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.

[SOLVED] How to convert CMRR in DB to Numerical Value

Status
Not open for further replies.

satiz

Member level 5
Member level 5
Joined
Jun 9, 2013
Messages
87
Helped
3
Reputation
6
Reaction score
3
Trophy points
1,288
Activity points
1,999
My CMRR value is 90dB. Can anyone explain to convert this in numerical value.
 

90 dB = 20 * log(voltage_ratio)
=>
voltage_ratio = 10^(90/20) = 31623

The output will change max 1/31623 of the input common mode change. In this case about 32uV/V


You can also get this directly by going from out/in = -90 dB = 10^(-90/20) = 32u
 

Hi,

What about doing an internet search on your own: "online dB calculator"...

Klaus
 
Online calculator gives me the results. But Mr.std_match explanation is very much useful to understanding better way :)
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top