Current-to-frequency converter

Details Current-to-frequency converter Current-to-frequency converter

1977-01-19

1978-08-22

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307261, 307229, 328127, 324 99D, H03K 116

Patent

active

041091680

ABSTRACT:
A current-to-frequency converter in which a succession of small charge feedback pulses is selectively generated to null the input current. The feedback pulses are generated by applying voltage pulses of precisely controlled magnitude to a precision capacitor to produce pulses of precisely-determined charge content. These pulses are then applied to a charge-dividing circuit including a matched pair of bipolar transistors. The charge dividing circuit bypasses the bulk of the charge in each pulse, while applying only a minute fraction of each pulse as the feedback current. The charge division ratio is maintained constant by the circuit in spite of temperature fluctuations.

REFERENCES:
patent: 3022469 (1962-02-01), Bahrs
patent: 3350574 (1967-10-01), James
patent: 3376431 (1968-04-01), Merrell
patent: 3594649 (1971-07-01), Rauch
patent: 3660782 (1972-05-01), Friedman et al.
patent: 3742389 (1973-06-01), Hendrickson
patent: 3778794 (1973-12-01), Szabo et al.
patent: 3902139 (1975-08-01), Harrell
patent: 3921012 (1975-11-01), Marshall
patent: 3942110 (1976-03-01), Milkovic

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