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CMOS Timing Startup Turns to Crystal

8/28/2013 09:00 AM EDT
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Michael S. McCorquodale, Ph.D.
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CMOS Oscillator Status
Michael S. McCorquodale, Ph.D.   8/30/2013 3:43:30 PM
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As some have noted, CMOS oscillators are already in the market from IDT. In fact, CMOS oscillators have replaced XTALs in nearly all USB 2.0 PHYs and the expectation is that the same will be true for USB 3.0. As IDT announced a few years ago, it licensed its CMOS oscillator technology to several USB PHY developers while also supplying die products to others. The point here is that CMOS oscillators are well-suited to wireline communications. As others have noted, they are not well-suited to wireless applications due to the need for low close-to-carrier phase noise. Thus, the change in strategy from eoSemi comes as no surprise. Nevertheless, CMOS oscillators are pervasive, though I have never seen a CMOS oscillator product from eoSemi. To my knowledge, only IDT and its licensees have been shipping CMOS oscillators and products with embedded CMOS oscillators in volume.  

krisi
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Re: MEMS-and-Crystal free CMOS oscillators
krisi   8/29/2013 11:12:28 AM
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thank you Hedley, interestiing insight...would you be interested in giving a talk on this topic at emerging technolgies symposium in Grenoble in 2014? deatils @ www.cmosetr.com


Kris (kris.iniewski@gmail.com)

Peter Clarke
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Re: MEMS-and-Crystal free CMOS oscillators
Peter Clarke   8/29/2013 10:37:46 AM
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In case some people didn't make the connection, Hedley is the CTO at EoSemi.

 

 

Peter Clarke
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Re: MEMS-and-Crystal free CMOS oscillators
Peter Clarke   8/29/2013 10:37:46 AM
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In case some people didn't make the connection, Hedley is the CTO at EoSemi.

 

 

Hedley Rokos
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MEMS-and-Crystal free CMOS oscillators
Hedley Rokos   8/29/2013 10:34:46 AM
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Thank you Peter for your clarifications.  

A little more detail on MEMS-and-Crystal free CMOS oscillators: 

There is admittedly little chance that such oscillators will displace crystals in situations where sideband noise is critical.  The target for eoSemi is timing applications where SXOs or other off-chip components would previously have been used, particularly where it is desirable to integrate the timing circuitry with other parts of the system.  

eoSemi has already demonstrated performance that is superior to anything we know of from IDT.  This is a consequence of a range of proprietary techniques, including circuit designs that minimise the effects of variations in CMOS transistor performance, and specialised strain-compensation algorithms.   We now look both to further improve the performance and to minimise production overhead.

Peter Clarke
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Re: CMOS not replacing crystals
Peter Clarke   8/29/2013 5:36:53 AM
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Well it is complicated.

But there's two things here

EoSemi is going to continue with its CMOS oscillators to replace crystals for wired markets

EoSemi is going to start selling crystal oscillators for some wireless applications.

Peter Clarke
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Re: CMOS oscillators
Peter Clarke   8/29/2013 5:35:08 AM
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If it isn't they won't sell

A lot of the competition for quartz crytsal oscillators is coming from MEMS-based oscillators.

 

 

krisi
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CEO
CMOS not replacing crystals
krisi   8/28/2013 12:39:08 PM
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CMOS technology was supposed to displace crystals who have been used as far as I can remember...so what has changed in this CMOS displaying crystals story?

elctrnx_lyf
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CMOS oscillators
elctrnx_lyf   8/28/2013 12:32:46 PM
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CMOS oscillators are already there in the industry for a while from companies like IDT, is this new technology going to be better than the existing ones?

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