Modulation signal generation circuit, transmission/reception module, and radar device

摘要

A VCO (1) includes two variable impedance circuits that independently control oscillation frequency of the VCO (1) based on an input control voltage. A frequency-correction-voltage generating unit (3) outputs a voltage for compensating for a temperature drift of the oscillation frequency according to an ambient temperature of a circuit, for a first variable impedance circuit. An FM-modulation-voltage generating unit (2) outputs a modulation voltage containing a temperature-independent constant DC component and a predetermined AC component, for a second variable impedance circuit, under a temperature drift compensation condition set by the frequency-correction-voltage generating unit (3).