> What is the general feeling here about this issue? I confess that if the amp
> output is transformer coupled, I see exactly zero benefit in a grounded
> connector as the feed from the amplifier.
This question comes up every so often. It comes down to whether you want your
test setup to look
Scott wrote:
Parasitic capacitance on the inverting terminal from routing and the
input capacitance of the opamp itself, adds another pole to your opamp's
loopgain, burning phase margin.
A small compensation cap across the top leg of your feedback divider, would
boost your phase margin.
Walter said:
"Also on an unrelated topic, I found an HP 59309A HPIB clock on a forgotten
shelf and looked at it, and was surprised to see such a poor primary time
standard oscillator inside, just a 1Mhz crystal using a cmos buffer oscillator.
It can accept an external standard, but it did feel
> Also on an unrelated topic, I found an HP 59309A HPIB clock on a forgotten
> shelf
> and looked at it, and was surprised to see such a poor primary time standard
> oscillator inside, just a 1Mhz crystal using a cmos buffer oscillator. It can
> accept an external standard, but it did feel odd
Hi
The gotcha with transformer coupled coax is keeping it terminated over a wide
range of frequencies. If the coax is miss terminated
and the end of the cable is floating, you have a pretty good opportunity for
noise to get into the system. Floating shields are also a
pretty good way to get
Nice project. The gain peaking is more than likely from your high speed
opamp. Parasitic capacitance on the inverting terminal from routing and the
input capacitance of the opamp itself, adds another pole to your opamps
loopgain, burning phase margin.
A small compensation cap across the top leg
Hi
The real question is: Do you have an application where < 100 ps matching
matters? If so do you
need to match both at the amplifier *and* at the ends of the cables?
Other than a phased array radar, I can’t think of to many situations where the
answer is yes …
Put another way, for the
I notice that in the distribution amp being discussed at the moment,
the BNC output connectors are grounded, and tied to the chassis,
which in turn has a grounded emi line filter. this seems like an unavoidable
noise pathway to me.
I notice that some commercial amps are grounded, but more
Hello,
>The picture gallery also shows a pulse distribution amp for 1PPS. It has an
LT1711 comparator feeding an 74AC14 buffer with length-matched traces to
74AC04's at the outputs. So far my length-matching didn't give zero
output-skew between the outputs - I see around 150-200ps skew which I
anders.e.e.wal...@gmail.com said:
> I see around 150-200ps skew which I tried to tune a bit with wires and 0R
> resistors - without very much success.. any ideas for improving this - or
> just leave it at 200ps skew?
I don't have the numbers handy, but that's ballpark of an inch of trace on a
Hi all,
I've been tinkering with another distribution amplifier design and made
some measurements earlier this week.
The goal is roughly 1:8 fan-out, gain of 0 dB, for good quality (Cs, maser,
OCXO) 5 or 10 MHz signals in the range of maybe +0 dBm to +15 dBm - in a 1U
form-factor.
Earlier I made
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