Current to frequency converter switched to increased frequency w

Details Current to frequency converter switched to increased frequency w Current to frequency converter switched to increased frequency w

1983-04-08

1985-10-22

LaRoche, Eugene R.

Oscillators

With device responsive to external physical condition

Temperature or light responsive

331111, 331143, 331153, 331177R, 354410, 354458, G01J 522, H03K 302

Patent

active

045491496

ABSTRACT:
A current to frequency converter comprising a current source, for example a photocell, a voltage to frequency converter, an integrator in the feedback loop of the converter, the current source being connected to the summing junction of the converter and integrator such that the frequency of output pulses from the converter is directly proportional to the magnitude of current injected from the converter to the summing junction, and a controlled circuit for attenuating the current injected from the converter to the summing junction to increase the frequency of output pulses. The controlled attenuating circuit includes a transistor switching arrangement for introducing increased resistance in the path for current injected from the converter to the summing junction in response to the presence of a control signal.

REFERENCES:
patent: 3693112 (1972-09-01), Briggs
patent: 3878484 (1975-04-01), Hekimian
patent: 3902139 (1975-08-01), Harrell
patent: 4057809 (1977-11-01), Nakamoto et al.
patent: 4206648 (1980-06-01), Tuska et al.
patent: 4311375 (1982-01-01), Matsuura
patent: 4408169 (1983-10-01), Fraser

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