Patent ID: 6842134

Claim:
A D/A converter comprising: a DC processing circuit for providing fixed voltage levels including a zero voltage level and two voltage levels having opposite polarity relative to the zero voltage level forming a positive voltage, and a negative voltage; a switching device in electrical communication with the DC processing circuit for receiving the three fixed voltage levels, the switching device for receiving a digital signal and for selectively providing at an intermediate port at each of a plurality of successive times one of the voltage levels in dependence upon the digital signal in order to produce a first output signal at the intermediate port, the output signal being a series in time of positive, zero, and negative voltage levels; a bootstrap circuit for receiving the first output signal and for providing a second output signal having approximately same content as the first output signal but driven from a different signal driver than the first output signal; and, a low-pass filter circuit in electrical communication with the bootstrap circuit, the low-pass filter for receiving the second output signal and for averaging the first output signal in time.