Title :
A 5th-order switched-capacitor complex filter for low-IF narrowband wireless receivers
Author :
Suzuki, Kenji ; Ugajin, Mamoru ; Harada, Mitsuru
Author_Institution :
NTT Network Innovation Labs., NTT Corp., Yokosuka, Japan
Abstract :
A 5th-order switched-capacitor (SC) complex filter is implemented in 0.2-¿m CMOS technology. In order to reduce the die size and current consumption of the complex filter, a novel SC integrator is developed. The filter is centered at 24.8 kHz with bandwidth of 20.2 kHz. The Image channel is attenuated by more than 40 dB. The in-band 3rd order harmonic input intercept point (IIP3) is 15 dBm and the in-band output noise is 70 ¿Vrms. The complex filter consumes 350 ¿A with a 2.0-V power supply. The die size of the fabricated filter is 0.578 mm2. Owing to the proposed SC integrator, the fabricated filter achieved 27% reduction in die size without any characteristic degradation, including noise performance, compared to the conventional equivalent.
Keywords :
CMOS integrated circuits; radio receivers; switched capacitor filters; 5th order switched-capacitor complex filter; CMOS technology; SC integrator; bandwidth 20.2 kHz; bandwidth 24.8 kHz; current 350 muA; gain 15 dB; gain 40 dB; image channel; in-band 3rd order harmonic input intercept point; low-IF narrowband wireless receivers; voltage 2 V; CMOS technology; Circuit noise; Degradation; Frequency; Laboratories; Narrowband; Noise reduction; Power harmonic filters; Transceivers; Wireless sensor networks; BPF; CMOS; Complex filters; Low-IF; low-power; switched-capacitor circuits;
Conference_Titel :
Radio and Wireless Symposium (RWS), 2010 IEEE
Conference_Location :
New Orleans, LA
Print_ISBN :
978-1-4244-4725-1
Electronic_ISBN :
978-1-4244-4726-8
DOI :
10.1109/RWS.2010.5434120
