Title :
A 70–280 MHz frequency and Q tunable 53 dB SFDR Gm-C filter for ultra-wideband
Author :
Li, Weinan ; Huang, Yumei ; Hong, Zhiliang
Author_Institution :
ASIC & Syst. State Key Lab., Fudan Univ., Shanghai, China
Abstract :
A 70-280 MHz 5th-order Chebyshev Gm-C low-pass filter was implemented in 0.13μm CMOS process to support both WiMedia UWB and lower rate IR-UWB applications. The filter response is accurately maintained over 4× frequency range by using unit Gm cell arrays and independent Q tuning circuit. To improve linearity of Gm-C filter in low supply voltage, a modified LC ladder topology is proposed. The IIP3 performance is improved more than 10 dB compared to conventional Gm-C filter. A measured spurious free dynamic range (SFDR) of more than 50 dB is maintained when the filter cut-off frequency is programmed. It occupies an area of 0.12 mm2 and consumes 21 mW under supply of 1.5 V.
Keywords :
CMOS integrated circuits; Q-factor; ladder filters; low-pass filters; 5th-order Chebyshev Gm-C low-pass filter; CMOS process; LC ladder topology; Q tuning circuit; filter response; frequency 70 MHz to 280 MHz; power 21 mW; size 0.13 mum; spurious free dynamic range; voltage 1.5 V; CMOS integrated circuits; Cutoff frequency; Frequency measurement; Linearity; Low pass filters; Topology; Tuning;
Conference_Titel :
Solid State Circuits Conference (A-SSCC), 2010 IEEE Asian
Conference_Location :
Beijing
Print_ISBN :
978-1-4244-8300-6
DOI :
10.1109/ASSCC.2010.5716608
