Amplifier linearization using delta-sigma predistortion

Details Amplifier linearization using delta-sigma predistortion Amplifier linearization using delta-sigma predistortion

2005-08-30

2005-08-30

Nguyen, John B (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

C341S144000, C341S145000, C375S296000

Reexamination Certificate

active

06937175

ABSTRACT:
In one embodiment of the present invention, an amplifier circuit is provided which includes a predistorter coupled to a power amplifier. An error detector is coupled to the signal input of the predistorter via a delay circuit and to the power amplifier output. The error detector output is coupled to a delta-sigma modulator and the output of the delta-sigma is coupled to the control input of the predistorter. The predistorter may be constructed to provide an output selected from a set of output characteristic curves, in response to a control signal at the control input. The control input of the predistorter may be a multi-bit discrete input, which may be a binary input, such as for example, a three bit binary input.

REFERENCES:
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patent: 2004/0151257 (2004-08-01), Staszewski et al.
S. Norsworthy, R. Schreier, and G. Temes, “Delta-Sigma Data Converters: Theory, Design and Simulation,” pp. 1-43, IEEE Pres, New York, 1997 (ISBN 0-7803-1045-4), no month.
Kennington, Peter B., High-linearity RF amplifier design, pp. 351-361, Artech House, Norwood, MA, 2000 (ISBN 1-58053-143-1), no month.
Cripps, Steven C., Advanced techniques in RF power amplifier design, pp. 153-195, Artech House, Norwood, MA, 2002 (ISBN 1-58053-282-9), no month.

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