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PSoC 5, 3 & 1 MCU

Anonymous
Not applicable

Hi everyone,

   

Good day !

   

I want some information about when the Opamp is configured as a follower.

   

Thanks and regards.

   

maxdamage

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11 Replies
Esteemed Contributor II

Well, at what information do you need?

   

 

   

Bob

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Anonymous
Not applicable

Everything you have .

   

maxdamage.

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Esteemed Contributor II

What in the datasheet are you missing? There is a chapter for electrical specs. If a parameter is not in the datasheet you might file a technical "MyCase" to get it answered by Cypress directly.

   

Or

   

What do you want to perform with a PSoC3 opamp?

   

 

   

Bob

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Honored Contributor II

You can also look into the Family data sheet for the device you are using, its has all the electrical specs.

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Anonymous
Not applicable

The datasheet does not contain enough information about the follower. I've reviewed a project that include it and i want to know what is it's purpose.

   

thanks for help.

   

maxdamage.

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Esteemed Contributor

The general purpose of a follower is to translate a high Z domain to

   

a low Z. That is to take a signal that presents itself with a high source

   

impedance and without loading that signal translate it such that you can

   

drive other signal chains with the signal, essentially presenting a voltage

   

(low Z) source for the other signal chains being driven.

   

 

   

Also the voltage follower presents essentially the widest small signal bandwith

   

for an OpAmp configuration. As well commonly used to drive C loads, although

   

they must be designed for that purpose, re compensation.

   

 

   

    

   

          http://www.edn.com/electronics-blogs/analog-bytes/4426049/Inverting-vs--Noninverting-

   

 

   

Regards, Dana.

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Anonymous
Not applicable

Thanks to you all.

   

Dana the link that you put in your reply is not working with me and i didn't understand a word about what you've written so if it is a link that contain simple information or document please attach it here.

   

Thanks and regards

   

maxdamage

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Esteemed Contributor

Here is a book on OpAmps and basic circuit theory, attached.

   

 

   

Regards, Dana.

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Esteemed Contributor II

In simple words:

   

A "Follower" is an amplifier with a gain of 1.0. So a source that may deliver a voltage at rather low current can be amplified to deliver the same voltage but at higher currents.

   

 

   

Bob

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Esteemed Contributor

A follower can also have a gain = -1. But if you read the

   

book the abs( DC gain) (configured in a feedback loop) is,

   

for real OpAmps, always < 1.0000000000000000000000000000000000........

   

because of finite open loop G effects.

   

 

   

Also not all followers can delivery more current, the classic

   

Common Emitter / Common Drain when designed for low power

   

for example.

   

 

   

Regards, Dana.

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Anonymous
Not applicable

 Take two stages of non inverting buffer opamp in cascade. or just connecting the in to out in the opamp and apply input

   

this is required to match impedance and avoid loading as it offer very high Zin and very low Zout.

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