Patent ID: 7312740
Filing Date: 2007-12-25
Classification: H03M

Abstract:
1. A current steering digital-to-analog converter (DAC), used for converting a digital signal having a first bit number, the current steering DAC comprising: a first DAC, used for converting a digital signal having a second bit number and outputting a first output current; a second DAC, used for converting a digital signal having a third bit number and outputting a second output current, wherein the sum of the second bit number and the third bit number is equal to the first bit number; a first current mirror, used for mapping and outputting the first output current of the first DAC as a first mapped output current, wherein the first mapped output current is a magnified output current by multiplying the first output current of the first DAC by 2 a second current mirror, used for mapping and outputting the second output current of the second DAC as a second mapped output current, wherein the output of the current steering DAC is the total current of the first mapped output current and the second mapped output current.