A High Precision Reference Resistor Ladder for High-speed A/D Converters
Yin Shi · Dianzi xuebao · 2000
It is significant to increase the precision of reference voltages produced by the reference resistor ladder at the front end of high speed A/D converters.To suppress nonlinear errors caused by the loading effect on the resistor ladder,a kind of parallel resistor ladder with fewer resistors on each branch is proposed.The error distribution of reference voltages along the parallel resistor ladder is also given.Without any compensation circuit,obvious precision improvement of reference voltages is achieved in addition to another advantages of faster settling speed、strengthened driving capability and lower temperature sensitivity.Both detailed analysis and simulation results show that it is very suitable for the use in high speed A/D converters such as flash、multi step and folding architectures,etc.