Configurable microphone using internal clock changing
AssigneeInfineon Technologies AG
InventorsDietmar Straeussnigg, Daniel Neumaier
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Abstract
A method of operating a microelectromechanical system (MEMS) includes, in a first operational mode, converting an analog output of the MEMS into a first internal data stream and a first external data stream having a first sampling rate; transitioning from the first operational mode to a second operation mode without restarting the MEMS; and in the second operational mode, converting the analog output of the MEMS into a second internal data stream having a second sampling rate different from the first sampling rate, and performing a sampling rate conversion of the second internal data stream to generate a second external data stream.
Claims19
A method of operating a microelectromechanical system (MEMS), the method comprising:
- in a first operational mode, converting an analog output of the MEMS into a first internal data stream and a first external data stream having a first sampling rate;
- transitioning from the first operational mode to a second operation mode without restarting the MEMS;
- and
- in the second operational mode, converting the analog output of the MEMS into a second internal data stream having a second sampling rate different from the first sampling rate, and performing a sampling rate conversion of the second internal data stream to generate a second external data stream.
A circuit comprising:
- a clock divider having an input coupled to a clock signal input;
- a multiplexer having a first input coupled to an output of the clock divider, a second input coupled to the clock signal input, a third input coupled to a control signal input, and an output, wherein the multiplexer couples the first input to the output or couples the second input to the output according to a state of the control signal input;
- a signal processing circuit having an analog signal input, a clock signal input coupled to the output of the multiplexer, and a digital signal output comprising one or more output nodes;
- and
- a frequency converter coupled between the digital signal output of the signal processing circuit and a data stream output, wherein a conversion factor of the frequency converter is determined according to the state of the control signal input.
A microelectromechanical (MEMS) circuit in a single package comprising:
- a control signal input, a clock signal input, and a data stream output for providing a constant rate single bit output stream at one or more output nodes;
- a MEMS device;
- and
- a signal processing circuit coupled to the MEMS device, to the control signal input, to the clock signal input, and the data stream output,
- wherein, in a first mode of operation determined by a first state of the control signal input, at least a portion of the signal processing circuit is directly coupled to the clock signal input, and wherein, in a second mode of operation determined by a second state of the control signal input, the at least a portion of the signal processing circuit is coupled to the clock signal input through a clock divider.
Dependencies are inferred from the claim text.