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Current-input current-output CMOS logarithmic amplifier based on translinear Ohm??s law

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2 Author(s)
Huang, C. ; Dept. of Electr. & Comput. Eng., Michigan State Univ., East Lansing, MI, USA ; Chakrabartty, S.

State-of-the-art logarithmic amplifiers use a transimpedance technique based on the exponential dependence between input current and output voltage as exhibited by p-n junction diodes, bipolar transistors and MOS transistors in the subthreshold region. Presented is a CMOS current-input current-output logarithmic amplifier based on a translinear Ohm's law principle which involves a floating voltage source and a passive resistor embedded within a translinear loop. It is demonstrated that the input'output range of the proposed logarithmic amplifier can be controlled using a reference bias and the response of the amplifier can be temperature compensated using a PTAT and a resistive cancellation technique.

Published in:

Electronics Letters  (Volume:47 ,  Issue: 7 )