| 摘要 |
In one embodiment, a switching power amplifier is provided that includes: a power switch coupled between a power supply node and ground, wherein the power switch is configured to be cycled on and off responsive to an input signal voltage; and a matching network coupled between a terminal of the power switch and an output node, wherein the matching network includes: a first capacitor coupled between the terminal of the power switch and ground; a second capacitor having a first terminal and an opposing second terminal, the second terminal being coupled to ground, the second capacitor having a greater capacitance than the first capacitor; and a second switch coupled between the first terminal of the second capacitor and the terminal of the power switch, the second switch being configured to be cycled on and off responsive to a switching signal voltage such that the second switch is turned on before the power switch is turned off and such that the second switch is turned off after a current through the power switch is substantially zero responsive to the turning off of the power switch.
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