Monolithic integrated circuit device with microwave power amplifier including matching circuit using distributed integer line

摘要

The microwave power amplifier is provided with an input / output stage matching circuit and one or more stage-to-end matching circuits. The amplifier, the signal output pad, and the first and second voltage supply pads are formed on one and the same semi-insulating substrate. The drain of the first FET of the output stage is connected to the first voltage supply pad through the first distributed constant line and to the signal output pad through the second distributed constant line, so that the first and second distributed constant lines constitute the matching circuit of the output stage. Contribute.;The drain of the second FET in front of the output stage is connected to the second voltage supply pad via a third distributed constant line that acts as a connecting conductor. The width of the first distributed constant line is wider than the width of the third distributed constant line and has a length that limits the impedance seen from the drain of the output FET to the first voltage supply pad at the operating frequency of the amplifier to a non-infinity value.