Patent ID: 11949411
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 4:
5. A semiconductor device comprising:
an n-channel depletion-mode transistor including a gate terminal and a source terminal;
an input matching circuit to which high-frequency power is input, which is connected to the gate terminal and a ground terminal, and inside which the gate terminal and the ground terminal are DC-connected;
a self-bias circuit including a resistor having one end connected to the source terminal and the other end connected to the ground terminal and biasing the transistor by a voltage drop due to a current flowing through the resistor, and a capacitor connected in parallel with the resistor, the capacitor functioning as short-circuit at a frequency of the high-frequency power; and
a protective circuit including a plurality of sets, each set including a diode in one stage or connected in a plurality of stages in the same direction and a switch connected in series with the diode, the diode having an anode side end connected to the source terminal and a cathode side end connected to the ground terminal.