SWITCH WITH CONSTANT VGS CIRCUIT FOR MINIMIZING RFLATNESS AND IMPROVING AUDIO PERFORMANCE

摘要

A MOSFET switch (10) is disclosed that is driven on by a circuit that provides a constant gate to source voltage, Vgs, that is independent of the input voltage (A in) he power supply and any logic signals. The constant Vgs is derived from a reference voltage (V bias) and biases the MOSFET switch such that Ron is constant, or Rflatness is minimized. A minimized Rflatness provides a higher fidelity transfer of audio signals compared to prior art switches where Rflatness is greater.