Switch, radio frequency chip, and board

摘要

The present invention provides a switch, a radio frequency chip, and a board. A bias voltage is set by using a bias voltage setting circuit (11), which increases a direct-current level of an input signal (Pi), avoids as far as possible that a switch unit (12) which should be turned off is turned on in a case where a large signal is input into a switch circuit, optimizes the performance of the switch unit (12) in an off state in a switch such as a CMOS SPNT switch in a case where a large signal is input, and effectively improves the linearity and isolation of the switch such as the CMOS SPNT switch.