The Designer's Guide Community
Forum
Welcome, Guest. Please Login or Register. Please follow the Forum guidelines.
May 5th, 2024, 9:38pm
Pages: 1
Send Topic Print
About PSRR (Read 3083 times)
serdes
New Member
*
Offline



Posts: 1

About PSRR
Nov 17th, 2004, 11:41pm
 
Hello everyone
  I have been confusing by the psrr,such as in op or bandgap,ldo. I can`t know how to figure the impact
on my circuit,especially on op.Can you  show me some marterial on it?
 Best regards
Back to top
 
 
View Profile   IP Logged
sheldon
Community Fellow
*****
Offline



Posts: 751

Re: About PSRR
Reply #1 - Dec 10th, 2004, 7:30pm
 
Hi,

  Don't have any material just some comments:

1) Simply put power supply are inputs. PSRR gives the ratio
   of the gain from the power supply to the output over the
   gain from the standard inputs to the output.

2) While PSRR is typically specified as XdB at YHz, you also
    need to consider the dc levels of the  inputs, the
    output, and the power supply. All of the dc levels and
    can effect the ac results.

3) Depending on the circuit, i.e., differential circuits, there
   may be canceling due to symmetry. In that case, you
   need to analyze the effect of device mismatch on PSRR.

4) Measure the open loop gain, and then move  ac
   input to the power supply terminal and then take the
   ratio., the ADE calculator is good for this type of
   calculation.

                                                      Sheldon
Back to top
 
 
View Profile   IP Logged
Pages: 1
Send Topic Print
Copyright 2002-2024 Designer’s Guide Consulting, Inc. Designer’s Guide® is a registered trademark of Designer’s Guide Consulting, Inc. All rights reserved. Send comments or questions to editor@designers-guide.org. Consider submitting a paper or model.