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In Reply to: RE: Are big capacitors required after a B+ regulator? posted by jorisdallaire on August 20, 2014 at 10:54:51
What kind of regulator? What voltage? Some regulators - e.g., gas tube regulators - should not be loaded with more than 1 ufd of capacitance. From your question, you must be referring to a solid state regulator. If its output impedance is only 1 Ohm, you don't need any capacitance beyond what is necessary to prevent the regulator from oscillating.
That said, you need to know the frequency characteristics of the regulator (output impedance versus frequency).
Follow Ups:
Hello,
Yes it is solid state. I have no means of measuring impedance vs frequency, maybe i can have an approximation in spice.
Thanks for you answer.
SPICE is an excellent way to look at output Z over frequency, assuming all the models are available. I've SPICED some of our very low noise regulators where I work, and the results closely agree with measurements.
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Buy Chinese. Bury freedom.
Available free online from Linear Technology Corp. You'll need to invest some time in learning the program, but it's worth the effort. Once the circuit is built, I analyze output Z by attaching a sine generator to the output through a resistor. Attenuation across the resistor is inversely proportional to output Z.
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Buy Chinese. Bury freedom.
Edits: 08/21/14
I am familiar with LTSpice, but still at hobbyist level. I appreciate those analysis tricks.
Regards,
Joris
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