Henry Hallam wrote:
On Wed, Aug 4, 2010 at 1:50 PM, Bruce Griffiths
<bruce.griffi...@xtra.co.nz> wrote:
The TCXO output waveform is presumably a clipped sinewave as required by the
SE4120L?
I posted the waveform at
http://www.pericynthion.org/stuff/KT3225_500mV_per_div.jpg
Does that count as clipped sine? If not, it seems to work anyway.
Its something like a clipped sine albeit with some ringing as it is clipped.
It more closely resembles a low pass filtered square wave.
In which case a linear distribution amplifier is probably required.
With only a ~3V supply available, options for the distribution amplifier
topology are somewhat limited.
I'm making a custom board that will include the TCXO and distribution
amplifier (as well as some digital stuff to allow the 4 receivers to
communicate), so it can have whatever power supplies it needs.
In principle you could use an emitter follower driving 4 other emitter
followers with a resistor in series with the emitters of the output devices
and the AC coupled loads to match the source to the interconnecting cable
impedance to minimise reflections without requiring excessive dissipation in
the emitter followers.
With the low voltage supply available, using an RF choke is series with the
emitter follower's emitter to ground resistor will also be useful in
achieving the required dynamic range.
Thanks.
Henry
Bruce
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