VOLTAGE_CONTROL

Published:2009/7/14 4:09:00 Author:May | From:SeekIC

Improved voltage-con-trolled current source uses complementary transistors in opamp feedback loop. Common-mode voltage at input to opamp is always near zero. Circuit was designed for use in integrator having ground-referenced integrating capacitor, to produce 1 mA/V. R3a and R3b sense current through Q1 and Q2 so voltage proportional to difference is fed back to input of opamp for comparison with input voltage. Zener voltages determine quiescent-current level. Frequency response is limited to 1 MHz by performance of specified opamp.-P. T. Skelly, Voltage-Con-trolled Current Source, EDN/EEE Magazine, Aug. 1, 1971, p 45-46.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Control_Circuit/VOLTAGE_CONTROL.html

Print this Page | Comments | Reading(3)