R/2R' ladder switch circuit and method for digital-to-analog con

Details R/2R' ladder switch circuit and method for digital-to-analog con R/2R' ladder switch circuit and method for digital-to-analog con

1999-06-22

2000-11-21

Young, Brian

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341144, H03M 178

Patent

active

06150971&

ABSTRACT:
A digital-to-analog converter includes a resistive divider network including a plurality of series resistors of resistance R and a plurality of shunt resistors of resistance 2R' and a circuit for switching a shunt resistor of the resistive divider network in the digital-to-analog converter to either of first and second reference voltages. The switching circuit includes a first switch MOSFET coupling the low reference voltage to the shunt resistor, and a second switch MOSFET coupling the shunt resistor to the high reference voltage. First and second switch control circuits adjust the on resistances of the first and second switch MOSFETs to be proportional to the resistances of first and second reference resistors, which have the same temperature coefficient as the resistors of which the divider network is composed. The on resistance of each of the first and second switch MOSFETs is equal to R.sub.ONi, and the resistance 2R' is equal to 2R-R.sub.ONi. The on resistances do not need to be binarily scaled.

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