Gallium arsenide antenna switch having voltage multiplier bias circuit

摘要

A voltage multiplier rectifier filter circuit comprising capacitors C3 and C4 and diodes D1 and D3 multiples, rectifies and filters the voltage at an input terminal (T1) of the switch. A diode (D2) is connected to the output of the multiplier-rectifier-filter circuit to provide a lesser bias voltage in the absence of a signal at the input terminal (T1). Four transistors (Q1-Q4) switch this bias voltage ON and OFF to the gates of four GaAs transistors (S1-S4). The GaAs transistors selectively couple signals between the input and output signal terminals (T1-T4) of the switch.