Title :
A 12th order active-RC filter with automatic frequency tuning for DVB Tuner applications
Author :
Zou, Liang ; Han, Kefeng ; Liao, Youchun ; Min, Hao ; Tang, Zhangwen
Author_Institution :
ASIC & Syst. State Key Lab., Fudan Univ., Shanghai
Abstract :
A 12th order active-RC filter for DVB Tuner applications with automatic frequency tuning (AFT) is presented in this paper. The filter is implemented in Butterworth biquad structure. The AFT circuit is introduced to compensate the frequency variation by a 7-bits switched-capacitor array. The measurement results indicate that the precision of tuning circuit can be controlled less than plusmn2.3%, the in-band group delay variation is 70 ns, and the in-band IM3 achieves -60 dB with -27 dbm input power. This proposed filter circuit, fabricated in a SMIC 0.18 mum CMOS process, consumes 6 mA current with 1.8 V power supply.
Keywords :
Butterworth filters; CMOS integrated circuits; RC circuits; biquadratic filters; circuit tuning; digital video broadcasting; switched capacitor filters; television receivers; 12th order active-RC filter; Butterworth biquad structure; DVB tuner applications; RF tuner receiver; SMIC CMOS process; automatic frequency tuning; current 6 mA; in-band group delay; size 0.18 mum; switched-capacitor array; voltage 1.8 V; Automatic control; Automatic frequency control; Circuit optimization; Delay; Digital video broadcasting; Filters; Power measurement; Switching circuits; Tuners; Tuning;
Conference_Titel :
Solid-State Circuits Conference, 2008. A-SSCC '08. IEEE Asian
Conference_Location :
Fukuoka
Print_ISBN :
978-1-4244-2604-1
Electronic_ISBN :
978-1-4244-2605-8
DOI :
10.1109/ASSCC.2008.4708782
