| 摘要 |
A cascode-connected amplifier circuit according to the present invention includes two transistors cascode-connected to each other. The cascode-connected amplifier circuit includes a switching element by which it is determined whether or not a collector of an input-side transistor is grounded. Thus, a cascode-connected amplifier circuit can be realized which makes it possible that: an improvement in isolation is made so that operation of the cascode-connected amplifier circuit is surely stopped by simple means.
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