Title :
A 4–40MHz continuous-time LPF with on chip automatic tuning for a direct conversion DBS Tuner
Author :
Chen, Bei ; Chen, Fangxiong ; Ma, Heping ; Shi, Yin ; Dai, Fa Foster
Author_Institution :
Semicond. Integrated Technol. Res. Center, Chinese Acad. of Sci., Suzhou
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 um SiGe BiCMOS technology. The filterpsilas -3dB cutoff frequency f0 can be programmed from 4 MHz to 40 MHz. Measurement results show that the filter has 0 dB passband gain, 30 nV/Hzfrac12 input referred noise, -3 dBVrms passband IIP3, 27 dBVrms stopband IIP3. The I/Q LPFs with the tuning circuit draw 13 mA (with f0=20 MHz) from 5 V supply, and occupy an area of 0.5 mm2.
Keywords :
BiCMOS integrated circuits; Butterworth filters; Ge-Si alloys; VHF filters; circuit tuning; continuous time filters; low-pass filters; semiconductor materials; BiCMOS technology; SiGe; chip automatic tuning circuit; continuous-time 7th-order Butterworth Gm-C low pass filter; continuous-time LPF; current 13 mA; cutoff frequency; direct conversion DBS Tuner; frequency 4 MHz to 40 MHz; passband gain; size 0.35 mum; voltage 5 V; BiCMOS integrated circuits; Circuit optimization; Germanium silicon alloys; Low pass filters; Passband; Satellite broadcasting; Silicon germanium; Tuned circuits; Tuners; Tuning; Active filters; Butterworth filters; Direct broadcast satellite (DBS) tuner; Gm-C filters; SiGe BiCMOS; continuous-time filters; on chip automatic tuning;
Conference_Titel :
Bipolar/BiCMOS Circuits and Technology Meeting, 2008. BCTM 2008. IEEE
Conference_Location :
Monteray, CA
Print_ISBN :
978-1-4244-2725-3
Electronic_ISBN :
1088-9299
DOI :
10.1109/BIPOL.2008.4662703
