Importance

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Abstract

A frequency synthesizer for use in a high-frequency multichannel radio apparatus and so on. More particularly, a phase-locked loop (PLL) type frequency synthesizer which can perform a pulling process at high speed. Namely, a frequency synthesizer of the present invention can effect a pulling process at high speed by putting input signals to a phase comparator into a state in which the input signals are in phase with each other in an intermittent operation mode and can have strong resistance to noises by providing a 1-bit data latch and gate circuits in a data inputting portion thereof and synthesizing strobe signals at the time of inputting data thereto.

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First Claim