VOLTAGE_CONTROLLED_BANDPASS

Published:2009/7/2 9:14:00 Author:May | From:SeekIC

Two Optical Electronics S898 four-quadrant analog multipliers and 3704 state-variable active filter permit use of voltage control for changing filter characteristics remotely without having noise pickup problems on control Iines. Analog multipliers serve as variable-gain blocks that change cument levels in resistors and in effect change resistor values. Circuit has Iinear relationship of frequency to control voltage, constant gain andQwith frequency, and good temperature stability.- Voltage-Controll ed Active Bandpass Filter, Optical Electronics, Tucson, AZ, Application Tip 10269.



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