| 摘要 |
According to one embodiment, an FMCW signal generation circuit includes a voltage-controlled oscillator, a digital phase detector, a differentiator, a comparator, a low-pass filter, an amplifier, a D/A converter, and an integrator. The voltage-controlled oscillator generates an FMCW signal including an oscillation frequency corresponding to a control signal. The digital phase detector detects phase information of the FMCW signal to generate a detection signal. The differentiator differentiates the detection signal once to generate a differential signal. The comparator compares the differential signal with a target frequency to generate an error signal. The low-pass filter suppresses a high-frequency component of the error signal to generate a filtered signal. The amplifier amplifies the filtered signal to generate an amplified signal. The D/A converter converts the amplified signal to analog to generate an analog signal. The integrator integrates the analog signal to generate the control signal.
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