Biasing circuit
AssigneeNuvoton Technology Corporation
InventorPao-Shu Chang
Life of this patent
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Abstract
A biasing circuit providing power to a microphone is disclosed. The biasing circuit includes a first impedance element, a second impedance element, a detection circuit and a control circuit. The first impedance element has a first impedance and is coupled between a first power node and a first terminal of the microphone. The second impedance element has a second impedance and is coupled between a second terminal of the microphone and a second power node. The detection circuit is coupled between the first and second terminals and generates a detection signal according to an analog signal generated by the microphone. The control circuit adjusts the first and second impedances according to the detection signal.
Claims9
A biasing circuit adapted to provide power to a microphone which generates an analog signal according to environmental sound, and the biasing circuit comprising:
- a first impedance element having a first impedance and coupled between a first terminal of the microphone and a first power node;
- a second impedance element having a second impedance and coupled between a second terminal of the microphone and a second power node;
- a detection circuit coupled between the first terminal and the second terminal, and configured to generate a detection signal according to the analog signal;
- and
- a control circuit configured to adjust the first impedance and the second impedance according to the detection signal;
- wherein responsive to the control circuit being operated in a standby mode, the control circuit increases the first impedance and the second impedance, and responsive to the control circuit being operated in a normal mode, the control circuit decreases the first impedance and the second impedance.
Dependencies are inferred from the claim text.