Electrical computers: arithmetic processing and calculating – Electrical analog calculating computer – Particular function performed
Reexamination Certificate
2005-11-01
2005-11-01
Mai, Tan V. (Department: 2193)
Electrical computers: arithmetic processing and calculating
Electrical analog calculating computer
Particular function performed
Reexamination Certificate
active
06961746
ABSTRACT:
A current integration circuit includes an operational amplifier having a capacitor connected between its output and inverting input which integrates an input current. To prevent the op amp's output from becoming saturated, a charge dumping circuit dumps a known charge of the opposite polarity to that stored on the capacitor to the op amp's inverting input, thus reducing the charge on the capacitor and preventing the op amp's output from becoming saturated. A charge dump is triggered whenever the op amp's output exceeds a predetermined trip voltage. Counting the number of charge dumps performed during a given integration period provides a coarse indication of the magnitude of the integrated input current, and the output of the op amp provides a fine indication.
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Analog Devices Inc.
Koppel, Jacobs Patrick & Heybl
Mai Tan V.
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