Multi-voltage multiplexer system

A voltage multiplexer comprising:

• a plurality of voltage inputs, each voltage input providing a different input voltage;
• a plurality of control inputs operative to select one of the input voltages for output;
• a plurality of level shifters, each level shifter coupled to a different one of the control inputs;
• a plurality of first transistors, each first transistor connected to a different one of the voltage inputs at its source and to a different one of the level shifters at its gate, the plurality of first transistors connected to an output at their drains such that the selected input voltage is provided at the output, wherein a bulk of each of the first transistors is connected together to form a bulk network, and wherein the bulk network is connected to an input of each of the level shifters such that each first transistor connected to a non-selected voltage input has its gate set at approximately the maximum of the input voltages;
• and
• a plurality of second transistors, each second transistor connected between one of the voltage inputs and the bulk network, and functioning as a diode.

A method for multiplexing voltage inputs having different voltage levels, the method comprising:

• providing a plurality of voltage inputs, each voltage input providing a different input voltage;
• receiving, on a plurality of control inputs, signals to select one of the input voltages for output;
• providing a plurality of transistors, each transistor connected to a different one of the voltage inputs and to a different one of the control inputs, the plurality of transistors connected to an output;
• providing the selected input voltage at the output without a voltage drop;
• and
• providing approximately the maximum of the input voltages to the gate of each of the plurality of non-selected transistors connected to non-selected voltage inputs such that the non-selected transistors are reliably turned off.