Digital to analog converter with precise linear output for both positive and negative digital input values

摘要

A circuit and method for converting a digital number to an analog output signal, wherein the most significant bit or "sign" bit of the digital number is used for switching the accumulated currents of the other data bits to a chain of operational amplifiers employing feedback resistors for conversion into an output voltage of magnitude and sign corresponding to the input digital number. A decoding circuit and method enables the circuit to present an output voltage corresponding to the two's-complement of the input digital number.