Group delay precompensator for broadband radio frequency...

Details Group delay precompensator for broadband radio frequency... Group delay precompensator for broadband radio frequency...

2005-09-20

2005-09-20

Vuong, Quochien B. (Department: 2685)

Telecommunications

Transmitter

Noise or interference elimination

C455S063100, C455S067130, C455S127200, C330S149000, C330S278000, C375S297000

Reexamination Certificate

active

06947712

ABSTRACT:
The present invention provides, for use in a radio frequency (RF) transmitter that employs a power amplifier to transmit broadband signals, the power amplifier introducing amplitude and phase distortion, a group delay precompensator circuit. In one embodiment, the group delay precompensator circuit includes: (1) a Cartesian feedback loop coupled between an output of the power amplifier and an input of the RF transmitter; and (2) a group delay compensation block, located in the Cartesian feedback loop, that introduces an opposing phase characteristic into the Cartesian feedback loop and thereby precompensates for the phase distortion. A method of precompensating a group delay and an RF transmitter incorporating the precompensator or the method are also disclosed.

REFERENCES:
patent: 5420536 (1995-05-01), Faulkner et al.
patent: 5894496 (1999-04-01), Jones
patent: 6275685 (2001-08-01), Wessel et al.
patent: 6396345 (2002-05-01), Dolman
patent: 6449465 (2002-09-01), Gailus et al.
patent: 6639950 (2003-10-01), Lagerblom et al.
Himmelstoss et al.; Compensated Class-D Amplifier as High Quality AC-Voltage Source; IEEE 1999 International Conference on Power Electronics and Drive Systems, PEDS '99, Jul. 1999; pp 116-120; Hong Kong.
Grant et al.; A DSP Controlled Adaptive Feedforward Amplifier Linearizer; School of Engineering Science; pp 788-792; 1996.

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