Digital-to-analog converter with constant bias voltage

A MOS digital-to-analog converter, comprising:

• a source voltage supply;
• a gate voltage supply;
• at least two transistors in series with the source voltage supply and the gate voltage supply;
• a source bus having a taper from a first end to a second end, the source bus connected at the first end to the source voltage supply and connected to a source of each transistor;
• and
• a gate bus connected to the gate voltage supply, wherein the gate to source voltage for each transistor is constant and the transistor series does not use precision resistors or capacitors.

A MOS digital-to-analog converter, comprising:

• a source voltage supply;
• a gate voltage supply;
• at least two transistors in series with the source voltage supply and the gate voltage supply;
• a gate bus having a taper from a second end to a first end, the gate bus connected at the first end to the gate voltage supply and connected to a gate of each transistor;
• and
• a source bus connected to the source voltage supply, wherein the gate to source voltage for each transistor is constant.

A method of converting a digital signal to an analog signal, comprising:

• providing a digital signal;
• setting a series of switches, a position of each switch depending on the digital signal;
• providing a series of MOS transistors corresponding to the series of switches, each transistor having a constant gate-to-source voltage;
• generating a voltage in a load resistor due to the current flowing from the transistors through the switches;
• and
• providing an analog signal.