US3944944A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power amplifier with distortion control
Assignee: Individual
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Filing: 1974-10-24
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Granted: 1976-03-16
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Expires: 1994-10-24
Abstract
Abstract An electrical audio power amplifier is connected to receive an input informational signal from a pre-amplifying stage functioning with a transducer or pick-up device such as a magnetic phono cartridge or tape head and connected to supply a transformerless output to drive a speaker to create audio sound waves substantially free of distortion. An input differential amplifier includes a first input supplying the input informational signal and a second input supplying the output informational signal and providing a differential output signal to an output amplifying stage including a pair of intermediate amplifiers and a power amplifier to directly provide the output informational signal to the speaker. A second compensating differential amplifier includes a first input supplying the input informational signal and a second input having a variable tapped impedance such as a resistor supplying the output informational signal and providing a compensating output signal in response to sensed distortion which is summed with the differential output signal provided by the input differential amplifier to substantially eliminate distortion.
Inventors
- 👤 Daniel G. Ellenbecker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:47
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/32; H03F1/3223
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
120 words
A power amplifier for receiving an input informational signal and providing an amplified output informational signal, comprising first amplifying means including a first amplifier having an input receiving said input informational signal and an output providing an amplified intermediate output signal in response to said input informational signal, second amplifying means including a second amplifying stage having an input connected to said amplifier output and a third amplifying stage connected in series electrical circuit with said second stage and providing said amplified output informational signal in response to said intermediate signal, and compensating means sensing distortion between said input and output informational signals and connected to said first amplifier output and selectively modifying said intermediate signal for eliminating said distortion.
Claim 2
Dependent Claim
120 words
A power amplifier for receiving an input informational signal and providing an amplified output informational signal, comprising first amplifying means including a first amplifier having an input receiving said input informational signal and an output providing an amplified intermediate output signal in response to said input informational signal, second amplifying means including a second amplifying stage having an input connected to said amplifier output and a third amplifying stage connected in series electrical circuit with said second stage and providing said amplified output informational signal in response to said intermediate signal, and compensating means sensing distortion between said input and output informational signals and connected to said first amplifier output and selectively modifying said intermediate signal for eliminating said distortion.
Claim 3
Dependent Claim
46 words
The power amplifier of claim 1, wherein said compensating means includes a differential amplifier having a first current input operatively receiving said input informational signal and a second current input operatively receiving said output informational signal and providing a compensating current output modifying said intermediate signal.
Claim 4
Dependent Claim
42 words
The power amplifier of claim 2, wherein said second current input is operatively connected to an output of said second amplifying means through a variable impedance selectively adjusted to provide a null compensating current output in response to the lack of distortion.
Claim 5
Dependent Claim
101 words
A power amplifier for receiving an input informational signal and providing an amplified output informational signal, comprising an input amplifier connected to receive said input informational signal and providing a first current signal at an output of said amplifier, means providing a second current signal varying in response to said input and output informational signals, summing means connected to said amplifier output and directly summing said first and second current signals and providing a compensated output signal, and means amplifying said compensated output signal and including a plurality of amplifying stages for providing said output informational signal substantially free of distortion.
Claim 6
Dependent Claim
101 words
A power amplifier for receiving an input informational signal and providing an amplified output informational signal, comprising an input amplifier connected to receive said input informational signal and providing a first current signal at an output of said amplifier, means providing a second current signal varying in response to said input and output informational signals, summing means connected to said amplifier output and directly summing said first and second current signals and providing a compensated output signal, and means amplifying said compensated output signal and including a plurality of amplifying stages for providing said output informational signal substantially free of distortion.
Claim 7
Dependent Claim
61 words
The power amplifier of claim 4, wherein said second current signal means includes a differential amplifier connected to a constant current source and including a first current input operatively connected to receive said input informational signal and a second current input operatively connected to receive said output informational signal and an output supplying said second current signal to said summing means.
