Amplifiers – Hum or noise or distortion bucking introduced into signal...
Patent
1976-09-08
1977-12-06
Dahl, Lawrence J.
Amplifiers
Hum or noise or distortion bucking introduced into signal...
330252, 330124R, 330151, H03F 126
Patent
active
040619842
ABSTRACT:
A transistor power amplifier for transmitting systems, particularly high frequency systems, has two parallel connected signal paths each of which is fed with the input signal. In a first of the signal paths, a 6 dB attenuator connects the input to the input of an amplifier and a fraction of the output of the amplifier is connected to one input of a correction amplifier, constructed as a differential amplifier. In the other signal path a delay member which simulates the delay of the first amplifier connects the circuit input to another input of the correction amplifier. The correction amplifier therefore is provided with a fraction of a delayed amplified signal which is subjected to error and includes an error component and with the delayed original input signal and emits a control signal for a second amplifier in which the error component produced in the first amplifier is contained in a double and inverted magnitude. A parallel connection of this signal with the delayed original input signal, further attenuated by 3 dB, is provided to the second amplifier which is in the second signal path. A second delay member is connected to the output of the first amplifier to simulate the delay of the second amplifier, and the second delay member and the output of the second amplifier are provided in a parallel connection to produce the output of the transistor power amplifier.
REFERENCES:
patent: 3815040 (1974-06-01), Seidel
Dahl Lawrence J.
Siemens Aktiengesellschaft
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