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Old 15th August 2002, 09:35 PM   #11
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From experience, I can tell you that you get the most
PSRR for the buck with very careful attention to the
quality of constant current sources that you might
employ, particularly in creating voltage references for them.
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Old 15th August 2002, 10:01 PM   #12
ALW is offline ALW  United Kingdom
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Default CCS

Nelson,

Thank you for that pointer, something I shall pay some extra attention to in the design. I'm looking forward to this actually should an interestign challenge.

regards,

Andy.
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Old 15th August 2002, 10:30 PM   #13
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Default Simulating PSSR

Hi all

Could one simulate the PSSR in an amp by using a sine generator in series vith each of the rails amd the do a FFT on the output ?

Is P - Spice' FFT any good ?

\Jens
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Old 15th August 2002, 10:31 PM   #14
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Default UPS PSRR

sorry

PSRR
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Old 18th August 2002, 08:43 PM   #15
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Default SPICY PSRR

Jens,

PSRR can most definitely be simulated in SPICE - it's easy to add modulation to a DC source and see the result.

This is, in fact, what I'm currently doing in the design phase.

It's easier than actually measuring it - you require some serious amp performance to swing AC over a wide bandwidth into lots of capacitance and maintain stability.

A.
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Old 15th June 2004, 07:09 PM   #16
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Default Re: Simulating PSSR

Quote:
Originally posted by JensRasmussen
Hi all

Could one simulate the PSSR in an amp by using a sine generator in series vith each of the rails ......
\Jens

stick AC source in series with +DC supply, aC ground input, and run aC analysis.....repeat for -DC rail....
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Old 16th June 2004, 08:57 AM   #17
wenye is offline wenye  China
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ALW,

Have you try cascode topology in CCS? It can improve the output impedance and frequency response a lot...


Wenyeh
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Old 16th June 2004, 10:55 AM   #18
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Default sidestepping the issue somewhat

Using a seperate rectifier and capacitors for the low current
stages and only using the main capacitors for the output stage.

sreten.
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Old 16th June 2004, 11:09 AM   #19
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ALW started this thread in 2002 so the whole issue may be irrelevant for him....
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Old 16th June 2004, 07:00 PM   #20
mikeks is offline mikeks  United Kingdom
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Default Re: sidestepping the issue somewhat

Quote:
Originally posted by sreten
Using a seperate rectifier and capacitors for the low current
stages and only using the main capacitors for the output stage.

sreten.

Good idea!
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