Claim 8
Dependent Claim
113 words
A power amplifier for receiving an input informational signal and providing an amplified output informational signal, comprising first amplifying means having a first input operatively connected to receive said input informational signal and a second input operatively connected to receive said output informational input signal and providing a differential output, second amplifying means operatively connected to receive said differential output and providing said output informational signal, and compensating means having a first input operatively connected to receive said informational input signal and a second input operatively connected to receive said output informational signal and providing a compensating output operatively connected to said differential output and compensating said informational output signal for eliminating distortion.
Claim 9
Dependent Claim
113 words
A power amplifier for receiving an input informational signal and providing an amplified output informational signal, comprising first amplifying means having a first input operatively connected to receive said input informational signal and a second input operatively connected to receive said output informational input signal and providing a differential output, second amplifying means operatively connected to receive said differential output and providing said output informational signal, and compensating means having a first input operatively connected to receive said informational input signal and a second input operatively connected to receive said output informational signal and providing a compensating output operatively connected to said differential output and compensating said informational output signal for eliminating distortion.
Claim 10
Dependent Claim
25 words
The power amplifier of claim 6, wherein said differential output and said compensating output are summed to provide an input to said second amplifying means.
Claim 11
Dependent Claim
186 words
An electrical power audio amplifier for receiving an input informational signal and providing an amplified output informational signal, comprising a first differential amplifier having first and second current amplifying means each having an input connected to a common output of a first constant current source with said first amplifying means conducting a first current signal in response to said output informational signal and said second amplifying means conducting a second current signal in response to said input informational signal and said first current signal, a second differential amplifier having third and fourth amplifying means each having an input connected to a common output of a second constant current source with said third amplifying means conducting a third current signal in response to said output informational signal and said fourth amplifying means conducting a fourth current signal in response to said input informational signal and said third current signal, summing means providing an intermediate output signal in response to said second and fourth current signals, and output amplifying means providing said amplified output informational signal in response to said intermediate output signal and substantially free of distortion.
Claim 12
Dependent Claim
186 words
An electrical power audio amplifier for receiving an input informational signal and providing an amplified output informational signal, comprising a first differential amplifier having first and second current amplifying means each having an input connected to a common output of a first constant current source with said first amplifying means conducting a first current signal in response to said output informational signal and said second amplifying means conducting a second current signal in response to said input informational signal and said first current signal, a second differential amplifier having third and fourth amplifying means each having an input connected to a common output of a second constant current source with said third amplifying means conducting a third current signal in response to said output informational signal and said fourth amplifying means conducting a fourth current signal in response to said input informational signal and said third current signal, summing means providing an intermediate output signal in response to said second and fourth current signals, and output amplifying means providing said amplified output informational signal in response to said intermediate output signal and substantially free of distortion.
Claim 13
Dependent Claim
182 words
The power amplifier of claim 8, wherein said first current amplifying means including a first transistor circuit having a first emitter circuit connected to said first constant current and a first base circuit connected to operatively receive said output informational signal through a first predetermined impedance, said second current amplifying means including a second transistor circuit having a second emitter circuit connected to said first constant current source and a second base circuit connected to operatively receive said input informational signal and a second collector circuit connected to said summing means, said third current amplifying means including a third transistor circuit having a third emitter circuit connected to said second constant current source and a third base circuit connected to operatively receive said output informational signal through a second predetermined impedance including a selectively variable resistor, and said fourth current amplifying means including a fourth transistor circuit having a fourth emitter circuit connected to said second constant current source and a fourth base circuit connected to operatively receive said input informational signal and a fourth collector circuit connected to said summing means.
Claim 14
Dependent Claim
54 words
The power amplifier of claim 8, wherein said second amplifying means is operatively connected to a preamplifier for receiving said input informational signal and said output amplifying means is operatively connected to supply said output informational signal to a speaker for converting said input informational signal to audio sound waves substantially free of distortion.
Claim 15
Dependent Claim
47 words
The power amplifier of claim 8, wherein said output amplifying means includes a pair of output transistors connected in a push-pull arrangement and each having a collector circuit directly connected to a speaker for converting said input informational signal to audio sound waves substantially free of distortion.
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) | 1979-03-16 | 1979-09-15 | 1980-03-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-16 | 1983-09-15 | 1984-03-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-16 | 1987-09-15 | 1988-03-16 | $7700.00 | Window Closed / Lapsed |