Re: [time-nuts] Metastability in a 100 MHz TIC

2007-07-20 Thread Ulrich Bangert
: Donnerstag, 19. Juli 2007 09:09 An: time-nuts@febo.com Betreff: [time-nuts] Metastability in a 100 MHz TIC ); SAEximRunCond expanded to false Errors-To: time-nuts-bounces+df6jb=ulrich-bangert.de+df6jb=ulrich-bangert [EMAIL PROTECTED] In my Brooks Shera style LPRO rubidium controller

Re: [time-nuts] Metastability in a 100 MHz TIC

2007-07-20 Thread Dr Bruce Griffiths
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Ulrich Bangert wrote: Richard, metastability is an effect that happens when the setup times of an d-flipflop are not met. This can happen (with a certain statistical likelyhood) when the sources of the data input and the clock

Re: [time-nuts] Metastability in a 100 MHz TIC

2007-07-20 Thread Richard H McCorkle
with for some older hobbyists. Thanks again, Richard Original Message - Subject: Re: [time-nuts] Metastability in a 100 MHz TIC From:Tom Van Baak [EMAIL PROTECTED] Date:Fri, July 20, 2007 6:57 am To: Discussion of precise

Re: [time-nuts] Metastability in a 100 MHz TIC

2007-07-20 Thread Richard H McCorkle
Original Message - Subject: Re: [time-nuts] Metastability in a 100 MHz TIC From:Tom Van Baak [EMAIL PROTECTED] Date:Fri, July 20, 2007 6:57 am To: Discussion of precise time and frequency measurement time-nuts@febo.com

Re: [time-nuts] Metastability in a 100 MHz TIC

2007-07-20 Thread Dr Bruce Griffiths
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Tom Tom Van Baak wrote: Bruce, I like your point about the random quantization error in the sawtooth. Yes, that would help the noise by a few dB. On the other hand it would also seem the 10 ns resolution of the TIC is the

Re: [time-nuts] Metastability in a 100 MHz TIC

2007-07-20 Thread Dr Bruce Griffiths
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Alan Melia wrote: Bruce I find this an interesting thread...one maybe naive thought.. it would be nice to have atoo-good stability on the 100MHz TIC but detracts from the averaging (My interpretation), this almost suggests

Re: [time-nuts] Metastability in a 100 MHz TIC

2007-07-20 Thread Tom Van Baak
The simpler and cheaper D flipflop precedence detector used together with hardware sawtooth correction has far higher resolution. It also has the advantage of not requiring any high frequency clocks. Bruce Since Rick Dr TAC brought it up some months ago, does anyone have measurements

Re: [time-nuts] Metastability in a 100 MHz TIC

2007-07-20 Thread Dr Bruce Griffiths
Tom Van Baak wrote: The simpler and cheaper D flipflop precedence detector used together with hardware sawtooth correction has far higher resolution. It also has the advantage of not requiring any high frequency clocks. Bruce Since Rick Dr TAC brought it up some months ago, does

[time-nuts] Metastability in a 100 MHz TIC

2007-07-19 Thread Richard H McCorkle
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] In my Brooks Shera style LPRO rubidium controller I am using the same HC4046 input conditioner and divide down counter on the oscillator and HC4046 phase detector interrupting the PIC as used in the original design. The phase

Re: [time-nuts] Metastability in a 100 MHz TIC

2007-07-19 Thread Dr Bruce Griffiths
); SAEximRunCond expanded to false Errors-To: [EMAIL PROTECTED] Richard H McCorkle wrote: With the discussions here on metastable states in TIC counters, I am asking the experts on the list for their opinion if the performance of this design would improve by adding a shift register