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1. (WO2018123199) FREQUENCY SWEEP OSCILLATION CIRCUIT

Pub. No.:    WO/2018/123199    International Application No.:    PCT/JP2017/036593
Publication Date: Fri Jul 06 01:59:59 CEST 2018 International Filing Date: Wed Oct 11 01:59:59 CEST 2017
IPC: H03L 7/12
G01S 7/28
H03L 7/197
Applicants: SOCIONEXT INC.
株式会社ソシオネクスト
Inventors: IRIE Masatake
入江 正丈
Title: FREQUENCY SWEEP OSCILLATION CIRCUIT
Abstract:
A frequency divider control circuit (15) outputs, to a frequency divider (14), a frequency divider control signal for increasing a frequency division ratio N from a first frequency division ratio to a second frequency division ratio larger than the first frequency division ratio during an up-chirp period, reducing the frequency division ratio N from the second frequency division ratio to a third frequency division ratio larger than the first frequency division ratio but smaller than the second frequency division ratio during a blank period, and returning the frequency division ratio N to a first frequency division ratio. Control is executed so as to set the absolute value of the time change rate of the frequency division ratio N in the reduction from the third frequency division ratio to the first frequency division ratio during the blank period to be lower than that of the time change rate of the frequency division ratio N in the reduction from the second frequency division ratio to the third frequency division ratio during the blank period.