August 2005
Intermediate to advanced
608 pages
18h 12m
English
Content preview from Current Sources and Voltage References
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296
Creating current sources with op amps
the common-mode input voltage is limited by PADs 3 and 4, to the amount of the sup-
ply rails. Using dual PADs (DPADs) would save space. Particular JFETs, such as
those listed below, can attain less than 10 pA at 25˚C:
2N4117/A, 2N4118/A, 2N4119/A
PN4117/A, PN4118/A, PN4119/A
SST4117, SST4118, SST4119
2N4416/A (in very-high-speed circuits)
In addition, dedicated discrete pico-amp diodes such as the PAD, JPAD, or SSTPAD
series can attain less than 5 pA. Dual versions are also available in the form of
DPAD and SSTDPAD families. These devices are made by Calogic, Central Semi-
conductor, InterFet, Linear Integrated ...
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