System and method for high input capacitive signal amplifier
First Claim
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1. A method comprising:
- determining an amplitude of an input signal provided by a microphone;
compressing the input signal in an analog domain to form a compressed analog signal based on the determined amplitude;
converting the compressed analog signal to a compressed digital signal; and
decompressing the compressed digital signal in a digital domain to form a decompressed digital signal.
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Abstract
In accordance with an embodiment, a method includes determining an amplitude of an input signal provided by a capacitive signal source, compressing the input signal in an analog domain to form a compressed analog signal based on the determined amplitude, converting the compressed analog signal to a compressed digital signal, and decompressing the digital signal in a digital domain to form a decompressed digital signal. In an embodiment, compressing the analog signal includes adjusting a first gain of an amplifier coupled to the capacitive signal source, and decompressing the digital signal comprises adjusting a second gain of a digital processing block.
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Citations
25 Claims
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1. A method comprising:
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determining an amplitude of an input signal provided by a microphone; compressing the input signal in an analog domain to form a compressed analog signal based on the determined amplitude; converting the compressed analog signal to a compressed digital signal; and decompressing the compressed digital signal in a digital domain to form a decompressed digital signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An audio system comprising:
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a microphone; a variable gain amplifier comprising an input node coupled to the microphone; an analog to digital converter coupled to an output of the variable gain amplifier; a digital gain block coupled to an output of the analog to digital converter; and a gain control circuit configured to measure an amplitude of an analog signal coupled to the variable gain amplifier, adjust a first gain of the variable gain amplifier according to a first gain function, and adjust a second gain of the digital gain block according to a second gain function. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A packaged microphone system comprising:
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a microphone disposed on a package substrate; and a first circuit system disposed on the package substrate, the first circuit system including a signal amplifier comprising an input node configured to be coupled to microphone, a peak detector coupled to an output of the signal amplifier, a gain controller coupled to an output of the peak detector, a controllable attenuation circuit coupled to the input node of the signal amplifier and to a first gain control signal of the gain controller, an analog to digital converter coupled to an output of the signal amplifier, a digital filter coupled to an output of the analog to digital converter, and a gain coefficient control block coupled to the digital filter and to a second gain control signal of the gain controller, wherein the gain controller is configured to increase an attenuation of the controllable attenuation circuit or decrease a gain of the signal amplifier in response to an increased amplitude of the microphone and increase a gain of the digital filter in response to the increased amplitude of the microphone. - View Dependent Claims (22, 23, 24, 25)
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Specification