US 7,321,268 B2
Ultra wideband and fast hopping frequency synthesizer for MB-OFDM wireless application
Ronald Chang, Fremont, Calif. (US); Sheng Yen, Fremont, Calif. (US); and Wei Gao, Fremont, Calif. (US)
Assigned to VIA Technologies, Taipei (Taiwan)
Filed on Mar. 16, 2006, as Appl. No. 11/377,735.
Claims priority of provisional application 60/733533, filed on Nov. 04, 2005.
Prior Publication US 2007/0105518 A1, May 10, 2007
Int. Cl. H03B 21/01 (2006.01); H03B 21/02 (2006.01); H03L 7/16 (2006.01); H04B 1/26 (2006.01)
U.S. Cl. 331—37  [331/25; 331/38; 331/39; 455/313; 455/314] 22 Claims
OG exemplary drawing
 
1. A frequency synthesizer, comprising:
a signal generation unit adapted to generate a plurality of output signals;
a first stage signal mixer unit capable of receiving a plurality of output signals from the signal generation unit and outputting a plurality of first mixed signals;
a first stage selector unit capable of receiving a plurality of first mixed signals from the first stage signal mixer unit and a plurality of output signals from the signal generation unit, the first stage selector unit outputting a plurality of selected signals;
a second stage signal mixer unit capable of receiving a plurality of output signals from the signal generation unit and a plurality of selected signals from the first stage selector unit, and outputting a plurality of second mixed signals; and
a second stage selector unit capable of receiving the plurality of second mixed signals and outputting a plurality of ultra wideband signals.