Re: Hi Speed Comparator operation
Hi Rich,toggle quoted messageShow quoted text
there were a couple of mistakes on the PCBs depending on the version.
All from memory, and still waking up this morning !
Missing ground on the little 5v regulator.
O/P from the op amp to wrong pin on next chip.
Think I biased up the opamp o/p after coupling cap to centre the waveform better.
One of the divider tracks was wrong too.
(missing track or wrong legend on PCB).
Feedback for the divider chain needed adjusting (I had used an alternative MMIC).
Maybe not obvious, but a track(s) needs cut depending on the configuration, and wires run in.
Sure I used an alternative opamp in the end, the original options hard to get and quite expensive.
Paul has corrected these over the years, but all worth checking - trust nothing !
Will check later to see if I have made any notes on these and my emails to Paul, see if I can be more precise.
Cheers, DAvid GM6BIG
On 20/05/2021 11:04, G8ZHA via groups.io wrote:
I have built a couple of W1GHz projects: a GPS locked 10MHz osillator and a 100MHz PLL board. Each of his circuits uses a LT1116 hi speed comparator to lift the oscilator signal up to 5V CMOS logic levels to feed the dividers.
This email has been checked for viruses by Avast antivirus software.