Distributed amplifier

A distributed amplifier comprising:

• an input-side transmission line;
• M (M:
• integer not less than 2) amplification circuits;
• M output-side transmission lines provided in accordance with the M amplification circuits;
• and
• a combination circuit configured to combine outputs of the M output-side transmission lines;
• wherein
• the input-side transmission line includes an input-side serial line formed by connecting in series M×N (N:
• integer not less than 2) unit transmission lines each including the same line length, and an input-side terminating resistor,
• the M amplification circuits each includes N amplifiers and the N amplifiers of the i-th (i:
• integer not less than 1 and not more than M) amplification circuit take the input node of the ((k−1)M+i)-th (k:
• integer not less than 1 and not more than N) input-side transmission line to be the input, and
• the output-side transmission line includes an output-side serial line including N transmission lines each being connected in series between the neighboring outputs of the N amplifiers and each including a line width with which the phase of the output of the amplifier in each stage agrees to one another.