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Absolute-value circuit using junction field-effect transistors

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1 Author(s)
Ciubotaru, A.A. ; Maxim Integrated Products, Melbourne Design Center, FL, USA

A novel configuration for an absolute-value circuit (full-wave rectifier with zero threshold) using two matched junction field-effect transistors is proposed and experimentally demonstrated. The zero-threshold rectification is accompanied by a scaling of the input signal by a theoretical factor of 1/√2, and is achieved by mathematically exploiting the nonlinear characteristics of the transistors. The circuit operates with complementary input signals and requires a dc bias voltage for the transistor gates. Negative or positive output voltages can be obtained by using either n- or p-channel devices.

Published in:

Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on  (Volume:50 ,  Issue: 8 )