August 2005
Intermediate to advanced
608 pages
18h 12m
English
Content preview from Current Sources and Voltage References
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Using JFETs to create ultra-low-leakage diodes
Circuit E shows how using a CRD instead of the normal drain resistor can increase the
voltage gain for this JFET amplifier. The CRD’s high output impedance is the differ-
ence here.
In Circuit F, a CRD replaces the normal source resistor, thereby increasing the JFET
amplifier’s negative supply rejection.
6.6 Using JFETs to create ultra-low-leakage diodes
Dedicated low-leakage diodes typically have leakage currents in the low nano-amp
range, which in some situations can actually degrade a precision measurement circuit.
For example, the very-low-input bias-currents of some precision op amps are in the
pico-amp ...
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