Title :
Programmable CMOS switched-capacitor biquad using quasi-passive algorithmic DAC´s
Author :
Paulino, Nuno ; Franca, José E. ; Martins, F.P.
Author_Institution :
Integrated Circuits & Syst. Group, Inst. Superior Tecnico, Lisbon, Portugal
fDate :
6/1/1995 12:00:00 AM
Abstract :
This paper describes an electrically programmable switched-capacitor (SC) biquad using quasi-passive algorithmic digital-to-analog converters (DAC´s). Since only two equal-valued capacitors are needed for programming each capacitance value, the proposed technique offers compact, cost-effective programmability when compared to traditional programming techniques employing binary-weighted capacitor-arrays (C-arrays). A demonstration prototype chip realized in a 1.2 μm CMOS double-metal double-poly technology, and which implements an 8 b programmable SC biquad giving a wide range of lowpass, bandpass and highpass filtering functions, occupies an active area of only 0.38 mm2
Keywords :
CMOS integrated circuits; band-pass filters; biquadratic filters; digital-analogue conversion; high-pass filters; low-pass filters; mixed analogue-digital integrated circuits; programmable filters; switched capacitor filters; 1.2 micron; 8 bit; CMOS double-metal double-poly technology; active area; bandpass filtering functions; binary-weighted capacitor-arrays; capacitance value; equal-valued capacitors; highpass filtering functions; lowpass filtering functions; programmable CMOS switched-capacitor biquad; quasi-passive algorithmic DACs; Band pass filters; CMOS technology; Capacitance; Digital-analog conversion; Filtering; Manufacturing; Prototypes; Pulse circuits; Switched capacitor networks; Switches;
Journal_Title :
Solid-State Circuits, IEEE Journal of
