VCO_AND_INPUT_FREQUENCY_COMPARER

Published:2009/6/19 4:17:00 Author:May | From:SeekIC

Comparison of an input signal's frequency (fi) with that of voltage-controlled oscillator (fVCO) can be accomplished with just one CMOS phase-locked loop IC and a transistor (see figure). The phase and the frequency can be compared with a phase comparator, which, along with the VCO, is part of the HEF4046 PLL IC. The transistor helps introduce hysteresis, enabling the circuit to be used as a switch driver.



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