Patent ID: 8674769
Filing Date: 2014-03-18
Classification: H02H,H03F

Abstract:
1. A power amplifier protection circuit, comprising: an input detection circuit, a delay circuit, and a control circuit; wherein an input end of the input detection circuit is connected to a signal input end, and the input detection circuit is configured to detect an abnormal signal in an input signal, compare the abnormal signal with a reference level, and output a protection control signal if a pulse amplitude of the abnormal signal is higher than the reference level; an input end of the delay circuit is connected to an output end of the input detection circuit, and the delay circuit is configured to perform delay processing on the protection control signal and control a pulse width of the protection control signal; and an input end of the control circuit is connected to an output end of the delay circuit, and an output end of the control circuit is connected to an input end of a power amplifier, and the control circuit is configured to control the power amplifier to be in an off state in a pulse width of a protection control signal that has undergone the delay processing and is output by the delay circuit, so that the abnormal signal passes through the power amplifier when the power amplifier is in the off state.