Patent ID: 7336935

Claim:
A dynamic power control circuit for a wireless communication device, comprising: a signal emission circuit comprising a radio frequency auto-gain control circuit, the auto-gain control circuit comprising a dynamic gain power amplifier, a power detector, a comparator, and a low pass filter, wherein the detector detects the output power of the amplifier and outputs a output voltage to the comparator, the comparator compares the output voltage with a reference voltage from an adder, and the filter filters out noise of control voltage output from the comparator, thereby making the control voltage to be a control value of gain amplification of the amplifier; another power detector, another comparator, another low pass filter and the adder, being disposed between the comparator and an antenna of the wireless communication device, wherein a specified reference voltage is configured in the adder, whereby the another power detector detects signal voltage received by the antenna and outputs a received voltage to the another comparator, the another comparator compares the received voltage with a specified received voltage limit and outputs a reference voltage to the another low pass filter, the another low pass filter filters out noise of the reference voltage and then outputs the reference voltage to the adder, the adder adds the reference voltage and the specified reference voltage and outputs another reference voltage to the comparator.