Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Calculate PSRR of bandgap voltege reference by hspice

Status
Not open for further replies.
P

paramis

Member level 2
Joined
May 28, 2012
Messages
43
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,286
Activity points
1,571
hi
could anyone tell me how calculate PSRR of the voltage reference in dB at ac analyse by hspice?

bandgap.png

i want to get this result by hspice ?
result.png
 
Last edited:

To do that, can you show expression to calculate Vref?
 

paramis said:
... how calculate PSRR of the voltage reference in dB at ac analyse by hspice?
Click to expand...

Insert a sine wave interference source of - say - vis=100mV in series with your VDD supply and run an ac analysis. Then display vref/vis in dB units (vref is the ac part of vis passing through to the node Vref).
 

excuse me
can u write the command? i do not understand your means?
I use this command in hspice:
vdd vdd 0 dc=1.5 ac=1
.ac dec 10 1 20x
.probe ac vdb(vref)

but i cant get that result.
 

I think you miss
Code: 
.OPTION POST
see here: View attachment OPTION_POST_p368_412.pdf

Depending on your wave tool, may be for plotting you need
Code: 
[B].plot[/B] ac vdb(vref)

To get the same frequency range as in your above shown plot, you'd change the .ac command to
Code: 
.ac dec 100 100 10x
 

tnx alot
i get this result and it is not same fig4.(it is my problem)
re.png
 

You'd better use also a logarithmic presentation of the frequency (x-axis).
 
Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top