Method and apparatus for testing operational amplifier leakage c

Details Method and apparatus for testing operational amplifier leakage c Method and apparatus for testing operational amplifier leakage c

1986-06-05

1987-09-29

LaRoche, Eugene R.

Amplifiers

With amplifier condition indicating or testing means

324123R, G01R 1900

Patent

active

046971513

ABSTRACT:
A circuit for measuring the leakage current of an electrometer amplifier 10 determines the leakage currents at both amplifier input terminals simultaneously by a method that eliminates the effects of the amplifier offset voltage as well as of the offset voltages and leakage currents of the amplifiers (22 and 40) used in the measurement. With no amp. under test present in the circuit, measurements are made of the outputs of the two test-circuit amplifiers (22 and 40). This results in quantities that indicate the required compensation for the offset voltages and leakage currents of the test-circuit amplifiers. From then on, measurements are made of the amplifier output voltages with an amp. under test present and the leakage currents at both input terminals of said amplifier 10 under test can be inferred from these second measurements by using the information obtained from the first set of measurements. Subsequent tests of other amplifiers under test can be made without re-measurement of the compensation information obtained with no amplifier under test present.

REFERENCES:
patent: 3845401 (1974-10-01), Troiani et al.
patent: 3989959 (1976-11-01), Renirie et al.
Plassmann, Wilfred and Gloe, K. H., "Measuring Instrument for Op Amp Characteristics", Elektronik, v. 28, No. 5, pp. 66-69.

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