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CMOS current-mode exponential-control variable-gain amplifier

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3 Author(s)
Chang, C.-C. ; Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei, Taiwan ; Lin, M.-L. ; Liu, S.-I.

A CMOS current-mode exponential-control variable-gain amplifier is presented. It consists of a first-order current-mode pseudo-exponential circuit and a current-mode multiplier. Based on the Taylor's series expansion, the pseudo-exponential circuit can be realised by MOSFETs in saturation. The proposed circuit has been fabricated in a 0.5 μm n-well CMOS process with a gain control range of 15 dB. The experimental results confirm the feasibility of the proposed variable-gain amplifier

Published in:

Electronics Letters  (Volume:37 ,  Issue: 14 )