Reference voltage generator for Pipelined ADC

[AOQ]

Dear all :

as the attachment shown, the reference voltage generator ( for Pipelined ADC

testing PC Board) is implemented by two resistors, two capacitors, and two unit

gain buffer.

My questions are as follows:

1. What's the purpose to add two 10Kohm resistors in series in the positive input

node of OPamp ? since there is no current flow into such branch ?

2. why add a 10uF capacitor between positive and negative input node ?
I think maybe it is used to bypass high frequency noise, but I dont know how

3. Should I need to add bypass capacitors network (10uF, 1uF, 0.1uF) after

the reference voltage generator output ( Vref+ and Vref- ) ?

I am afraid that such large capacitive load will cause the OPamp to oscillate ...

If i add a inductor (100uH) between the reference generator output and

bypass network, will it help ?

4. About the unit gain buffer, sometimes i see someone not to connect Opamp

output to negative input node directly, but to add a resistor ( maybe 5kohm)

between Vout and Vin- , why ? @@


Thanks for any response .

Best Regards