Patent ID: 6567441
Filing Date: 2003-05-20
Classification: H01S

Abstract:
A source follower circuit for transmitting a signal received at an input terminal to an output terminal, comprising:a source follower stage and a bias stage, wherein the source follower stage comprises: a first III-V compound semiconductor transistor having a source coupled to the output terminal, a drain coupled to a first power line and a gate coupled to the input terminal, a second III-V compound semiconductor transistor having a source coupled to a second power line, a drain and a gate, and a third III-V compound semiconductor transistor having a source coupled to the drain of the second III-V compound semiconductor transistor, a drain coupled to the output terminal, and a gate; and wherein the bias stage has a first node coupled to the gate of the third III-V semiconductor transistor for providing a first bias voltage, a second node coupled to the gate of the second III-V semiconductor transistor for providing a second bias voltage, and a first circuit portion provided to generate the second bias voltage smaller than the first bias voltage.