Analogic Corporation

Roger Finch

Hans J Weedon

Enrico Dolazza

A system for and method of compensating for performance differences in a set of information channels is disclosed. The system and method model each channel as linear and characterizes the channel by an offset and a gain. The system includes memory for storing the offsets and gains associated with the N channels. The system further includes means for mathematically adjusting the output of each information channel by that channel's associated offset and gain. The system further includes filters for reducing the effect of random noise on the measurements of the offsets and gains by generating signals representative of time weighted averages of the offsets and gains.

Continuous self-calibrating data acquistion system

The invention is an autozero compensator for use in processing low level signals, the compensator comprising an input integrating operational amplifier providing at its output in one mode an error signal responsively to offset voltage across the differential input terminals of the amplifier. A second amplifier is provided in a feedback loop for generating from the error signal a charge at a compensating voltage equal and opposite to the offset voltage. That charge is capacitively stored and applied to the input amplifier to cancel the offset voltage.

Apparatus for and method of autozeroing the input of a charge-to-voltage

The invention is an autozeroing circuit for use in processing low level electrical charge signals by an integrating operational amplifier. The autozeroing circuit includes a switching circuit that periodically charges and discharges the integrating capacitor of the amplifier during set and reset phases of an operation cycle so that during the set phase of the cycle the input signal is integrated and processed by processing circuitry including an A/D converter, and during the reset phase the integrator is cleared. The circuit includes a storage capacitor connected between the output of the operational amplifier of the integrator and the input to the processing circuitry, and a switch selectively operable to clamp the input of the processing circuitry to system ground during operation of the switching circuit in the amplifier so that the set phase of the cycle can begin with a known level of input (ground) at the input of the processing circuitry, independent of noise and artifacts attributed to the operation of the switching circuit in the integrator.

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Ipswich, MA, United States of America

Roger Finch