Patent ID: 8531223

Claim:
A signal generator, comprising: an integrated waveform generation unit receiving an inputted digital signal having a digital value according to a set frequency and integrating the digital value to generate an integrated waveform in a sawtooth shape in which a negative value and a positive value are combined; a triangular wave generation unit inverting a digital value outputted from the integrated waveform generation unit to generate a waveform in a triangular wave shape comprised by a digital value; a differential circuit unit differentiating an output of said triangular wave generation unit to generate a waveform in a rectangular wave shape in which the positive value and the negative value are repeated; a digital/analog conversion unit digital/analog converting an output of said differential circuit unit; an integration circuit unit integrating an analog output of said digital/analog conversion unit and outputting an integrated waveform in a triangular wave shape; and a comparator comparing an output of said integration circuit unit and a preset threshold value and outputting a rectangular wave of an objective frequency being a comparison output.