Semiconductor integrated circuit and condenser microphone
View Patent ↗A semiconductor integrated circuit for a condenser microphone according to one exemplary aspect of the present invention includes a first resistor, a second resistor, a power supply terminal, a first capacitor, and a first diode. The first resistor and the second resistor are connected between a drain of an output transistor and an output terminal in series. The power supply terminal is connected to a source of the output transistor. The first capacitor is arranged between the power supply terminal and a connection point of the first resistor and the second resistor. The first diode is connected in parallel with the first capacitor.
1. A semiconductor integrated circuit for a condenser microphone, the semiconductor integrated circuit comprising:
a first resistor and a second resistor connected between a drain of an output transistor and an output terminal in series;
a power supply terminal connected to a source of the output transistor;
a first capacitor arranged between the power supply terminal and a connection point of the first resistor and the second resistor; and
a first diode connected in parallel with the first capacitor.
2. The semiconductor integrated circuit according to claim 1 , further comprising:
a third resistor connected between the second resistor and the output terminal in series;
a second capacitor arranged between the power supply terminal and a connection point of the second resistor and the third resistor; and
a second diode connected in parallel with the second capacitor.
3. The semiconductor integrated circuit according to claim 1 , wherein
the first resistor is formed of a spiral inductor.
4. The semiconductor integrated circuit according to claim 2 , wherein
the first resistor is formed of a spiral inductor.
5. A condenser microphone, comprising:
a semiconductor integrated circuit according to claim 1 ; and
a diaphragm connected to a gate of the output transistor.
6. A condenser microphone, comprising:
a semiconductor integrated circuit according to claim 2 ; and
a diaphragm connected to a gate of the output transistor.
7. A condenser microphone, comprising:
a semiconductor integrated circuit according to claim 3 ; and
a diaphragm connected to a gate of the output transistor.
8. A condenser microphone, comprising:
a semiconductor integrated circuit according to claim 4 ; and
a diaphragm connected to a gate of the output transistor.