Buffer/Split Quick Questions

[aziltz]

I'm wanting to buffer a signal that is being split to two non-inverting opamps via a JFET Buffer stage(s) like the AMZ Buffer.

http://www.muzique.com/lab/splitter.htm

I have it working on the breadboard with just a single FET stage driving both paths, ie two coupling caps coming from the emitter.


Is there any reason to follow Jack's Splitter Topology instead?  To take two JFet's in parallel, tie the gates together for the input, and send the emitters/outputs down different paths?

[R.G.]

Think about impedance.

[aziltz]

Think about impedance.

The non-inverting opamp stages I'm wanting to drive are high input impedance, but I think the biasing network at the V+ input is reducing that high-impedance. 

If I use "noiseless" biasing with 1M or higher from V+ to Vref, I should still have a high enough impedance and not have to worry about driving two stages in parallel?