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Articles
A series of LM317 …
A series of LM317 circuits investigated in simulation and on the test bench for suitability as a current source
Authors
Christopher Paul
Main Document
Article «
A high-performance current source
»
Description
Figure 1
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PDF
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22 Kb
Document Language
English
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Other Materials from the Main Document
Article «
A high-performance current source
»
Figure 1. A series of LM317 circuits investigated in simulation and on the test bench for suitability as a current source
Figure 2. Darlington Q1/Q2 feeds 0-Ω load, V_LOAD, with a current. R2, R5, R4 and C2 establish stability and should be checked in assembled circuits. R1 establishes the minimum Q1 DC bias
Figure 3. The PSRR impedances in ohms verses frequency as seen by V_LOAD for three different DC currents. Higher impedances are associated with more nearly ideal current sources. The dots on the curves represent simulation measurements
Figure 4. The Impedance in ohms seen by V_LOAD at three different DC currents. Higher impedances are associated with more nearly ideal current sources. The dots on the curves represent simulation measurements
Figure 5. Transfer impedances in ohms verses frequency from V_IN to V_LOAD. The design goal is a value of 1.0000. The dots on the curves represent simulation measurements
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