Method and apparatus for opening a feedback loop

Details Method and apparatus for opening a feedback loop Method and apparatus for opening a feedback loop

2007-01-16

2007-01-16

Pascal, Robert (Department: 2817)

Amplifiers

Signal feedback

Variable impedance in feedback path varied by separate...

C330S085000, C330S136000

Reexamination Certificate

active

10988432

ABSTRACT:
Circuits, methods, and systems are provided for opening a primary feedback loop in a transmitter. An auxiliary feedback loop can be closed when the primary feedback loop is opened, and a controller can match a gain of the primary feedback loop to another gain in the transmitter.

REFERENCES:
patent: 5469105 (1995-11-01), Sparks
patent: 5933767 (1999-08-01), Leizerovich et al.
Dawson et al., “Automatic Phase Alignment for a Fully Integrated Cartesian Feedback Power Amplifier System”, IEEE Journal of Solid-State Circuits, Dec. 2003, 38(12):2269-2279.
Faulkner et al., “Performance of automatic phase adjustment using supply current minimization in a RF feedback lineariser,” in Proc. 8th IEEE Int. Symp. Personal, Indoor, and Mobile Radio Communications, 1997, pp. 858-862.
Ohishi et al., “Cartesian Feedback Amplifier with Soft Landing,” in Proc. 3rd IEEE Int. Symp. Personal, Indoor, and Wireless Communications, 1992, pp. 402-406.
Sornin et al., “A robust Cartesian feedback loop for a 802.11 a/b/g CMOS transmitter”, 2004. IEEE Radio Frequency Integrated Circuits (RFIC) Symposium, Fort Worth, TX, Jun. 6-8, 2004, pp. 145-148.

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