Transcription of AN-32 FET Circuit Applications
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AN-32 FET Circuit Applications
LM101,LM103AN-32 FET Circuit ApplicationsLiterature Number: SNOA620TL/H/6791 FET Circuit ApplicationsAN-32 National SemiconductorApplication Note 32 February 1970 FET Circuit Applications *Polycarbonate dielectricTL/H/6791 1 Sample and Hold With Offset AdjustmentThe 2N4339 jfet was selected because of its low lGSS(k100 pA), very-low lD(OFF)(k50 pA) and low pinchoff volt-age. Leakages of this level put the burden of Circuit perform-ance on clean, solder-resin free, low leakage Circuit 2TL/H/6791 3 Long Time ComparatorThe 2N4393 is operated as a Miller integrator. The high Yfsof the 2N4393 (over 12,000mmhos@5 mA) yields a stagegain of about 60. Since the equivalent capacitance lookinginto the gate is C times gain and the gate source resistancecan be as high as 10 MX, time constants as long as aminute can be AC Coupled IntegratorThis Circuit utilizes the m-amp technique to achieve veryhigh voltage gain.
TL/H/6791–16 Level-Shifting-Isolation Amplifier The 2N4341 JFET is used as a level shifter between two op amps operated at different power supply voltages.
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