Tracking oscillator and use of the same in a frequency to...

Details Tracking oscillator and use of the same in a frequency to... Tracking oscillator and use of the same in a frequency to...

H - Electricity

03

L

331/35

H03L 7/06 (2006.01)

Patent

CA 1067589

A TRACKING OSCILLATOR AND USE OF THE SAME IN A FREQUENCY TO VOLTAGE CONVERTER ABSTRACT A tracking oscillator includes an integrator and a hysteresis switch for tracking an input train of waves and providing an output train of square waves. The output is fed back to the integrator to mark transitions between increasing and decreasing direction of integration in response to changes between a high and a low level in the output train of square waves. The tracking oscillator is interposed between a limiter and a phase detector and is used to introduce phase delay to the output of the limiter. The phase detector compares the output of the tracking oscillator and the output of the limiter to provide an output square wave train having a pulse width proportional to the phase delay introduced by the tracking oscillator. A suitable circuitry, such as a low pass filter and averaging circuitry, is coupled to the output of the phase detector for converting the train of square waves into a DC output r wherein the DC voltage is proportional to the phase delay.

274140

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