DIGITAL TO DIFFERENTIAL CONVERTERS AND DIGITAL TO ANALOG CONVERTERS USING THE SAME

摘要

A converter for converting digital data into differential analog signals includes a temperature and process independent bias voltage generator (101) for generating a bias voltage and a digital-to-differential converter (103) for converting a digital word into differential voltages. The digital-to-differential converter (103) includes a first switching circuitry controlled by the digital word for selectively coupling a first output node to the bias voltage and a second output node to a supply voltage. Second switching circuitry controlled by a complement of the digital word selectively couples the first output node to the supply voltage and the second output node to the bias voltage. The first and second pairs of switches substantially simultaneously conduct at a desired differential cross-over voltage at the first and second output nodes based on the choice of the bias voltage such that the differential analog converter (103) operates from the operating voltage to the operating voltage plus the bias voltage range.