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Digitally tuned analogue integrated filters using R-2R ladder

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2 Author(s)
Alzaher, H.A. ; Dept. of Electr. Eng., Ohio State Univ., Columbus, OH, USA ; Ismail, M.

A new technique for designing digitally tuned frequency selective analogue integrated circuits is proposed. The technique incorporates the R-2R ladder as a circuit element into the circuit design to provide precise frequency characteristics that can be tuned over a wide range. Two filters are described to illustrate the proposed approach. The proposed filters are used to implement the lowpass channel-select filter of a multi-standard direct conversion wireless receiver and the bandpass filter of a low IF frequency-hopping receiver

Published in:

Electronics Letters  (Volume:36 ,  Issue: 15 )