MICROPHONE BIASING
First Claim
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1. An apparatus comprising:
- a plurality of microphones coupled to receive a bias current in series.
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Abstract
A plurality of microphones are coupled in series to receive a bias current. A plurality of configurable switches may be used to select which ones of the microphones receive the bias current. The current source may be adjustable and the switches may be reconfigurable to dynamically change both the number of microphones being used and the amount of bias current being generated.
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Citations
21 Claims
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1. An apparatus comprising:
a plurality of microphones coupled to receive a bias current in series. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus comprising:
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a plurality of microphones configurable to be coupled in series; a current source coupled to supply a bias current to an input of a configurable one of the microphones; and a ground node coupled to an output of one of the microphones. - View Dependent Claims (9, 10)
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11. A method of operating a plurality of microphones comprising:
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providing a bias current to a first input node of a first microphone; and providing the bias current to a second input node of a second microphone that is serially connected to an output node of the first microphone to receive the bias current. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19)
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20. An apparatus comprising:
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a current source; a plurality of switches to supply one of a plurality of input/output terminals with a bias current from the current source according to configuration of the switches; and a plurality of amplifiers coupled to the plurality of terminals to amplify respective voltages present on the input/output terminals. - View Dependent Claims (21)
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Specification