| 摘要 |
A distributed amplifier having a plurality of cascode amplifying circuits, and which causes little deterioration of the output waveform. In a preferred embodiment, the source potentials of the source-grounded transistors of the respective amplifying circuits are set individually. The source potentials of none or one or more of the source-grounded transistors are set at +0.8 volts, and the source potentials of the remaining source-grounded transistors are set at zero volts. The voltage gain of the source-grounded transistors whose source potential is +0.8 volts is zero, so that these source-grounded transistors do not contribute to the voltage gain of the amplifier as a whole. The source-grounded transistors whose source potential is zero volts contribute to the voltage gain, and output an amplified signal with a good waveform. The magnitude of the voltage gain can be adjusted by setting the number of source-grounded transistors whose source potential is zero volts.
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