Buffer with active output impedance matching

A method for driving a load using an input voltage, the method comprising:

• coupling the drain voltages of first and second common-source transistors to first and second cascode transistors, respectively;
• coupling the drain voltage of the first cascode transistor to a first resistor;
• coupling the drain voltage of the second cascode transistor to the load, the first resistor having a nominal resistance n times larger than the nominal resistance of the load;
• coupling the drain voltage of the first cascode transistor to the drain voltage of the second cascode transistor using a second resistor, the second resistor having a nominal resistance (n+1) times the nominal resistance of the load and coupling the first resistor in parallel with the load;
• adjusting the gate voltage of the first common-source transistor to minimize a difference between the drain voltage of the first cascode transistor and the input voltage, the gate voltage of the first common-source transistor at least partially dependent on the drain voltage of the first cascode transistor;
• and
• coupling the gate voltage of the first common-source transistor to the gate voltage of the second common-source transistor.