Re: [time-nuts] Zero-Crossing Detector Design?

2012-07-22 Thread Magnus Danielson
On 07/22/2012 01:39 AM, Bob Camp wrote: HI The Collins paper that Bruce referred to is the standard work on limiters / jitter / bandwidth. It can't and doesn't address all the possible issues in a full blown design. The math for the basic approach is all there though. Indeed. It's a good

Re: [time-nuts] Zero-Crossing Detector Design?

2012-07-22 Thread ehydra
Maybe, it is on my list for the university IEEE download for months. And this is the only reference? I have seen some similar issues in a few BPSK receiver papers. Not for time-nuting but for S/N. - Henry Magnus Danielson schrieb: On 07/22/2012 01:39 AM, Bob Camp wrote: HI The Collins

Re: [time-nuts] Zero-Crossing Detector Design?

2012-07-22 Thread Bob Camp
Hi There are papers on limiters in radio IF's going back at least into the 1930's. That's a long... list. Bob On Jul 22, 2012, at 3:36 PM, ehydra wrote: Maybe, it is on my list for the university IEEE download for months. And this is the only reference? I have seen some similar issues in

Re: [time-nuts] Zero-Crossing Detector Design?

2012-07-22 Thread Bill Fuqua
Wow, I have not checked this list for some time. But there is a lot said about zero crossing detectors. Lots and lots of replies, so many that I have not looked at all of them. 1. Do not use CMOS inverters. Even though so much has been published on using these in linear mode by adding a

Re: [time-nuts] Zero-Crossing Detector Design?

2012-07-22 Thread Bob Camp
Hi The feedback inverter is indeed a problem with fast logic, just bias it to mid point off the supply instead. Narrow filters can be both a good and a bad thing at the same time. They clean up the signal, but the also have delay. If they are narrow enough they have lots of delay. That would

Re: [time-nuts] Zero-Crossing Detector Design?

2012-07-22 Thread Didier Juges
Narrow filters have high tempco on their group delay, so that's no good either. Didier KO4BB Bill Fuqua wlfuq...@uky.edu wrote: Wow, I have not checked this list for some time. But there is a lot said about zero crossing detectors. Lots and lots of replies, so many that I have not looked at

Re: [time-nuts] Zero-Crossing Detector Design?

2012-07-22 Thread Richard (Rick) Karlquist
On 7/22/2012 2:41 PM, Bob Camp wrote: Hi The feedback inverter is indeed a problem with fast logic, just bias it to mid point off the supply instead. 1. Do not use CMOS inverters. Even though so much has been published on using these in linear mode by adding a feedback resistor, they