Title :
Novel tunable GaAs MESFET OTA-C integrators suitable for high precision filtering applications
Author :
Visocchi, P. ; Taylor, J. ; Betts, A. ; Haigh, D.
Author_Institution :
Dept. of Electron. & Electr. Eng., Univ. Coll., London, UK
Abstract :
The design of novel, differential input operational-transconductance-amplifier (OTA-C) integrators for realization in 0.5-μm, 20-GHz GaAs MESFET technology is described. It is shown that due to certain unique features of the single-ended OTA, extension to a fully balanced differential form requires considerably less than doubling of the number of components. The circuits, which feature separate control of gain and cutoff frequency, are particularly suited to high-precision, very-high-Q filtering applications. The fully balanced integrator is very linear, and searching tests conducted over a wide range of transconductance and operating conditions reveal that the total harmonic distortion levels are low
Keywords :
III-V semiconductors; MMIC; Schottky gate field effect transistors; active filters; active networks; differential amplifiers; field effect integrated circuits; gallium arsenide; integrating circuits; microwave amplifiers; operational amplifiers; radiofrequency filters; tuning; 0.5 micron; 20 GHz; GaAs; balanced integrator; continuous time filters; differential input; features; operational-transconductance-amplifier; precision filtering; semiconductors; total harmonic distortion levels; Bandwidth; CMOS technology; Circuits; Dynamic range; Filtering; Frequency; Gallium arsenide; MESFETs; Transconductance; Tuning;
Conference_Titel :
Circuits and Systems, 1992. ISCAS '92. Proceedings., 1992 IEEE International Symposium on
Conference_Location :
San Diego, CA
Print_ISBN :
0-7803-0593-0
DOI :
10.1109/ISCAS.1992.229976
