Rules | Recent posts | topic RSS | Search | Register  | Log in

how to simulate PSRR of bandgap v?ltages.

 
Post new topic  Reply to topic    EDAboard.com Forum Index -> Analog IC Design & Layout
Author Message
triquent



Joined: 13 Oct 2004
Posts: 166


Post13 Jan 2005 4:11   how to simulate PSRR of bandgap v?ltages.

For a bandgap voltage reference(Op-Amp type). how to simulate the PSRR?
I use the following command:
vdd 1 0 dc vd ac 1.0
.ac dec 20 1 1G
.plot vdb(vref)
Is this right? what does dec 20 mean? should I look at vdb(vref) or 'vdb(vdd)-vdb(vref)'?
Back to top
wee_liang



Joined: 04 Jan 2005
Posts: 26


Post13 Jan 2005 17:44   Re: how to simulate PSRR of bandgap v?ltages.

dec 20 refers to simulation of 20 points spread out in each decade, (i.e. not linearly)

vdb(vbg) is good enough 'cos it will show the effect of an ac signal (i.e. noise) with magnitude 1 on the overall output.
Back to top
Post new topic  Reply to topic    EDAboard.com Forum Index -> Analog IC Design & Layout
Page 1 of 1 All times are GMT + 1 Hour


Abuse
Administrator
Moderators
topic RSS 
sitemap