Amplifier and driver system with multichannel operation

Details Amplifier and driver system with multichannel operation Amplifier and driver system with multichannel operation

1998-03-16

1999-11-23

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including plural amplifier channels

330298, 330311, H03F 368, H03F 304, H02H 720

Patent

active

059907509

ABSTRACT:
An RF amplifier includes a FET output stage and a driver. The FET is subject to long-term degradation in multiple-carrier use if its average gate current often exceeds a predetermined value. The random superposition of signal peaks of the multicarrier signal may cause such peaks to occur. The driver stage is selected to provide a range of four dB or less between the single-signal 1 dB compression point and the hard compression point, as measured by driver input signal level. This prevents application of excessive input signal to the output stage in a multicarrier situation, and prevents degradation of the FETs of the output stage. In one embodiment, a predistortion equalizer or linearizer is placed before the driver stage, to tend to linearize the characteristic of the driver and output stage combination at signal levels below those at which the driver is limited.

REFERENCES:
patent: 4241266 (1980-12-01), Orban
patent: 4249137 (1981-02-01), Malchow
patent: 4468631 (1984-08-01), Goldberg
patent: 4743863 (1988-05-01), Cassany et al.
patent: 4916407 (1990-04-01), Olver
patent: 4992753 (1991-02-01), Jenson et al.
patent: 5119042 (1992-06-01), Crampton et al.
patent: 5191338 (1993-03-01), Katz et al.
patent: 5420541 (1995-05-01), Upton et al.
patent: 5770970 (1998-06-01), Ikeda et al.
patent: 5789979 (1998-08-01), Kumar et al.

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