AC + DC bias

Discussion in 'General Electronics Chat' started by dboy23, Feb 14, 2007.

  1. dboy23

    Thread Starter New Member

    Feb 14, 2007
    I have a prob in a tester's AWG (arbitrary waveform generator), the dc offset of the diff output are not good so I put coupling cap on the output of the AWG (to block the dc and pass only the AC signal) and put a resistor connected to an accurate DC source. With this the dc are now accurate but I think the AC signal affects by this RC ckt.
    Do you have any suggestion how can I mix the AC and DC? I need 80Khz, 100mVpp with 1V dc.
  2. beenthere

    Retired Moderator

    Apr 20, 2004
    Use an op amp. Feed the DC to the non-inverting input and the AC to the inverting input.