Title :
A Multirate Switched-Current Filter Using Class-AB Cascoded Memory
Author :
Worapishet, Apisak ; Sitdhikorn, Rungsimunt ; Spencer, Adrian ; Hughes, John B.
Author_Institution :
Mahanakorn Microelectron. Res. Center, Mahanakorn Univ. of Technol., Bangkok
Abstract :
Switched-current (SI) techniques for modern short-range wireless filters are described. The cascoded Class-AB SI is employed for improved memory accuracy with minimum loss of overall performance. With emphasis on low power, a multirate SI scheme that features order reduction and simple interfacing of the continuous-time anti-alias filter to the sampled data SI filter is introduced. Implemented using a 3-V 0.35-mum digital CMOS process, the fifth-order complex bandpass SI filter was designed and optimized at 2.0-V supply voltage for Bluetooth application with 1-MHz center frequency and 1.2-MHz bandwidth. It has a voltage gain of 20.5 dB and achieves an image rejection of 45 dB, a spurious-free dynamic range of 64 dB and the signal-to-noise ratio of 67 dB
Keywords :
band-pass filters; continuous time filters; integrated circuit design; low-power electronics; switched current circuits; switched filters; 0.35 micron; 1 MHz; 1.2 MHz; 2 V; 20.5 dB; 3 V; Bluetooth application; bandpass SI filter; class-AB cascoded memory; continuous-time antialias filter; multirate switched-current filter; order reduction; short-range wireless filters; Band pass filters; Bandwidth; Bluetooth; CMOS process; Design optimization; Digital filters; Frequency; Gain; Performance loss; Voltage; Class-AB technique; SI technique; switched-current (SI) filter;
Journal_Title :
Circuits and Systems II: Express Briefs, IEEE Transactions on
DOI :
10.1109/TCSII.2006.882852
