Patent ID: 9673759
Date: 2017-06-06
CPC Classifications: H01L,H03F

Claim:
1. A distributed amplifier, comprising: a distributed amplifier monolithic microwave integrated circuit (MMIC) chip, said chip comprising an RF input configured to receive an RF signal that propagates down an input transmission line, a plurality of parallel-connected FET amplifier stages and an output transmission line that connects the drain terminals of the FET amplifier stages, said FET amplifier stages producing an amplified RF signal over a bandwidth at an RF output of the last FET amplifier stage; an off-chip bias circuit comprising a common input for receiving a DC bias current from a DC supply and a plurality of parallel-connected bias chokes among which the DC bias current is divided, each bias choke comprising a series inductor L connected to a grounded capacitor C, said series inductor L having sufficient impedance to block RF energy from reaching the common input over the entire bandwidth; and a plurality of connections that electrically and physical connected the plurality of series inductors L in parallel to a like plurality of the drain terminals at different FET amplifier stages to supply DC bias current at different locations along the output transmission line.