Patent ID: 7924198
Filing Date: 2011-04-12
Classification: H03M

Abstract:
1. A digital-to-analog converter comprising: a decoder that receives a plurality of digital input signals to output a plurality of thermometer decode signals; a current supply part including a plurality of current sources, each of which operates in one of a sleeping mode and an operating mode under the control of the thermometer decode signals, the current supply part selectively outputting a plurality of switching power signals; and a switching part including a plurality of switching units, each of which operates in one of a sleeping mode and an operating mode under the control of the thermometer decode signals, the switching part outputting an analog signal under the control of the thermometer decode signals, wherein an i-th current source of the plurality of current sources operates in the operating mode when an output of an (i−1)-th current source and an i-th thermometer decode signal are activated, and the i-th current source is converted into the sleeping mode when at least one of the output of the (i−1)-th current source and the i-th thermometer decode signal are inactivated, where “i” is a positive integer, wherein when the i-th current source is converted into the sleeping mode, an (i+1)-th current source cascade-connected to an output terminal of the i-th current source to a last current source and an i-th switching unit to a last switching unit of the plurality of switching units are converted into the sleeping mode.