Patent ID: 6317069
Filing Date: 2001-11-13
Classification: H03M

Abstract:
A digital-to-analog converter for converting a digital input signal into an analog output signal, said digital input signal consisting of a plurality of binary bits including a lowest binary bit and a highest binary bit, said converter including a binary-weighted transistor array for converting at least two of the binary bits of the digital input signal, said binary-weighted array comprising:for each of the at least two binary bits, a metal oxide semiconductor device pair consisting of an upper metal oxide semiconductor device and a lower metal oxide semiconductor device series-connected at a common node and between a upper-limit voltage reference and a lower-limit voltage reference, said upper metal oxide semiconductor device activated by a switch control signal generated in response to the binary bit, said lower metal oxide semiconductor device activated by an inverse of the switch control signal, said upper and lower metal oxide semiconductor switches each having an effective resistance inversely proportional to a W/L line ratio; andfor adjacent ones of the at least two binary bits, an interconnecting metal oxide semiconductor device connected between the common nodes of the metal oxide semiconductor device pairs of the adjacent binary bits, said interconnecting metal oxide semiconductor device permanently activated by a fixed voltage control signal and having an effective resistance inversely proportional to a 2W/L line ratio.