US Patent 11283457 Waveform generator and waveform generating method

A waveform generator is provided. The waveform generator includes a timer and a digital to analog converter (DAC). The timer periodically provides a trigger signal according to a fixed time period. In response to the trigger signal, the DAC is configured to convert first digital data into output voltage of an analog signal. A data hold register is configured to store second digital data that corresponds to the previous output voltage of the analog signal. A judgment circuit is configured to provide a first control signal according to the second digital data, and the first control signal indicates that the previous output voltage is within a first voltage range. A calculation circuit is configured to obtain the first digital data according to the second control signal, the second digital data, and a voltage variation that corresponds to the first voltage range and to update the second digital data.