AMPLIFIER CIRCUIT

摘要

Provided is an amplifier circuit including an NMOS transistor having a low drain breakdown voltage and an NMOS transistor having a high drain breakdown voltage connected in series thereto, and capable of preventing breakdown of a drain of the NMOS transistor having a low drain breakdown voltage. A clamp circuit configured to limit a drain voltage of the NMOS transistor having a low drain breakdown voltage is connected to the drain thereof.

主权项

1. An amplifier circuit configured to amplify a signal input to an input terminal and to output the amplified signal to an output terminal,
the amplifier circuit comprising: a first transistor including a gate connected to the input terminal; a second transistor including a drain connected to the output terminal and a source connected to a drain of the first transistor, the second transistor having a drain breakdown voltage higher than a drain breakdown voltage of the first transistor and being always in an operating state; and a clamp circuit connected to the drain of the first transistor, and configured to limit a drain voltage of the first transistor.