Title :
A CMOS digitally programmable current steering semidigital FIR reconstruction filter
Author :
Aga, Arshaiz ; Roberts, Gordon W.
Author_Institution :
Microelectron. & Computer Syst. Lab., McGill Univ., Montreal, Que., Canada
Abstract :
A low power, area efficient, single bit finite-impulse response (FIR) reconstruction filter for delta-sigma applications based on a current steering approach is presented. The FIR filter coefficients are programmable with discrete values from -8 to +8, thus allowing for various filter responses including lowpass and bandpass transfer functions on the same chip. The filter is implemented in a 0.25 μm standard CMOS process and incorporates 2.09 mm2 of active area and a 2.5 V supply. Three different filter functions are implemented: a voice band lowpass filter, an audio band lowpass filter and a bandpass filter. The audio band example achieves a dynamic range of 78 dB for a signal bandwidth of 20 kHz and 65 dB over a 100 kHz bandwidth
Keywords :
CMOS integrated circuits; FIR filters; band-pass filters; digital filters; low-pass filters; low-power electronics; mixed analogue-digital integrated circuits; programmable filters; transfer functions; 0.25 micron; 2.5 V; 20 to 100 kHz; CMOS digitally programmable filter; FIR filter coefficients; area efficient design; audio band lowpass filter; bandpass filter; bandpass transfer functions; current steering filter; delta-sigma applications; finite-impulse response; low power operation; lowpass transfer functions; semidigital FIR reconstruction filter; standard CMOS process; voice band lowpass filter; Band pass filters; Bandwidth; Circuit testing; Digital filters; Dynamic range; Finite impulse response filter; IIR filters; Robustness; Signal processing; Transfer functions;
Conference_Titel :
Circuits and Systems, 2001. ISCAS 2001. The 2001 IEEE International Symposium on
Conference_Location :
Sydney, NSW
Print_ISBN :
0-7803-6685-9
DOI :
10.1109/ISCAS.2001.921817
