Semiconductor switch

A semiconductor switch applicable to an electronic device, comprising a plurality of switching units, each of which comprises:

• a transistor having a drain, a gate and a source;
• a drain bias resistor coupled to the drain;
• a drain bias selecting circuit to couple the drain bias resistor with a first drain bias when the transistor is turned on, and couple the drain bias resistor with a second drain bias when the transistor is turned off;
• a gate bias resistor coupled to the gate;
• a gate bias selecting circuit to couple the gate bias resistor with a first gate bias when the transistor is turned on, and couple the gate bias resistor with a second gate bias when the transistor is turned off;
• a source bias resistor coupled to the source;
• and
• a source bias selecting circuit to couple the source bias resistor with a first source bias when the transistor is turned on, and couple the source bias resistor with a second source bias when the transistor is turned off,
• wherein the first and second drain biases are different, the first and second gate biases are different, the first and second source biases are different, and the plurality of switching units includes a first switching unit and a second switching unit while the source of the first switching unit is serially connected with the drain of the second switching unit and the source bias resistor of the first switching is the drain bias resistor of the second switching unit.