To make it possible to be operated with a small signal amplitude and reduce power consumption in a two-modulus prescaler circuit available for a frequency synthesizer or the like.
The prescaler circuit is provided with n pieces of (n≥3) DFF and first and second multi-input logic gates having at least two inputs and configured to connect the output terminal of the first multi-input logic gate to the data input terminal of the first DFF, to respectively connect the output terminals of first to (n-2)th DFF to the data input terminals of the second to (n-1)th DFF, to connect the output terminal of the (n-1)th DFF and the output terminal of the n-th DFF to the input terminal of the first multi-input logic gate, to connect the output terminal of the (n-1)th DFF to the second multi-input logic gate, to input a switching signal thereto and to connect the output terminal of the second multi-input logic gate to the data input terminal of the n-th DFF, and all the connections are connection to use differential signals.
TSUKAHARA TSUNEO
SHINPO YUKIO
NTT ELECTRONICS CORP
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