Patent ID: 8509714
Filing Date: 2013-08-13
Classification: H03C,H03F,H03G,H04L

Abstract:
1. A signal transmitting apparatus comprising: a polar coordinate converter that separates and outputs an envelope curve signal which is size information and a phase signal which is phase information from a signal to be transmitted; an up-converter in communication with the polar coordinate converter that up-converts and outputs the phase signal received form the polar coordinate converter; a power amplifier in communication with the up-converter that amplifies and outputs the phase signal output from the up-converter; and a bias modulation unit in communication with the polar coordinate converter and the power amplifier, the bias modulation unit comprising: wherein the power amplifier amplifies the phase signal output using the envelope curve signal output from the bias modulation unit as a bias voltage, wherein if the analog form of the envelope curve signal is larger than the predetermined voltage, the bias modulation unit amplifies the envelope curve signal according to a first driving voltage, and if the analog form of the envelope curve signal is smaller than the predetermined voltage, the bias modulation unit amplifies the envelope curve signal according to a second driving voltage, the first driving voltage larger than the second driving voltage.