Title :
Design and optimisation of a GaAs switched capacitor filter
Author :
Haigh, D.G. ; Toumazou, Christofer ; Harrold, S.J. ; Sewell, J.I. ; Steptoe, K.
Author_Institution :
Dept. of Electron. & Electr. Eng., Univ. Coll., London, UK
Abstract :
Consideration is given to a GaAs second-order switched-capacitor bandpass filter. The design incorporates a new switched 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 capacitive 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; active filters; band-pass filters; field effect integrated circuits; gallium arsenide; linear integrated circuits; radiofrequency filters; switched capacitor filters; 20 MHz; 500 MHz; GaAs; RF filter; SC filter; amplifier loading; bandpass filter; buffer; capacitive loads; cascode operational amplifiers; high gain single stage op amps; midband frequency; offchip load driving; optimisation; second-order; switched capacitor filter; switched driver circuit; switching frequency; Band pass filters; Design optimization; Driver circuits; Fabrication; Gallium arsenide; Geometry; Operational amplifiers; Switched capacitor circuits; Switches; Switching circuits;
Conference_Titel :
Circuits and Systems, 1989., IEEE International Symposium on
Conference_Location :
Portland, OR
DOI :
10.1109/ISCAS.1989.100630
