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.

Resistor values for getting a gain of 10.86

Status
Not open for further replies.

Kick

Full Member level 6
Full Member level 6
Joined
Sep 27, 2010
Messages
345
Helped
16
Reputation
32
Reaction score
15
Trophy points
1,298
Location
India,Bangalore
Activity points
3,178
Hii all,

I am just stuck with a problem. Here using a instrumentation circuit(see image). I want to know the exact value of resistors for a gain of 10.86. I have calculated and found values (25K and 5.1K),but I am not sure whether it is right value or not?
 

Attachments

  • instr.amp.png
    instr.amp.png
    56.6 KB · Views: 111

Hi,

your given formula is OK for DC gain.

With 25k and 5k1 you get a gain of 10.804.

Klaus
 

Thanks for your reply. But my doubt is in the ref.design they have used 2 resistors in series instead of one(Rg). What is the idea behind that? could you please give me some brief explanation. Thanks.
 

Hi,

the two resistors (we don´t see here) are only for showing the operation as two (like independent working) non inverting OPAMP input stages.
Technically it has no meaning.

Klaus
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top