Microphone assembly
AssigneeKnowles Electronics, LLC
InventorAndrzej Pawlowski
Life of this patent
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Abstract
The disclosure describes devices and methods for implementing impedance matching. The device may be implemented on an integrated circuit that includes a communication protocol interface circuit, a first signal output terminal, a first output driver circuit, and a controller. The first output driver circuit is coupled to the controller and has a corresponding plurality of parallel driver stages, each driver stage including a driver and a configurable resistance coupling an output of the driver to the first signal output terminal (e.g., first contact). The configurable resistances of the first output driver form a first series terminated resistance. The controller is configured to adjust the configurable resistances to adjust the first series terminated resistance.
Claims23
A digital microphone assembly configured to be integrated with a host device, the assembly comprising:
- a housing having a host interface;
- a microelectromechanical systems (MEMS) transducer disposed in the housing;
- and
- an integrated circuit disposed in the housing, the integrated circuit comprising:
- a signal processing circuit coupled to an output of the transducer;
- an interface protocol circuit coupled to an output of the signal processing circuit;
- a first output driver circuit coupled to the interface protocol circuit and having a corresponding plurality of parallel driver stages, each driver stage comprising a driver and a configurable resistance coupling an output of the driver to a first contact of the host interface, wherein the configurable resistances of the first output driver circuit form a first series terminated resistance;
- and
- a controller coupled to the first output driver circuit and configured to adjust the first series terminated resistance by adjusting the configurable resistance of at least one driver stage of the first output driver circuit.
An integrated circuit for a micro-electro-mechanical systems (MEMS) microphone assembly, the integrated circuit comprising:
- a first signal output terminal connectable to an external device interface of a MEMS microphone assembly;
- a first output driver circuit having a corresponding plurality of parallel driver stages, each driver stage comprising a driver and a configurable resistance coupling an output of the driver to the first signal output terminal,
- wherein the configurable resistances of the first output driver circuit form a first series terminated resistance;
- and
- a controller coupled to the first output driver circuit and configured to adjust the first series terminated resistance by adjusting the configurable resistance of at least one driver stage of the first output driver circuit.
An integrated circuit, comprising:
- a communication protocol interface circuit;
- a first signal output terminal;
- a first output driver circuit having an input coupled to the communication protocol interface circuit, the first output driver circuit having a corresponding plurality of parallel driver stages, each driver stage comprising a driver and a configurable resistance between an output of the driver and the first signal output terminal, wherein the configurable resistances of the first output driver circuit form a first series terminated resistance coupling the first output driver circuit to the first signal output terminal;
- and
- a controller coupled to the first output driver circuit and configured to adjust the first series terminated resistance by adjusting the configurable resistance of at least one driver stage of the first output driver circuit,
- wherein an impedance at the first signal output terminal is configurable by adjusting the first series terminated resistance.
Dependencies are inferred from the claim text.