Patent ID: 7834791

Claim:
A digital-to-analog converter for converting a digital input into an analog output, coupled to a first voltage source and comprising: a load circuit for rendering the analog output; a switch circuit coupled to the load circuit and including at least one transistor for selectively conducting a current flow to the load circuit; and a voltage booster coupled to the at least one transistor, and providing a first gate-source voltage and a second gate-source voltage to generate a voltage of a first level according to the first voltage source and the first gate-source voltage, and to generate a voltage of a second level according to the voltage of the first level and the second gate-source voltage, thereby controlling the at least one transistor to be switched on so as to conduct the current flow to the load circuit in response to the voltage of the first level or the second level; wherein the first level and the second level vary with the first voltage source.