Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1977-11-25
1979-08-28
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
328151, 307353, 307264, 307273, 307246, 324169, H03K 114
Patent
active
041662482
ABSTRACT:
A sample and hold frequency to voltage converter circuit particularly suitable for use in automotive applications as a tachometer or other speed indicating device. The converter uses circuit means, responsive to a periodically varying input signal, to generate first and second pulse trains. The pulses in the pulse trains have a repetition frequency and duty cycle that varies as a function of the frequency of the input signal. An integrator is provided for generating a voltage proportional to the duty cycle of the second pulse train. A transmission gate is controlled by the first pulse train and couples the integrator to a capacitor. The capacitor is charged or discharged, almost instantaneously, each time the transmission gate is rendered conductive by a pulse from the first pulse train. The capacitor then develops a voltage which is proportional to the frequency of the input signal.
REFERENCES:
patent: 3333109 (1967-07-01), Updike
patent: 3535658 (1970-10-01), Webb
patent: 3782784 (1974-01-01), Marouby
patent: 3801918 (1974-04-01), Milne et al.
patent: 3867647 (1975-02-01), Callahan et al.
patent: 3971995 (1976-07-01), Eikelberger
Bianchi Frank J.
Poulson Russell H.
Brown Robert W.
Ford Motor Company
Heyman John S.
Sadler Clifford L.
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