BIASING CIRCUIT FOR MICROPHONE AND MICROPHONE INCLUDING THE SAME
First Claim
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1. A biasing circuit for providing a variable bias voltage to a sensor of a microphone, the biasing circuit comprising:
- a regulator receiving a reference voltage and a control voltage and outputting a variable voltage corresponding to the received control voltage;
a digital to analog converter converting a received digital control signal to the control voltage transmitted to the regulator; and
a charge pump receiving the variable voltage output from the regulator and correspondingly outputting a variable voltage that is higher than the variable voltage.
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Abstract
A microphone in accordance with an exemplary embodiment of the present invention includes a biasing circuit to provide a variable bias voltage to a sensor. The biasing circuit includes: a regulator which receives a reference voltage and a control voltage to output a variable voltage; a digital to analog converter which receives a digital control signal to provide the control voltage to the regulator; and a charge pump which receives the variable voltage output from the regulator to output a variable voltage that is higher than the variable voltage.
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Citations
9 Claims
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1. A biasing circuit for providing a variable bias voltage to a sensor of a microphone, the biasing circuit comprising:
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a regulator receiving a reference voltage and a control voltage and outputting a variable voltage corresponding to the received control voltage; a digital to analog converter converting a received digital control signal to the control voltage transmitted to the regulator; and a charge pump receiving the variable voltage output from the regulator and correspondingly outputting a variable voltage that is higher than the variable voltage. - View Dependent Claims (2, 3, 4, 5)
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6. A microphone comprising:
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a sensor; and a biasing circuit to provide a variable bias voltage to the sensor, wherein the biasing circuit comprises; a low-dropout (LDO) regulator receiving a reference voltage and a control voltage and outputting a variable voltage corresponding to the received control voltage; a digital to analog converter converts a received digital control signal to the control voltage transmitted to the LDO regulator; an oscillator generating a pulse signal; a level shifter receiving the pulse signal from the oscillator and the variable voltage from the regulator, and adjusting the pulse signal to a level of the variable voltage to output the adjusted pulse signal; and a charge pump receiving the variable voltage output from the regulator and the adjusted pulse signal output from the level shifter and correspondingly outputting a variable voltage that is higher than the variable voltage. - View Dependent Claims (7, 8, 9)
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Specification