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R_Colin_Johnson
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Re: MEMS Microphones
R_Colin_Johnson   4/3/2014 4:26:30 PM
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Yes, that should be "higher" SNR, just as I believe your last question should be "does SNR increase as size shrinks". The trends are to smaller sizes--already die sizes are dipping below 1 mm--but I don't believe scaling is the sole contributor to higher SNR.

krisi
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Re: MEMS Microphones
krisi   4/3/2014 2:47:51 PM
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I am pretty sure Colin menat higher SNR...agred, it woud be nice to get more technical details

krisi
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Re: MEMS Microphones
krisi   4/3/2014 2:42:00 PM
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thank you Colin....interesting enough I don't recognize the top 3 names...I thought Analog Devices, STM and Boesh would be in that group (I guess Invensesne kind of is proxy for ADI)

R_Colin_Johnson
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Re: MEMS Microphones
R_Colin_Johnson   4/3/2014 2:38:41 PM
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According to IHS Knowles is way out front in the top 10 followed by AAC, Invensense (through its acquisition of Analog Device MEMS mic business), Goertek, STMicroelectronics, Hosiden, BSE, Wolfson, Bosch and NeoMEMS.

zeeglen
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Re: MEMS Microphones
zeeglen   4/3/2014 2:37:42 PM
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The author wrote "Vendors are demanding, and getting, lower signal-to-noise (SNR) specs for sensing the softest sounds,..."

Shouldn't that be higher signal-to-noise specs?

Interesting uses for these micro-mics, but would be nice to get some technical info as well - how they are fabricated, how small they can be made, does SNR reduce as size shrinks, etc?

krisi
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Re: MEMS Microphones
krisi   4/3/2014 2:29:42 PM
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24% annual growth, pretty impressive...who is the market leader?

R_Colin_Johnson
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Re: MEMS Microphones
R_Colin_Johnson   4/3/2014 2:08:59 PM
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Its the voice command algorithms that do that magic, but the old "garbage-in garbage-out" rule applies here too, in that the higher definition the MEMS mic, the more accurate will be the recognition of voice commands.

elctrnx_lyf
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MEMS Microphones
elctrnx_lyf   4/3/2014 3:55:57 AM
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Looks like the microphones will play a huge role in making sure the voice command of any smart phone will work accurately.



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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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