DIGITAL-TO-ANALOG CONVERTER CIRCUIT

摘要

A digital to analog converter including a current source for providing a master current, a first sub digital to analog converter coupled to the current source which generates a plurality of currents, and a second sub digital to analog converter coupled to at least one of the plurality of currents from the first sub digital to analog converter which generates a second plurality of currents. The digital to analog converter also includes an overlap adjustment circuit coupled with the second sub digital to analog converter which adds current. The digital to analog converter is configured to operate in a first mode for generating a sine wave with a first bit level accuracy and, when in the first mode, the overlap adjustment circuit adds no current. to the second sub digital to analog converter The digital to analog converter is configured to operate in a second mode for generating a ramp wave with a second bit level accuracy and, when in the second mode, the overlap adjustment circuit adds current to the second sub digital to analog converter. When in the second mode, the total current of the second sub digital to analog converter and the overlap converter is greater than one of the plurality of currents generated by the first sub digital to analog converter.

主权项

1. A digital to analog converter, comprising:
a current source for providing a master current; a first sub digital to analog converter coupled to the current source, wherein the first sub digital to analog converter generates a plurality of currents; a second sub digital to analog converter coupled to at least one of the plurality of currents from the first sub digital to analog converter, wherein the second sub digital to analog converter generates a second plurality of currents; an overlap adjustment circuit coupled with the second sub digital to analog converter, wherein the overlap adjustment circuit adds current, wherein
the digital to analog converter is configured to operate in a mode for generating a ramp wave wherein the ramp wave has a first bit level accuracy and wherein the overlap adjustment circuit adds current to the second sub digital to analog converter, andthe total current of the second sub digital to analog converter and the overlap converter is greater than one of the plurality of currents generated by the first sub digital to analog converter.