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AssigneeCirrus Logic International Semiconductor Ltd.
InventorsAxel Thomsen, Paul Wilson, Aleksey Khenkin
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Extended dynamic range of a Micro-Electro-Mechanical System (MEMS) microphone circuit is accomplished in low-noise amplifier circuits and their methods of operation. The circuits are amplifier circuits receive an input signal from a MEMS microphone, and include an input terminal for connection the microphone, a low-noise amplifier having an input coupled to the input terminal, and a capacitively-coupled instrumentation amplifier (CCIA) having an input coupled to an output of the low-noise amplifier. The circuit also includes at least one additional signal path having inputs coupled to the output of the low-noise amplifier and that bypasses the CCIA to provide an alternative signal path, and a switching circuit for clamping the inputs of the CCIA to a common-mode voltage of the circuit while the signal level is greater than the threshold signal level.
A circuit for receiving an input signal from a microelectromechanical system (MEMS) microphone, the circuit comprising:
A method of preventing overload in a circuit that receives an input signal from a microelectromechanical system (MEMS) microphone, the method comprising:
Dependencies are inferred from the claim text.