Apparatus and method for improved dynamic range

Details Apparatus and method for improved dynamic range Apparatus and method for improved dynamic range

1998-04-08

2000-05-23

Le, Dinh T.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Logarithmic

327351, 327337, 327512, G06F 7556, G06F 712

Patent

active

060669764

ABSTRACT:
A logarithmic amplifier is provided with a calibration circuit to allow for current measurement over a wide-dynamic range that includes extremely low current levels in a manner which mitigates or eliminates sensitivity to temperature. Calibration currents are generated by application of a series of voltage ramps of selectable slope to a capacitor. This provides a set of known current levels, selectable over a range of decades, for periodic calibration of the logarithmic amplifier. The selectable calibration currents can also be advantageously used to provide a fixed, known bias current to the input of the logarithmic amplifier to improve the response time of the amplifier for measurement of small sensor currents on the order of 10-100 fA.

REFERENCES:
patent: 3879668 (1975-04-01), Edwards
patent: 3971984 (1976-07-01), Bench
patent: 4122529 (1978-10-01), Hoech
patent: 4408128 (1983-10-01), Fujita
patent: 5241282 (1993-08-01), Poole

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