Patent ID: 8125271
Filing Date: 2012-02-28
Classification: H01H,H03F

Abstract:
1. A power amplifier comprising: a comparator for receiving a first analog signal, comparing the first analog signal with a reference signal and outputting a square wave signal; a bridge circuit for amplifying the square wave signal, outputting an amplified square wave signal, and comprising a first MEMS switch and a second MEMS switch, the first MEMS switch and the second MEMS switch turning on alternately when the polarity of the square wave changes, and outputting a first voltage signal or a second voltage signal respectively; and a low-pass filter for converting the amplified square wave signal into a second analog signal, wherein the first MEMS switch comprises: a first electrode including a first conductor and a second conductor connected to the input end of the low-pass filter; a second electrode including a first connecting conductor; the first electrode and the second electrode being configured to shift away from or close to each other under the control of the square wave signal, and connecting the first conductor and the second conductor through the first connecting conductor, thereby transmitting the first voltage signal put on the first conductor to the second conductor; and the second MEMS switch comprises: a third electrode, including a third conductor and a fourth conductor connected to the input end of the low-pass filter; a fourth electrode, including a second connecting conductor; the third electrode and the fourth electrode being configured to shift away from or close to each other under the control of the square wave signal, and connecting the third conductor and the fourth conductor through the second connecting conductor, thereby transmitting the second voltage signal put on the third conductor to the fourth conductor.