Amplification system having mask detection

Details Amplification system having mask detection Amplification system having mask detection

1998-10-19

2000-11-14

Pascal, Robert

Amplifiers

Hum or noise or distortion bucking introduced into signal...

330132, 330107, H03F 126, H03F 136, H03G 516

Patent

active

061475556

ABSTRACT:
A method and apparatus reduce the out-of-band frequency components of an RF amplified signal, preferably a CDMA signal, which has a carrier frequency which is not known in advance. The apparatus and method feature locating the frequency of the incoming signal by examining an RF output signal having both in-band frequency components and out-of-band frequency components. Typically the output signal is generated using a high-power, Class A/B amplifier. Once the frequency of the carrier has been determined, the out-of-band components are used to generate control signals which, in, for example, a feedback or feedforward circuitry, reduce the energy of the out-of-band signals and thereby provide a more linear amplifier transfer function.

REFERENCES:
patent: 5455538 (1995-10-01), Kobayashi
patent: 5570063 (1996-10-01), Eisenberg
patent: 5712593 (1998-01-01), Buer et al.
patent: 5929704 (1999-07-01), Proctor, Jr. et al.

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