| 摘要 |
A power amplifier including a loop filter, a frequency generator, a quantizer, and an output stage module is provided. The frequency generator outputs a signal with a reference frequency to the loop filter, and includes a logic circuit, a current array, and a dummy load. The dummy load representing a load circuit in the loop filter is coupled to the current array. An equivalent impedance of the dummy load is proportioned to an equivalent impedance of the load circuit. The current array outputs the signal and a dummy signal to the loop filter and the dummy load, respectively, according to a logic signal. By using the frequency generator to modulate the frequency automatically, an impact on the power amplifier caused by passive devices therein due to process variationscan be reduced.
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