Sample and hold frequency to voltage converter circuit

Details Sample and hold frequency to voltage converter circuit Sample and hold frequency to voltage converter circuit

H - Electricity

03

K

328/161

H03K 5/22 (2006.01) G01R 23/06 (2006.01) H03K 19/20 (2006.01)

Patent

CA 1101081

SAMPLE AND HOLD FREQUENCY TO VOLTAGE CONVERTER CIRCUIT ABSTRACT A sample and hold frequency to voltage convertor 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 trans- mission 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.

310719

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