MOSFET_INPUT_BUFFER

Published:2009/6/30 1:42:00 Author:May | From:SeekIC

Uses Motorola MC14007 dual complementary pair plus inverter, with two of MOSFETs connected as differential amplifier for buffering opamp and third serving as current source for differential amplifier. Arrangement gives high input impedance required in some applications of MC1505 A/D converter for which buffer was designed. 1-megohm pot controls gate voltage for current source. Temperature drift is well under 2 mV over range of 0-50℃. Pin 14 of MC14007 should be tied to +5 V.—D. Aldridge and S. Kelley, Input Buffer Circuits for the MC1505 Dual Ramp A-to-D Converter Subsystem, Motorola, Phoenix, AZ, 1976, EB-24A.



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