US 7,548,129 B2
On-chip R-C time constant calibration
Wai Lau, Taipei Hsien (Taiwan); Chao-Wen Tseng, Hsin-Chu Hsien (Taiwan); Wei-Chien Chiu, Tai-Nan (Taiwan); and Ying-Chi Chen, Tai-Chung (Taiwan)
Assigned to Quantek, Inc., Sindian, Taipei Hsien (Taiwan)
Filed on Oct. 23, 2006, as Appl. No. 11/552,139.
Claims priority of provisional application 60/597170, filed on Nov. 14, 2005.
Prior Publication US 2007/0109063 A1, May 17, 2007
Int. Cl. H03K 3/02 (2006.01); H04B 1/10 (2006.01)
U.S. Cl. 331—143  [331/44; 327/553] 4 Claims
OG exemplary drawing
 
1. An integrated tuner comprising:
a quadrature mixer;
a polyphase filter having a first input and a second input, the first input coupled to an output of the quadrature mixer;
a relaxation oscillator;
a digital calibration module having an output coupled to the second input of the polyphase filter and to an input of the relaxation oscillator, and also having an input coupled to an output of the relaxation oscillator;
a two input AND gate having a first input coupled to the input of the digital calibration module;
a counter having an input coupled to an output of the two input AND gate; and
a finite state machine having an input coupled to an output of the counter, a first output coupled to the output of the digital calibration module, and a second output coupled to a second input of the two input AND gate.