Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronic 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

The Howland Current Pump with balanced-bridge resisters

joniengr

Full Member level 5
Joined
Nov 3, 2018
Messages
244
Helped
1
Reputation
2
Reaction score
1
Trophy points
18
Activity points
2,153
Hi, I have found this article that describes how to get current source with Op-Amp.


If I chose R1 = R2 = R3 = R4 = 3.3 K Ohm and input voltage Vi = 3.3 V then theoretically I will get 1 mA current across the connected load. How much precise this current source ? Would it worth if I use this 1 mA current to setup PT1000 temperature sensor application ?
 

danadakk

Advanced Member level 2
Joined
Mar 26, 2018
Messages
603
Helped
124
Reputation
247
Reaction score
128
Trophy points
43
Activity points
2,922
You have to do an error analysis to answer your question.

- R accuracy
- OpAmp Vos, Aol, PSRR, Noise
- Temperature effects

Best way is to do this, followed by sensitivity analysis to focus
attention to biggest errors first.

https://www.ti.com/lit/ml/sprp524/sprp524.pdf (This focuses on filter, but same principles
apply to DC analysis).


Regards, Dana.
 

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top