim 6, in which said first voltage source means comprises series-connected first and second voltage sources having the same output voltage, a junction point of said first and second voltage sources being grounded, a positive output terminal of said first voltage source means being connected to a positive voltage input terminal of said first amplifier means while a negative output terminal of said first voltage source means is connected to a negative voltage input terminal of said first amplifier means, said second voltage source means comprising a third voltage source having a negative output terminal connected to the negative output terminal of said first voltage source means and a positive output terminal connected to a positive voltage input terminal of said second amplifier means, and a fourth voltage source having a positive output terminal connected to the positive output terminal of said first voltage source means and a negative output terminal connected to a negative voltage input terminal of said second amplifier.
Claim 9
Dependent Claim
24 words
A power amplifier according to claim 7, in which said first amplifier means is biased to an extent greater than said second amplifier means.
Claim 10
Dependent Claim
26 words
A power amplifier according to claim 8, in which said first amplifier means comprises a Class-A amplifier while said second amplifier means comprises a Class-AB amplifier.
Claim 11
Dependent Claim
26 words
A power amplifier according to claim 8, in which said first amplifier means comprises a Class-AB amplifier while said second amplifier means comprises a Class-B amplifier.
Claim 12
Dependent Claim
26 words
A power amplifier according to claim 8, in which said first amplifier means comprises a Class-A amplifier while said second amplifier means comprises a Class-B amplifier.
Claim 13
Dependent Claim
26 words
A power amplifier according to claim 7, in which said first amplifier means comprises a Class-A amplifier while said second amplifier means comprises a Class-D amplifier.
Claim 14
Dependent Claim
26 words
A power amplifier according to claim 7, in which said first amplifier means comprises a Class-AB amplifier while said second amplifier means comprises a Class-D amplifier.
Claim 15
Dependent Claim
24 words
A power amplifier according to claim 1, in which said first amplifier means is biased to an extent greater than said second amplifier means.
Claim 16
Dependent Claim
26 words
A power amplifier according to claim 14, in which said first amplifier means comprises a Class-A amplifier while said second amplifier means comprises a Class-AB amplifier.
Claim 17
Dependent Claim
26 words
A power amplifier according to claim 14, in which said first amplifier means comprises a Class-AB amplifier while said second amplifier means comprises a Class-B amplifier.
Claim 18
Dependent Claim
26 words
A power amplifier according to claim 14, in which said first amplifier means comprises a Class-A amplifier while said second amplifier means comprises a Class-B amplifier.
Claim 19
Dependent Claim
26 words
A power amplifier according to claim 1, in which said first amplifier means comprises a Class-A amplifier while said second amplifier means comprises a Class-D amplifier.
Claim 20
Dependent Claim
26 words
A power amplifier according to claim 1, in which said first amplifier means comprises a Class-AB amplifier while said second amplifier means comprises a Class-D amplifier.
References Cited (Backward Citations)
JPS5813004A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-23 | 1989-06-24 | 1989-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-23 | 1993-06-24 | 1993-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-23 | 1997-06-24 | 1997-12-24 | $7700.00 | Window Closed / Lapsed |