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US 3,944,944 AGranted
Power amplifier with distortion control
OwnerDaniel G. Ellenbeckerinventor
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OwnerDaniel G. Ellenbeckerinventor
Estimating the term…
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.
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.
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.
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.
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.
Dependencies are inferred from the claim text.