Patent ID: 7714755
Filing Date: 2010-05-11
Classification: H03M

Abstract:
1. A dynamic bias control circuit for a digital-to-analog converter comprising: a current source used for outputting a first current; a first switch having a control end coupled to an output end of the current source for generating the first current; a differential amplifier having a first input end for receiving a reference voltage and a second input end coupled to a first end of the first switch, wherein the reference voltage is determined according to a digital coding; and a third switch coupled between an output end of the differential amplifier and the first switch for adjusting voltages of the first end of the first switch according to a result outputted by the differential amplifier; wherein the control end of the first switch is coupled to a second switch used for inputting a second current into the second switch, and the second current to the first current is a predetermined ratio.