Patent ID: 6628221
Filing Date: 2003-09-30
Classification: H03F

Abstract:
An analog signal amplifying method of an analog signal amplifier, the method comprising the steps of:outputting a first sawtooth-wave having a frequency much larger than a maximum frequency of input signal of the amplifier, an amplitude identical to or a little larger than a maximum amplitude of the input signal and a predetermined period; comparing the first sawtooth-wave with the input signal to output a first pulse of high level at the region where the amplitude of the first sawtooth-wave is larger than that of the input signal; outputting a second pulse having a small width in the form of one-short type at every starting point of high level regions of the first pulse; outputting a second sawtooth-wave having an amplitude identical to or a little larger than a maximum amplitude of output signal of the amplifier and the same period and phase as that of the first sawtooth-wave; corresponding respective starting points of high level regions of the second pulse to the second sawtooth-wave to continuously generate an output voltage on the basis of a second sawtooth-wave voltage position where the starting points and the high level regions are corresponded with each other; and charging the generated voltage into a condenser by a high speed switch, constantly keeping the voltage charged in it and eliminating a valley to be easily filtered.