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Entry  Mon Aug 12 11:51:38 2019, Shalika Singh, Noise Budget, 2micronLasers, Noise Analysis of Voltage Regulator using SR785 Spectrum Analyser regulator.pdfNoise_across_Voltage_Regulator_Circuit.pdf
    Reply  Mon Aug 12 15:17:05 2019, Koji, Noise Budget, 2micronLasers, Noise Analysis of Voltage Regulator using SR785 Spectrum Analyser 
Message ID: 2391     Entry time: Mon Aug 12 11:51:38 2019     Reply to this: 2393
Author: Shalika Singh 
Type: Noise Budget 
Category: 2micronLasers 
Subject: Noise Analysis of Voltage Regulator using SR785 Spectrum Analyser 

Referring to elog entry QIL:2387. I did the correction with the voltage supply and now provided a supply of 18V(+/-) to LM7815 and LM7915. The position of diodes was also corrected for LM7915. The Electrolytic Capacitors(100uf) I am using are getting heated when using with LM7915 only. I didn't find any tantalum capacitors of 100uf in EE shop. Should they be replaced with some other capacitors?

Attachment 1: The Circuit Diagram Voltage regulator

The component used                   Input Voltage                              Output Voltage

a. LM7915                                    -18 V                                  -15.1 V

b. LM7815                                    18 V                                    14.86 V

c. LM317                                      18 V                                    17 V      

Attachment 2: Output Voltage noise of regulator circuit

The noise observed using SR785 at the output of each regulator.

 

Attachment 1: regulator.pdf  225 kB  Uploaded Mon Aug 12 13:55:37 2019  | Hide | Hide all
regulator.pdf
Attachment 2: Noise_across_Voltage_Regulator_Circuit.pdf  122 kB  Uploaded Mon Aug 12 13:56:30 2019  | Hide | Hide all
Noise_across_Voltage_Regulator_Circuit.pdf
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