Amplifiers – With amplifier bypass means
Patent
1998-03-31
2000-06-20
Shingleton, Michael B
Amplifiers
With amplifier bypass means
330149, H03F 132
Patent
active
060782161
ABSTRACT:
A digital signal processor-resident RF power amplifier performance monitor generates and updates signals for controlling each of an adaptive predistortion unit and a vector modulator of a preamplification signal processing loop, and a vector modulator of a feed-forward error extraction and reinjection loop. A performance monitoring routine subjects monitored aliased data to a window function and determines the spectrum of the data. The spectral data is applied to a sensitivity mask, which masks the data in accordance with a carrier--intermodulation distortion function associated with the operation of the amplifier. The output of the mask is processed to derive a measure of intermodulation distortion power. The intermodulation distortion power is subjected to an error minimization operator, such as a perturbational gradient search, that adjusts each of the control signals for the components of the loops, in such a manner as to maximally cancel intermodulation distortion products.
REFERENCES:
patent: 5485120 (1996-01-01), Anvari
patent: 5515000 (1996-05-01), Maruyama et al.
Grant et al. "A DSP Controlled Adaptive Feedforward Amplifier Linearizer" IEEE pp 788-792, 1996.
Shingleton Michael B
Spectrian Corporation
Wands Charles E.
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