High input impedance buffer with low feedback resistance

Details High input impedance buffer with low feedback resistance High input impedance buffer with low feedback resistance

1993-06-15

1994-07-26

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With amplifier or space discharge device

324115, G01R 130, G01R 1508

Patent

active

053329635

ABSTRACT:
A high input impedance AC buffer for use in an instrument that does not require high frequency compensation or calibration. An op-amp receives an input signal that is to be measured via a high resistance input resistor and produces an output signal proportional to the input signal. A feedback resistor block and a feedback attenuator form the feedback path of the buffer and establish buffer gain. The low resistances of the feedback block and the feedback attenuator are substantially less than the resistance of the high resistance input resistor, precluding the need for compensation and calibration capacitors. A switching circuit operates to select resistors in the feedback resistance block and the feedback attenuator to provide predetermined gains for the buffer.

REFERENCES:
patent: 3524135 (1970-08-01), Nercessian
patent: 3778710 (1973-12-01), Snook
patent: 3836852 (1974-09-01), Ross

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