Title :
Digitally programmable MOS resistive circuit
Author :
Alarcón, E. ; Martínez, H. ; Vidal, E. ; Poveda, A.
Author_Institution :
Dept. of Electron. Eng., Univ. Politecnica de Catalunya, Barcelona, Spain
fDate :
1/3/2002 12:00:00 AM
Abstract :
A mixed-signal cell is presented which operates as a digitally-controlled differential resistor and is suited to programmable continuous-time MOSFET-C filter applications. The cell is based on a digitally-controlled extension of the MOS resistive circuit (MRC) cell, in which digital tunability is obtained by embedding in the MRC transistors both the triode-region and switch functionalities, providing a compact implementation that preserves circuit performance. Post-layout simulation results for a 3-bit prototype in 0.8 μm CMOS technology validate the feasibility of the proposed cell and its application to a digitally-tunable continuous-time MOSFET-C filter
Keywords :
CMOS integrated circuits; Q-factor; band-pass filters; circuit tuning; continuous time filters; mixed analogue-digital integrated circuits; programmable circuits; programmable filters; CMOS technology; Q-factor; aspect-ratio binary-weighted transistors; bandpass filter; biased digital inverters; compact implementation; differential transconductor; digital tunability; digitally programmable MOS resistive circuit; digitally-controlled differential resistor; functionalities; mixed-signal cell; mixed-signal controllability; post-layout simulation; programmable continuous-time MOSFET-C filter; switch functionalities; triode-region;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20020016
