Amplifiers – Hum or noise or distortion bucking introduced into signal...
Patent
1998-12-21
2000-05-23
Pascal, Robert
Amplifiers
Hum or noise or distortion bucking introduced into signal...
330124R, 455126, H03F 126
Patent
active
060669837
ABSTRACT:
An RF power amplifier includes a first monitoring circuit that is coupled to an output signal of the power amplifier, and generates a first control signal based on a level of intermodulation distortion in the output signal. The first control signal has a first value when the level of intermodulation distortion in the output signal is less than a predetermined level of intermodulation distortion and second value when the level of intermodulation distortion in the output signal is greater than or equal to the predetermined level of intermodulation distortion. A second monitoring circuit is coupled to the output signal and generates a second control signal based on a power level of the output signal. The second control signal controls a level of the input RF signal so that the power level of the output signal is less than a predetermined power level. A phase shift/hybrid network is coupled to a primary signal path and an auxiliary signal path of the power amplifier. The phase shift/hybrid network receives an input RF signal, and is responsive to the first control signal by generating only a first signal that is coupled to the primary signal path when the first control signal has the first value, and by generating the first signal and a second signal that are respectively coupled to the primary signal path and the auxiliary signal path when the first control signal has the second value.
REFERENCES:
patent: 4064464 (1977-12-01), Morse
patent: 4238855 (1980-12-01), Zborowski
patent: 5610556 (1997-03-01), Rubin
patent: 5781066 (1998-07-01), Parisi et al.
patent: 5796306 (1998-08-01), Tsumura
patent: 5872481 (1999-02-01), Sevic et al.
patent: 5973559 (1999-10-01), Alberty
AT&T Corp
Nguyen Khanh Van
Pascal Robert
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