[time-nuts] Bye-Bye Crystals

Van Horn, David david.vanhorn at backcountryaccess.com
Tue Mar 14 15:16:46 EDT 2017

In my design I need 10ppM, and then I divide by 8.  Software can't correct for anything.

-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at febo.com] On Behalf Of Bob Bownes
Sent: Tuesday, March 14, 2017 10:50 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Bye-Bye Crystals

not to mention +/- a few hundred ppm is not a big deal.

You can always correct for it in software. ;)

On Tue, Mar 14, 2017 at 8:49 AM, jimlux <jimlux at earthlink.net> wrote:

> On 3/14/17 5:04 AM, Bob Camp wrote:
>> Hi
>> The cost difference between a complete oscillator package and a 
>> simple
>>> crystal is tiny.  The osc is often cheaper if you include board 
>>> space or engineering time.
>> Purchased in volume, the difference it the price of a crystal vs a 
>> complete XO is enormous. You will see at least a 10:1 cost savings on 
>> the crystal and likely more than that.  Simply attaching a crystal to 
>> the internal oscillator inside a chip is nearly zero engineering 
>> cost.  If your product is cost sensitive and not super tight 
>> tolerance … you go with the crystal.
> And that crystal business (gazillions of inexpensive 16 MHz crystals) 
> is very different from making an approximately 12 MHz crystal used in 
> a VCXO that will be FMed and multiplied up by 36 to make a 430 MHz 
> transmitter, oh, and that matches whatever temperature compensation 
> scheme GE used in 1970.
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