Title :
A 2MHz CMOS Gm-C complex filter with on-chip automatic tuning for wireless sensor networks application
Author :
Wan, Chuanchuan ; Li, Zhiqun
Author_Institution :
Inst. of RF-&OE-ICs, Southeast Univ., Nanjing, China
Abstract :
A gm-C complex filter with on-chip automatic tuning for wireless sensor networks (WSN) is designed using 0.18¿m RF CMOS process. This filter is synthesized from a low-pass 5th-order Chebyshev RLC ladder filter prototype by means of capacitors and fully balanced transconductors with extended linear range. A conventional phase-locked loop (PLL) is used to realize the on-chip automatic tuning for both center frequency and bandwidth control. The filter bandwidth is 2.4 MHz and is centered at 2 MHz. The image band rejection is higher than 63 dB while the ripple in the passband is less than 0.5 dB. The complete filter including on-chip tuning circuit consumes less than 5 mA with 1.8V single supply voltage.
Keywords :
CMOS analogue integrated circuits; Chebyshev filters; circuit tuning; complex networks; ladder filters; low-pass filters; phase locked loops; radiofrequency filters; radiofrequency integrated circuits; wireless sensor networks; Gm-C complex filter; RF CMOS process; frequency 2 MHz; image band rejection; linearized transconductor; low-pass 5th-order Chebyshev RLC ladder filter; on-chip automatic tuning; phase-locked loop; size 0.18 mum; wireless sensor networks application; Band pass filters; Bandwidth; CMOS process; Circuit optimization; Network synthesis; Network-on-a-chip; Nonlinear filters; Phase locked loops; Radio frequency; Wireless sensor networks; automatic tuning; complex filter; gm-C; linearized transconductor; wireless sensor networks (WSN);
Conference_Titel :
Communications, 2009. APCC 2009. 15th Asia-Pacific Conference on
Conference_Location :
Shanghai
Print_ISBN :
978-1-4244-4784-8
Electronic_ISBN :
978-1-4244-4785-5
DOI :
10.1109/APCC.2009.5375657
