Feed-forward amplifier loop control utilizing if signal...

Details Feed-forward amplifier loop control utilizing if signal... Feed-forward amplifier loop control utilizing if signal...

2005-05-24

2005-05-24

Nguyen, Patricia (Department: 2817)

Amplifiers

With amplifier bypass means

C330S052000, C330S149000

Reexamination Certificate

active

06897723

ABSTRACT:
An amplifier arrangement including a main amplifier to which feed-forward cancellation is applied, where the amplifier arrangement comprises an input for receiving signals to be amplified, an output for providing an amplified input signal, a pilot signal modulation circuit to generate a CW frequency shifted pilot signal, a mixer down for converting the pilot signal to an IF signal, and a sampling circuit for digitally sampling the IF signal. The amplifier arrangement includes a signal cancellation loop and a distortion cancellation loop each acting as an independent control function for minimizing pilot signal. The signal cancellation loop utilizes a Cartesian loop method for controlling the signal cancellation loop for sensing both phase and amplitude information simultaneously. The Cartesian loop uses a high frequency active mixer, which is a dual cross coupled differential pairs of devices capable of operating with input signals from near DC to 2.4 GHz, for control of the signal cancellation loop.

REFERENCES:
patent: 5157346 (1992-10-01), Powell et al.
patent: 5999048 (1999-12-01), Zhou
patent: 6169450 (2001-01-01), Gentzler
patent: 6211733 (2001-04-01), Gentzler
patent: 6359508 (2002-03-01), Mucenieks
patent: 0982850 (1999-08-01), None
U.S. patent application Publication U.S. 2002/0048326 A1 of Sahlman.

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