simplest current feedback jfet op-amp buffer, gain of 1
vsupply+ vdd 0 dc 15V
vsupply- vss 0 dc -15V
v1 vin 0 dc 0 ac 1 sin 0 0.001V 1kHz
j1 j1d vin j1s lsk170a
* trim rs for zero output offset
rs j1s vout 77.31
q1 vout j1d vdd 2n3906
rbe vdd j1d 390
cc vdd j1d 68n
rl vout vss 1k
.include ./lsk170.txt
.include ./models1.txt
.end
.control
noise v(vout) v1 dec 25 20Hz 20kHz
setplot noise2
print all
dc v1 0 0 0
setplot dc1
print vout
ac dec 10 10Hz 1THz
setplot ac1
set unit=degrees
plot vdb(vout)
.endc