Amplifiers – Hum or noise or distortion bucking introduced into signal...
Patent
1998-08-27
2000-07-18
Mottola, Steven J.
Amplifiers
Hum or noise or distortion bucking introduced into signal...
330136, 330107, H03F 132
Patent
active
060912987
ABSTRACT:
This invention relates to high power linear amplifiers. A high power linear amplifier is disclosed for communications such as CDMA communication systems. Linear amplifiers as used in communication systems exhibit a linear characteristic where the amplifiers output power increases relative to an input power. After a certain input level, known as a gain saturation point, the amplifier then exhibits non-linear characteristics; the output power increases relatively little with respect to power input. This non-linear region is also known as the saturation region or the gain compression region. In accordance with the invention, there is provided a power amplifier comprising a power amplifier, a feedback circuit and a control element;
wherein the feedback circuit receives a sample of the input signal delayed in time and employs phase and amplitude components of both the input signal delayed in time and a feedback signal derived from the output of the power amplifier to drive a control element, which control element determines the signal input to the amplifier whereby the power amplifier can produce an improved linear output.
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patent: 5182524 (1993-01-01), Hopkins
patent: 5742201 (1998-04-01), Eisenberg et al.
patent: 5770971 (1998-06-01), McNicol
Highly Efficient Broadband Linearisation of RF Amplifiers for Satellite and Cellular Applications--Kieran John Parsons--Mar. 1996.
McNicol John Duncan
Wessel David Neal
Mottola Steven J.
Nortel Networks Corporation
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