SIGNAL GENERATOR, RADAR DEVICE

摘要

A signal generating circuit (or a generator) of an embodiment includes an oscillator to produce an oscillation signal controlled in oscillating frequency by an analog control signal. The circuit includes: a digital phase detector detecting phase information of the oscillation signal and outputting digital phase information; a first differentiator differentiating the digital phase information and outputting digital frequency information; a comparator comparing a frequency setting code setting the oscillating frequency with the digital frequency information and outputting digital frequency error information; and a low-pass filter removing a high-frequency component of the digital frequency error information. The circuit further includes: a D/A converter converting the digital frequency error information of which high-frequency component is removed into analog frequency error information; and an integrator integrating the analog frequency error information, to convert into analog phase error information, and outputting the analog phase error information as the analog control signal.