Switched transformer for adjusting power amplifier loading

Details Switched transformer for adjusting power amplifier loading Switched transformer for adjusting power amplifier loading

2006-09-05

2006-09-05

Wells, Kenneth B. (Department: 2816)

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

C333S177000

Reexamination Certificate

active

07102464

ABSTRACT:
A circuit includes a transmission line transformer coupled between an input and output port. An inductor may be selectively coupled into the ground return path of the transmission line transformer to alter the impedance transformation provided between the input and output ports.

REFERENCES:
patent: 5060294 (1991-10-01), Schwent et al.
patent: 5285179 (1994-02-01), Wignot et al.
patent: 5321348 (1994-06-01), Vinciarelli et al.
patent: 5432431 (1995-07-01), Vinciarelli et al.
patent: 5619283 (1997-04-01), Pugel
patent: 5815386 (1998-09-01), Gordon
patent: 0840349 (1998-05-01), None
patent: 2452207 (1980-10-01), None
“Broadband Transmission Line Transformer Family Matches A Wide Range Of Impedances”, RF Design, Cardiff Publishing Co., vol. 17, No. 2, Feb. 1, 1994, pp. 62, 64-66.
“Some Borad-Band Transformers” by C.L. Ruthroff, Feb. 5, 1959 (revised Apr. 1, 1959), pp. 1337-1342.

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