| 摘要 |
The present invention relates to a digitizer pen, an input device, and an operating method thereof. According to the present invention, suggested is a power amplifier which includes an amplification circuit part which generates an output signal by amplifying a preset input signal, a bias circuit part which supplies a bias signal to an amplification circuit, and a variable impedance matching unit which performs output impedance matching according to the magnitude of the bias signal. The bias circuit unit controls the magnitude of the bias signal which is supplied to the amplification circuit according to the operation condition of the amplification circuit part. |
