Patent ID: 8344927
Filing Date: 2013-01-01
Classification: H03M

Abstract:
1. An analog digital converting device comprising: a first reference voltage generating circuit generating a first reference voltage; a second reference voltage generating circuit generating a second reference voltage; a first sub analog digital converter receiving an analog input signal and converting the analog input signal into a first digital signal by using the first reference voltage; an amplifier converting the first digital signal into a voltage corresponding to the first digital signal by using the first reference voltage and amplifying a difference between a voltage level of the analog input signal and a level of the voltage corresponding to the first digital signal to output a residual signal; and a second sub analog digital converter receiving the residual signal and converting the residual signal into a second digital signal by using the second reference voltage, wherein a level of the second reference voltage is increased or decreased according to a level of the second digital signal, the level of the second digital signal corresponding to an amplification gain of the amplifier with respect to a predetermined value.