Re: [time-nuts] Advice on 10 MHz isolation/distribution / PhaseNoise of 74AC gates

2010-02-26 Thread John Miles
Hi, Garry -- I knew from other people's measurements that 74AC was capable of better than -160dBc/Hz when used to make a phase detector at 10MHz, but I wanted to do a quick feasibility check on a divider for an application a couple of years ago. The 74AC163 was powered from a linear bench

Re: [time-nuts] Advice on 10 MHz isolation/distribution / PhaseNoise of 74AC gates

2010-02-26 Thread Bob Camp
Hi That plot is very similar to what I have seen on AC gates. The usual mumble words apply - that was 15 years ago and semiconductor processes have changed a bit since then. Bob On Feb 26, 2010, at 5:54 AM, John Miles wrote: Hi, Garry -- I knew from other people's measurements that 74AC