Designing for PSRR - Page 2

Nelson Pass · 15th August 2002, 09:35 PM

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.

ALW · 15th August 2002, 10:01 PM

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.

JensRasmussen · 15th August 2002, 10:30 PM

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

JensRasmussen · 15th August 2002, 10:31 PM

sorry

PSRR

ALW · 18th August 2002, 08:43 PM

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.

mikeks · 15th June 2004, 07:09 PM

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....

wenye · 16th June 2004, 08:57 AM

ALW,

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

Wenyeh

sreten · 16th June 2004, 10:55 AM

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

sreten.

peranders · 16th June 2004, 11:09 AM

ALW started this thread in 2002 so the whole issue may be irrelevant for him....

mikeks · 16th June 2004, 07:00 PM

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!

15th August 2002, 10:01 PM	#12
ALW diyAudio Member Join Date: Jun 2001 Location: UK	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.

15th August 2002, 10:30 PM	#13
JensRasmussen diyAudio Member Join Date: Jul 2002 Location: Denmark - Jutland	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

15th August 2002, 10:31 PM	#14
JensRasmussen diyAudio Member Join Date: Jul 2002 Location: Denmark - Jutland	UPS PSRR sorry PSRR

18th August 2002, 08:43 PM	#15
ALW diyAudio Member Join Date: Jun 2001 Location: UK	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.

16th June 2004, 10:55 AM	#18
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	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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15th August 2002, 09:35 PM	#11
Nelson Pass The one and only Join Date: Mar 2001	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.

16th June 2004, 08:57 AM	#17
wenye diyAudio Member Join Date: Jan 2004 Location: GZ. GD.	ALW, Have you try cascode topology in CCS? It can improve the output impedance and frequency response a lot... Wenyeh

16th June 2004, 11:09 AM	#19
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	ALW started this thread in 2002 so the whole issue may be irrelevant for him.... __________________ /Per-Anders (my first name) or P-A as my friends call me Tube Buffered Gainclone in work \|Thread

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