Amplifiers – With semiconductor amplifying device – Including plural amplifier channels
Patent
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.
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Kennedy R. P.
Lockheed Martin Corporation
Meise W. H.
Nguyen Patricia T.
Pascal Robert
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