As I recall, a stock UGS does not have an open loop figure
anywhere near that high. You can modify it for that tho,
(he asked, wondering why you would want that)
yeah I made the calculation and OL is not more than 17-20dB.
Eventually more gain could be achieved by adding a second buffer stage and closing the loop with that, although it would be nice to have very linear jfets, as good as Jk74/170, but with very high transconductance to be able to achieve that sort of gain with just one stage
.In this fashion anyways OL will go high enough to achieve 40-50dB gain.
Nelson I have a question though regarding phase response:
I am sure you have the possibility to make frequeny and phase response of your gears.
What do you consider a good phase response?
I know there is correlation with phase delay and fidelity on the reproduction and phase vs. OL/CLG i.e. FB gain as well.
Should the phase be as linear as possible? Should it be as close to 0 as possible?
I know the latter is the ideal although pretty impossible
Should I look at log(phase) or linear scale across let's say 10Hz 10MHz?
I am taking measuraments with the Vector analyzer HP4395A and using the Tek scope MSO9000 the 1Ghz mixed signal scope.
I am interested to know what you think about phase response.
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