Low frequency signal period or ratio (period)-to-voltage convert

Details Low frequency signal period or ratio (period)-to-voltage convert Low frequency signal period or ratio (period)-to-voltage convert

1978-10-13

1980-07-29

Heyman, John S.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

328151, 324 78E, 328133, H03K 906, H03K 1302, H03K 1332

Patent

active

042153158

ABSTRACT:
A converter that provides an analog (voltage) output signal that denotes either the period of an unknown low frequency signal or the ratio between the periods of two unknown low frequency signals is disclosed. The converter includes a ramp generator having a capacitor that is alternately charged in accordance with the periods of two low frequency signals. Between charging cycles the capacitor is discharged. When the period of an unknown low frequency signal is to be converted to analog form, one of the charge controlling signals is the unknown signal and the other signal is a known low frequency signal. When the ratio of the periods of two unknown low frequency signals is to be converted to analog form, the two unknown signals control the charging of the capacitor of the ramp generator. The ramp generator charge controlled by the period of the known signal (in the period conversion case) or one of the unknown signals (in the ratio conversion case) is used to control the level of a signal stored by a feedback sample and hold circuit, which circuit controls the output of the current source that charges the capacitor of the ramp generator. The ramp generator charge controlled by the other signal (the unknown in the period conversion case or the other unknown in the ratio conversion case) controls the level of an analog signal stored by an output sample and hold circuit, which signal represents: (a) the period of the unknown signal in the period conversion case; and, (b) the ratio between the periods of the unknown signals in the ratio conversion case.

REFERENCES:
patent: 3541320 (1970-11-01), Beall
patent: 3839673 (1974-10-01), Acker
patent: 4068181 (1978-01-01), Clark et al.
patent: 4134029 (1979-01-01), Bright et al.

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