DocumentCode :
1854072
Title :
A 120-MHz active-RC filter with an agile frequency tuning scheme in 0.18-μm CMOS
Author :
Chen, Yu Chih ; Chiu, Wei Hao ; Lin, Tsung Hsien
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei
fYear :
2008
fDate :
23-25 April 2008
Firstpage :
208
Lastpage :
211
Abstract :
A wideband active-RC low-pass filter realized for high data rate wireless receivers is reported in this paper. This filter adopts the 5th-order elliptic topology and achieves a bandwidth of 120 MHz and a stopband attenuation of more than 45 dB. The wide-bandwidth operational amplifiers employed in the filter adopt the feedforward compensation technique to extend the unity-gain bandwidth to 4.1 GHz. An agile tuning scheme is also proposed to automatically adjust the filter cutoff frequency. It uses the successive approximation register counter in the digital tuning loop to compensate for the RC variations while achieves short calibration time. The filter is fabricated in the TSMC 0.18-mum CMOS process and dissipates 38 mW under 1.5-V supply voltage. The measured IIP3 is 21 dBm and the tuning time is 8 mus.
Keywords :
CMOS integrated circuits; RC circuits; compensation; low-pass filters; network topology; operational amplifiers; radio receivers; 5th-order elliptic topology; CMOS; active-RC filter; agile frequency tuning; approximation register counter; digital tuning loop; feedforward compensation; frequency 120 MHz; high data rate wireless receivers; wide-bandwidth operational amplifiers; wideband active-RC low-pass filter; Attenuation; Bandwidth; Broadband amplifiers; Counting circuits; Cutoff frequency; Low pass filters; Operational amplifiers; Topology; Tuning; Wideband;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
VLSI Design, Automation and Test, 2008. VLSI-DAT 2008. IEEE International Symposium on
Conference_Location :
Hsinchu
Print_ISBN :
978-1-4244-1616-5
Electronic_ISBN :
978-1-4244-1617-2
Type :
conf
DOI :
10.1109/VDAT.2008.4542449
Filename :
4542449
Link To Document :
بازگشت