Title :
Design and optimisation of a GaAs switched capacitor filter
Author :
Haigh, D.G. ; Toumazou, C. ; Harrold, S.J. ; Sewell, J.I.
Author_Institution :
Dept. of Electron. & Electr. Eng., Univ. Coll. London, UK
Abstract :
Discusses a GaAs 2nd order switched capacitor bandpass filter. The design incorporates a new switch driver circuit and a new buffer for driving off-chip loads. The geometries of the high gain, single-stage cascode operational amplifiers are scaled in relation to the particular capacitative loads they experience. Also, the switched capacitor circuit is modified to ensure that amplifier loading is suitable in all switch phases. The circuit has been submitted for fabrication and is expected to achieve a midband frequency of 20 MHz using a switching frequency of 500 MHz
Keywords :
III-V semiconductors; band-pass filters; field effect integrated circuits; gallium arsenide; network synthesis; switched capacitor filters; 20 MHz; 500 MHz; GaAs; amplifier loading; bandpass filter; buffer; capacitative loads; driving off-chip loads; geometries; midband frequency; optimisation; scaling; semiconductors; single-stage cascode operational amplifiers; switch driver circuit; switched capacitor filter; switching frequency;
Conference_Titel :
Electronic Filters, IEE 1988 Saraga Colloquium on
Conference_Location :
London
