Title :
Simple high-frequency CMOS transconductor
Author :
Singh, S.P. ; Hanson, J.V. ; Vlach, J.
Author_Institution :
Dept. of Electr. Eng., Waterloo Univ., Ont., Canada
fDate :
12/1/1990 12:00:00 AM
Abstract :
A new transconductor, using only two transistors, is presented. It is based on standard inverter configurations and does not need matching of nMOS and pMOS transistors or of the power supply voltages. Reduction in nonlinearity is achieved by maintaining a zero offset condition. The circuit is not affected by variations in body effect as sources and substrates are connected to fixed voltages. Although the inverter has a low signal level handling capability (≃300 mV for a total harmonic distortion of 1%), this can be improved by the use of two inverters. This leads to a larger dynamic range and has no noticeable effect on bandwidth. A wideband integrator is developed, based on the new transconductor, with independent adjustment of quality factor and unity-gain frequency
Keywords :
CMOS integrated circuits; frequency response; integrating circuits; linear integrated circuits; logic gates; network synthesis; CMOS transconductor; bandwidth; dynamic range; fixed voltages; inverter; inverter configurations; low signal level handling capability; nonlinearity reduction; quality factor; sources; substrates; total harmonic distortion; unity-gain frequency; wideband integrator; zero offset condition;
Journal_Title :
Circuits, Devices and Systems, IEE Proceedings G
