jimlux wrote:
Javier Herrero wrote:
El 09/12/2010 15:21, jimlux escribió:
Javier Herrero wrote:
Good to know. Now I see what not to use :) I was supposing that the
hysteresis would not be so high being low voltage signalling, and
since they are used for low-jitter applications. But really I've
only used them for their intended main applications :)
hysteresis is in the 100mV minimum range, and max peak amplitude is
in the 0.9 to 1 Volt range (they'll have a bias point a bit over a
volt, and a lot of them do not do well at all if you swing close to
the supply rail)
Maybe with external clamps and over drive it.
Yes, I was thinking in that way. But surely they are better solutions :)
hence my question to the list..
I'm going to gather all the responses and summarize them for the list
later today.
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Since noise modulation (power supply and device noise) of device
parameters (eg collector base capacitance) can be a significant source
of phase noise adding some emitter degeneration in a long tailed pair
and shunting the collector load resistors with inductors (eg a
transformer winding) should be an effective way of reducing such phase
noise. A capacitor shunting the collector load can also be effective in
reducing the circuit bandwidth closer to the optimum and desensitising
the circuit bandwidth to device parameter variations. However avoiding
high Q parasitic resonances with the output inductors (or transformer)
will be necessary.
Bruce
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