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DC Offset

Discussion in 'General Electronics Discussion' started by BlackMelon, Jun 14, 2013.

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  1. BlackMelon

    BlackMelon

    188
    5
    Aug 7, 2012
    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
     
  2. john monks

    john monks

    693
    2
    Mar 9, 2012
    1. Yes.
    2. Place DC into one input of a summing amplifier.
    Do you have a particular circuit in mind?
     
  3. BobK

    BobK

    7,682
    1,688
    Jan 5, 2010
    Yes, using a summing amplifier with gain 1 and put 5V into one input and your signal into the other.

    Bob
     
  4. BlackMelon

    BlackMelon

    188
    5
    Aug 7, 2012
    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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