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Variable gain amplifiers based on a new approximation method to realize the exponential function

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2 Author(s)
K. M. Abdelfattah ; Dept. of Electr. Eng., California Univ., Los Angeles, CA, USA ; A. M. Soliman

A new current mode variable-gain amplifier (VGA) is developed. The new circuit is based on a novel approximation function that is very close to the ideal exponential relation over a very wide range. Pspice simulations are provided based on Mietec 0.5-μm CMOS technology. The simulations show that the dynamic range achieved is over 50 dB in a single stage. The proposed circuit consumes average power less than 1.2 mW using ±1.5 V supply voltages.

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IEEE Transactions on Circuits and Systems I: Fundamental Theory and Applications  (Volume:49 ,  Issue: 9 )