Active circuit trimming with AC and DC response trims relative t

Details Active circuit trimming with AC and DC response trims relative t Active circuit trimming with AC and DC response trims relative t

1992-08-28

1995-05-30

Wieder, Kenneth A.

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

Calibration

324130, 36457101, G01R 3500

Patent

active

054205158

ABSTRACT:
An electronic probe circuit having ac and dc amplifiers and an input compensation subcircuit is enclosed within a trim housing that replicates the electrical effect of the probe housing. The circuit is laser trimmed through ports in the trim housing. The difference between the voltage at 80 nsec and 1.4 .mu.sec points on a step voltage provides a first calibration factor while the difference between the 3 nsec voltage and the 80 nsec voltage provides a second calibration factor. A resistor in the DC amplifier is trimmed to an absolute voltage with a step scan laser cut. A resistor in the AC amplifier is trimmed with a laser L-cut until the difference between the 80 nsec and 1.4 .mu.sec points of the step voltage equals the first calibration factor. A capacitor in the input compensation subcircuit is trimmed until the voltage difference between the 3 nsec and 80 nsec points equals the second calibration factor.

REFERENCES:
patent: 3988824 (1976-11-01), Bodway
patent: 4799008 (1989-01-01), Kannari
patent: 4854728 (1989-08-01), Baron et al.
patent: 4859936 (1989-08-01), Eccleston
patent: 4901006 (1990-02-01), Harrison et al.
patent: 4933631 (1990-01-01), Eccleston
patent: 5012181 (1991-04-01), Eccleston
Ramirez-Angulo et al, "Improvement of Laser Trimmed Film Resistor Stability By Selection of Optimal Trim Paths"; Jun. 1991; 1991 IEEE Symp. on Cirs and Sys.; pp. 2188-2191 vol. 4.

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