Title :
A Versatile Low-voltage CMOS Pseudo-Differential Transconductor with Improved Linearity
Author :
Calvo, B. ; Celma, S. ; Sanz, M.T. ; Ramirez-Angulo, Jaime
Author_Institution :
Group of Electron. Design, Zaragoza Univ., Zaragoza
Abstract :
In this paper a pseudo-differential continuous-time CMOS transconductor suitable for applications in low-voltage systems over the high frequency range is presented. The basis is to split each transistor in the classical fully balanced grounded pair into two matched transistors that form differential pairs. This makes possible to maintain constant the input common mode voltage, keeping it independently of the continuous transconductance adjustment. Results for a 0.5 mum CMOS design show a moderate Gmmiddot tunability range with an almost constant bandwidth over 400 MHz, while total harmonic distortion figures are kept below -60 dB over the whole gain range at 10 MHz up to a 100 muAp-p differential output. The proposed transconductor, compatible with purely digital processes, is very compact in terms of silicon area and consumes less than 1.5 mW from a single 2.7 V supply.
Keywords :
CMOS analogue integrated circuits; MOSFET circuits; continuous systems; harmonic distortion; integrated circuit design; low-power electronics; silicon; CMOS design; classical fully balanced grounded pair; continuous-time CMOS transconductor; differential output; frequency 10 MHz; input common mode voltage; low-voltage CMOS pseudodifferential transconductor; low-voltage systems; matched transistors; silicon area; size 0.5 mum; total harmonic distortion; voltage 2.7 V; CMOS technology; Circuits; Filters; Frequency; Linearity; MOSFETs; Operational amplifiers; Threshold voltage; Transconductance; Transconductors;
Conference_Titel :
Circuits and Systems, 2006. MWSCAS '06. 49th IEEE International Midwest Symposium on
Conference_Location :
San Juan
Print_ISBN :
1-4244-0172-0
Electronic_ISBN :
1548-3746
DOI :
10.1109/MWSCAS.2006.382310