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italie MAME owes italie many thank yous, hah Reged: 09/20/03 Posts: 15246 Loc: BoomTown Send PM Re: Xtal compensation theory 101: Part 2 07/03/12 01:42 PM Reply > > Shown is a plot of a compensated TCXO. This is a more common and less expensive > > compensation method. You ~still~ won't find these in most clocks, at $2-10 a pop. > > This compensation method usually utilizes some form of reverse error generation > > applied to a crystals natural error curve. Generally you would run a crystal over > > temperature, capture it's frequency response, and then generate a 4th or 5th order > > polynomial equation for that response. To compensated for the error in any given > > crystal, you then would calculate a second polynomial equation to generate a > > cancellation signal to bring the crystal as near to nominal as possible. There are > > several means by witch to apply that correction to the crystal. All of them have > > their pluses and minuses. > > "Reverse error generation"? "Cancellation signal"? > You mean, as opposed to a lookup table containing values such as "500000" and > "500012"? Yes. One solid difference is that most of these error corrections are generated real time (analog). A digital look-up table would require a huge resolution to be effective at anything other than one very precise fixed temperature (see oven oscilator, the only way this principle works to any degree of accuracy).

Entire thread Subject Posted by Posted on What time is it? (rant) amused 07/02/12 12:46 PM Did an elephant sit on your fence? GatKong  07/02/12 09:51 PM For reasons I can't explain, I love this thread. *nt* Stiletto  07/02/12 05:51 PM Re: What time is it? (rant) Gor  07/02/12 04:21 PM Re: What time is it? (rant) amused  07/02/12 05:05 PM Re: What time is it? (rant) Gor  07/02/12 06:45 PM Re: What time is it? (rant) JWJr  07/02/12 05:25 PM Re: What time is it? (rant) amused  07/02/12 07:18 PM Re: What time is it? (rant) italie  07/02/12 07:30 PM Re: What time is it? (rant) amused  07/02/12 07:36 PM Re: What time is it? (rant) italie  07/02/12 07:48 PM Re: What time is it? (rant) amused  07/03/12 03:45 AM Xtal compensation theory 101: Part 1 italie  07/03/12 05:45 AM Xtal compensation theory 101: Part 2 italie  07/03/12 06:23 AM Re: Xtal compensation theory 101: Part 2 amused  07/03/12 11:04 AM Re: Xtal compensation theory 101: Part 2 italie  07/03/12 01:42 PM Re: Xtal compensation theory 101: Part 2 amused  07/03/12 04:24 PM Re: Xtal compensation theory 101: Part 2 italie  07/03/12 05:29 PM Re: Xtal compensation theory 101: Part 2 Bekki Doll  07/07/12 12:05 AM Re: Xtal compensation theory 101: Part 2 Vas Crabb  07/03/12 04:27 PM Re: Xtal compensation theory 101: Part 2 Gor  07/03/12 05:20 PM Xtal compensation theory 101: Part 3 italie  07/03/12 07:25 AM Re: What time is it? (rant) lharms  07/02/12 10:01 PM Re: What time is it? (rant) amused  07/03/12 03:50 AM Just one question (yes, only one) italie  07/02/12 02:02 PM Re: Just one question (yes, only one) amused  07/02/12 02:40 PM Re: Just one question (yes, only one) Tomu Breidah  07/02/12 03:52 PM Re: Just one question (yes, only one) italie  07/02/12 03:47 PM Re: Just one question (yes, only one) amused  07/02/12 04:02 PM Re: Just one question (yes, only one) italie  07/02/12 04:22 PM Re: Just one question (yes, only one) amused  07/02/12 05:07 PM Re: Just one question (yes, only one) italie  07/02/12 07:51 PM Re: Just one question (yes, only one) TriggerFin  07/02/12 08:36 PM Re: Just one question (yes, only one) italie  07/02/12 09:07 PM

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