| 摘要 |
This power modulator (100) is provided with a pulse current modulator (1), a linear amplifier (2), and a power amplifier (3). The pulse current modulator (1) is provided with a DC current source (11), a diode (Ds), and a switching element (SW). The power amplifier (3) amplifies a wireless signal (WS). The linear amplifier (2) is applied with a negative feedback and is inputted with an envelope signal (ES). The pulse current modulator (1) is coupled to the power source terminal of the power amplifier (3) via an inductor (L), is connected to the output terminal of the linear amplifier (2), and outputs a pulse current in accordance with the control signal generated from the envelope signal (ES). The anode of the diode (Ds) is connected to the output terminal of the DC current source (11) and the cathode of the diode (Ds) is connected to the output terminal of the pulse current modulator (1). The switching element (SW) is inserted between the ground potential and the output terminal of the DC current source (11), and is controlled by means of the control signal. |
