Attila,
That is a most excellent signature.
I understood exactly to what you were referring after the first line.
DaveD
On 8/29/2015 12:06 PM, Attila Kinali wrote:
Hi,
I've been again reading a bit and stumbled over a few application
notes by Jim Williams. What stuck out on those, that he uses at times
JFET differnetial pairs as a kind of pre-amplifier before opamps (e.g. [1], [2])
The only reason I can think of using JFETs is low gate input leakage.
But in [1], the LSK389 has a specified max input leakage of 200pA
while the LTC6241 has 75pA.
Could someone be so kind and enlighten me, why a JFET diff pair
makes sense in such applications?
Attila Kinali
[1] "40nVpp Noise, 0.05uV/°C Drift, Chopped FET Amplifier",
by Jim Williams, 2006
http://www.linear.com/product/LTC6241 (page 39)
[2] "1Hz to 10MHz V->F Converter",
http://cds.linear.com/docs/en/application-note/an13f.pdf (page 8)
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