Time-domain multiplexed signal processing block and method for use with multiple MEMS devices
First Claim
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1. A sense channel system comprising:
- a signal processing module having an input section coupled to an analog output section of each of a plurality of MEMS devices and further having an output section,wherein the signal processing module processes signals from the analog output section of each of the plurality of MEMS devices in a multiplexed, time domain manner, andthe signal processing module includes a zero-IF mixer configured to demodulate output signals from the plurality of MEMS devices, the zero-IF mixer having a plurality of internal circuit branches associated with the plurality of MEMS devices, respectively.
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Abstract
A sense channel signal processing block is time-domain multiplexed among multiple MEMS devices and utilizes an anti-aliasing filter disposed after track-and-hold switches, to prevent the bandwidth of the sense channel from being limited by the anti-aliasing filter.
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Citations
20 Claims
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1. A sense channel system comprising:
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a signal processing module having an input section coupled to an analog output section of each of a plurality of MEMS devices and further having an output section, wherein the signal processing module processes signals from the analog output section of each of the plurality of MEMS devices in a multiplexed, time domain manner, and the signal processing module includes a zero-IF mixer configured to demodulate output signals from the plurality of MEMS devices, the zero-IF mixer having a plurality of internal circuit branches associated with the plurality of MEMS devices, respectively. - View Dependent Claims (2, 3, 4, 5, 6, 13, 16, 19)
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7. A sense channel apparatus comprising:
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a) a plurality of trans-impedance amplifiers each having an input section for receiving an analog output signal from one of a plurality of MEMS devices and an output section coupled to an input of a programmable gain amplifier; b) a zero-IF mixer having a plurality of internal circuit branches associated with the plurality of MEMS devices, respectively, operatively coupled intermediate an output of the programmable gain amplifier and an input of a rate amplifier; c) a plurality of rate amplifier switches, each having an input section coupled to an output of the rate amplifier; and d) a plurality of filters, each having an input coupled to an output of one of the plurality of rate amplifier switches. - View Dependent Claims (8, 9, 14, 17, 18, 20)
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10. A method of multiplexing an output of a plurality of MEMS devices through a single sense channel comprises:
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A) providing a signal processing module having an input section coupled to output sections of the plurality of MEMS devices, respectively, and further having an output section, and B) processing signals from the output sections of the plurality of MEMS devices in a multiplexed, time domain manner, wherein the signal processing module includes a zero-IF mixer having a plurality of internal circuit branches associated with the plurality of MEMS devices, respectively. - View Dependent Claims (11, 12, 15)
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Specification