Title :
A 2 V low-distortion CMOS biquadratic cell
Author :
Python, Dominique ; Enz, Christian
Author_Institution :
Electron. Lab., Fed. Inst. of Technol., Lausanne, Switzerland
Abstract :
This paper presents a fully differential CMOS biquadratic cell using an active-C integrator at a 2 V supply voltage. An operational transconductance amplifier is used based on grounded MOS transistors biased in the triode region by a simple current conveyor. DC measurements validate the high linearity of the transconductor. The transconductor achieves inherently a high transconductance to current ratio which can be further increased by degenerating the current conveyor. The integrator does not require any additional input common-mode rejection circuit and has an inherent output common-mode stabilization circuit, making it very compact. The biquadratic cell shows a total harmonic distortion of -60 dB for a 500 kHz 1 Vpp signal. The power dissipation per pole is 300 μW
Keywords :
CMOS analogue integrated circuits; biquadratic filters; circuit stability; current conveyors; differential amplifiers; harmonic distortion; integrating circuits; operational amplifiers; 2 V; 300 muW; 500 kHz; CMOS biquadratic cell; active-C integrator; current conveyor; fully differential circuits; grounded MOS transistors; linearity; operational transconductance amplifier; output common-mode stabilization circuit; power dissipation; total harmonic distortion; transconductance to current ratio; CMOS technology; Integrated circuit measurements; Laboratories; Linearity; MOSFETs; Operational amplifiers; Power dissipation; Transconductance; Transconductors; Voltage;
Conference_Titel :
Circuits and Systems, 1998. ISCAS '98. Proceedings of the 1998 IEEE International Symposium on
Conference_Location :
Monterey, CA
Print_ISBN :
0-7803-4455-3
DOI :
10.1109/ISCAS.1998.704207
