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Voltage Buffer/ Follower without opamp?

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ibnul7

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Hey guys, I was just wondering how i would make a voltage buffer/follower without using an opamp. I have used some class A (emitter follower) and AB amplifiers, but when my output is very low impedance, my output starts to saturate with an offset. I was wondering if you guys had any designs in mind with very high output impedance.

Thanks :)
 

Why would you want a high output impedance? What is your load? Can you give us more specifics about your requirements?
 

ibnul7 said:
Hey guys, I was just wondering how i would make a voltage buffer/follower without using an opamp. I have used some class A (emitter follower) and AB amplifiers, but when my output is very low impedance, my output starts to saturate with an offset. I was wondering if you guys had any designs in mind with very high output impedance.
Thanks :)
Click to expand...

A voltage buffer has the task to provide a voltage with low output resistor and without gain, that means: Av=1.
Thus, it is surprising that you ask for a high output resistance.
 

ibnul7 said:
Hey guys, I was just wondering how i would make a voltage buffer/follower without using an opamp. I have used some class A (emitter follower) and AB amplifiers, but when my output is very low impedance, my output starts to saturate with an offset. I was wondering if you guys had any designs in mind with very high output impedance.

Thanks :)
Click to expand...

A follower(or a buffer) by definition has to have very low output impedance, as it has to drive any load.
If for any reason you need to increase the output impedance, just add a resistor of a desired value, but I’m afraid it will be the end of calling this thing a follower ..
:wink:
IanP
 

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