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High frequency GaAs switched capacitor filter implemented with GaAs insulated gate FET switches

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4 Author(s)
Luck, J.L. ; Dept. of Electron. & Electr. Eng., King's Coll., London, UK ; Taylor, J.T. ; Swanson, J.G. ; Haigh, D.G.

A switched capacitor filter implemented with 5 mu m GaAs IGFET switches and GaAs MESFET operational amplifiers is presented. The circuit is clocked at 25 MHz. By scaling to 1 mu m IGFETs, a switching speed of about 625 MHz should be attainable. Use of GaAs IGFET switches is shown to greatly reduce power consumption and complexity of the circuit. The low frequency switching instability of the GaAs IGFET is shown to be of no consequence in this application.

Published in:

Electronics Letters  (Volume:27 ,  Issue: 18 )