Voltage supply circuit, power supply circuit, microphone unit using the same, and microphone unit sensitivity adjustment method
First Claim
Patent Images
1. A voltage supply circuit comprising:
- a power supply booster;
an amplifier operating with a voltage generated by the power supply booster as a power supply voltage and supplying a bias voltage to a sensor; and
an output voltage setting part including a feedback resistor for the amplifier, the feedback resistor having resistance determined according to a set value of a bias voltage of the sensor.
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Abstract
A voltage supply circuit includes a power supply booster, an amplifier operating with a voltage generated by the power supply booster as a power supply voltage and supplying a bias voltage to a sensor, and an output voltage setting part including a feedback resistor for the amplifier. The feedback resistor has resistance determined according to a set value of a bias voltage of the sensor.
46 Citations
25 Claims
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1. A voltage supply circuit comprising:
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a power supply booster;
an amplifier operating with a voltage generated by the power supply booster as a power supply voltage and supplying a bias voltage to a sensor; and
an output voltage setting part including a feedback resistor for the amplifier, the feedback resistor having resistance determined according to a set value of a bias voltage of the sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A microphone unit comprising:
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a microphone receiving a bias voltage;
a power supply booster;
an amplifier operating with a voltage generated by the power supply booster as a power supply voltage and supplying a bias voltage to the microphone; and
an output voltage setting part including a feedback resistor for the amplifier, the feedback resistor having resistance determined according to a set value of a bias voltage of the microphone. - View Dependent Claims (10)
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11. A power supply circuit supplying a bias voltage to a microphone unit including an amplifier, a capacitor and a capacitor microphone, the power supply circuit comprising:
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a voltage supply circuit generating a predetermined bias voltage from a voltage supplied from outside and supplying the bias voltage to the capacitor microphone through a resistor;
the resistor with one end connected to an output end of the voltage supply circuit; and
a discharger with one end connected to another end of the resistor and with another end connected to one of a ground terminal of the power supply circuit or the output end of the voltage supply circuit. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. A method of adjusting a sensitivity of a microphone, comprising:
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inputting a reference tone to a microphone;
comparing an output of the microphone for the reference tone with a reference voltage;
outputting a set value for setting a bias voltage to be biased to the microphone based on a comparison result; and
storing the set value and determining a feedback resistance value of an amplifier for outputting the bias voltage based on the set value.
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Specification