Title :
A CMOS digitally tunable transconductor for video frequency operation [programmable filter applications]
Author :
Calvo, B. ; Sanz, M.T. ; Celma, S. ; Martínez, P.A.
Author_Institution :
Group of Electron. Design, Zaragoza Univ., Spain
Abstract :
In this paper, a widely tunable MOS transconductor, based on a degenerated differential pair architecture, is presented for applications in low-voltage video frequency filtering. Integrators with a phase error at unity-gain frequency lower than -0.5° are obtained by using a compensation technique. As an application, a current-mode biquad has been designed in a 0.8 μm 3.3 V CMOS process, with frequency programmability from 3.76 to 27.49 MHz and dynamic range better than 45 dB over the complete tuning range.
Keywords :
CMOS analogue integrated circuits; biquadratic filters; circuit feedback; circuit simulation; circuit tuning; compensation; current-mode circuits; integrated circuit design; integrating circuits; low-power electronics; programmable filters; radiofrequency filters; video signal processing; 0.8 micron; 3.3 V; 3.76 to 27.49 MHz; CMOS digitally tunable transconductor; compensation technique; current-mode biquad filter; degenerated differential pair architecture; dynamic range; frequency programmability range; integrators; low-voltage filtering; positive feedback; programmable filtering; tunable MOS transconductor; tuning range; unity-gain frequency phase error; video frequency filtering; CMOS technology; Digital filters; Dynamic range; Filtering; Frequency; Linearity; Low pass filters; Transconductance; Transconductors; Tuning;
Conference_Titel :
Circuits and Systems, 2003. ISCAS '03. Proceedings of the 2003 International Symposium on
Print_ISBN :
0-7803-7761-3
DOI :
10.1109/ISCAS.2003.1205624
