Patent ID: 6864750

Claim:
A single-phase cascode distributed amplifier including a plurality of unit circuits connected in parallel, each unit circuit comprising: a pair of first and second field-effect transistors connected in series between an input transmission wire and an output transmission wire, the first field-effect transistor having a gate connected to the input transmission wire, a source grounded and a drain connected to the second field-effect transistor, and the second field-effect transistor having a gate grounded, a source connected to the drain of the first field-effect transistor and a drain connected to the output transmission wire; a damping resistor having a first end connected to the gate of the second field-effect transistor and a second end, the damping resistor prevents a rapid increase of a negative-polarity resistance of the second field-effect transistor in a high frequency range where oscillation of the amplifier tends to occur; and a capacitor having a first end connected to the second end of the damping resistor and a second end grounded.