Title :
A widely tunable continuous-time LPF for a direct conversion DBS Tuner
Author :
Bei Chen ; Fangxiong Chen ; Heping ma ; Yin Shi ; Dai, Fa Foster
Author_Institution :
Inst. of Semicond., Chinese Acad. of Sci., Beijing, China
Abstract :
A continuous-time 7th-order Butterworth Gm-C low pass filter (LPF) with on-chip automatic tuning circuit has been implemented for a direct conversion DBS tuner in a 0.35 ¿m SiGe BiCMOS technology. The filter¿s -3 dB cutoff frequency f0 can be tuned from 4 MHz to 40 MHz. A novel translinear transconductor (Gm) cell is used to implement the widely tunable and high linear filter. The filter has -0.5 dB passband gain, 28 nV/Hz1/2 input referred noise, -2 dB Vrms passband IIP3, 24 dB Vrms stopband IIP3. The I/Q LPFs with the tuning circuit draw 16 mA (with f0=20 MHz) from 3.3 V supply, and occupy an area of 0.45 mm2.
Keywords :
BiCMOS integrated circuits; Butterworth filters; Ge-Si alloys; circuit tuning; direct broadcasting by satellite; low-pass filters; 7th-order Butterworth Gm-C low pass filter; BiCMOS technology; Si-Ge; current 16 mA; cutoff frequency; direct broadcast satellite; direct conversion DBS Tuner; frequency 4 MHz to 40 MHz; input referred noise; on-chip automatic tuning circuit; passband gain; size 0.35 mum; translinear transconductor cell; voltage 3.3 V; widely tunable continuous-time LPF; Circuit optimization; Germanium silicon alloys; Low pass filters; Nonlinear filters; Passband; Satellite broadcasting; Silicon germanium; Tunable circuits and devices; Tuned circuits; Tuners;
Conference_Titel :
Solid-State and Integrated-Circuit Technology, 2008. ICSICT 2008. 9th International Conference on
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-2185-5
Electronic_ISBN :
978-1-4244-2186-2
DOI :
10.1109/ICSICT.2008.4734889
