Patent ID: 7746154

Claim:
A voltage multiplexer comprising: a plurality of voltage inputs operative to provide a plurality of voltages having different voltage values; a plurality of control inputs operative to select a selected voltage from the plurality of voltages; a plurality of first transistors, each first transistor of the plurality of first transistors connected to a different one of the plurality of voltage inputs and to a different one of the plurality of control inputs, the plurality of first transistors operative to provide the selected voltage to an output based on values of signals at the plurality of control inputs and independent of the voltage values of the plurality of voltages, wherein a bulk of each first transistor of the plurality of first transistors is connected together to form a bulk network that is connected to a gate of each first transistor of the plurality of first transistors, such that the plurality of first transistors connected to non-selected voltages from the plurality of voltages have gates set at an approximate maximum value among the different voltage values, and wherein the plurality of voltage inputs are not directly connected to a plurality of level shifters that include inputs connected to the plurality of control inputs and outputs connected to the gates of the plurality of first transistors; and a plurality of second transistors coupled to the plurality of first transistors, each second transistor of the plurality of second transistors including a gate and a drain both connected to one of the plurality of voltage inputs and a source connected to the bulk network, wherein each second transistor of the plurality of second transistors has a threshold voltage of zero volts.