Patent ID: 8681898
Filing Date: 2014-03-25
Classification: H03F,H04L

Abstract:
1. A signal amplifying apparatus comprising: a signal modulating unit configured to quantize an envelope signal into multiple levels to output a multi-level quantized signal; a signal amplifying unit configured to amplify a pulse quantized signal that is obtained by transforming the multi-level quantized signal into a form of a pulse; and a bias generating unit configured to track changes in amplitude of the pulse quantized signal and to provide a bias to the signal amplifying unit based on a result of tracking, wherein the signal modulating unit quantizes the envelope signal into K levels, where K is at least three, and wherein the bias generating unit detects a position of maximum pulse among the pulse quantized signal, generates a pulse signal of the bias generating unit near the position of maximum pulse and provides the generated pulse signal to the signal amplifying unit.