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DC Offset

BlackMelon

Aug 7, 2012
188
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Aug 7, 2012
Messages
188
Hello

I have some questions to ask you
1.Can summing amplifier op-amp be used to create a DC offset.
2.What is the best, simplest way to create a DC offset?
I have 5-0 square wave pulse. If I use boost circuit,I might get 10-0 but all I want to do is making 10-5 (just making an offset not pumping its amplitude up)

Thank you
 

john monks

Mar 9, 2012
685
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Mar 9, 2012
Messages
685
1. Yes.
2. Place DC into one input of a summing amplifier.
Do you have a particular circuit in mind?
 

BobK

Jan 5, 2010
7,682
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Jan 5, 2010
Messages
7,682
Yes, using a summing amplifier with gain 1 and put 5V into one input and your signal into the other.

Bob
 

BlackMelon

Aug 7, 2012
188
Joined
Aug 7, 2012
Messages
188
Thank you guys, I just want to do a High-side gate driver to drive N-channel motor H-bridge.
All I need are
1.DC charge pump to pump pulse amplitude up
2.DC offset
3.A current source to inject current to Gate

I'm curious about no.3 too. I've got an advise from my Professor that the gate current is not always zero as an ideal is and it still needs to inject some currents to it until the gate voltage have reached the desired value.
How can I do such a thing? Can I use sth. like Widlar current source and Wilson current mirror?
 
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