bubba oscillator

Discussion in 'The Projects Forum' started by HelderCC, Feb 12, 2014.

  1. HelderCC

    Thread Starter New Member

    Feb 12, 2014
    3
    0
    Hi guys,
    I simulated a bubba oscillator, but the circuit output is 6Vdc, it don't oscillate.
    Can you help me?

    Pspice
    frequency = 60hz

    The circuit is attached.
     
  2. t06afre

    AAC Fanatic!

    May 11, 2009
    5,939
    1,222
    Try this free ebook http://www.ti.com.cn/cn/lit/an/slod006b/slod006b.pdf (section 15) If I have to guess you do not have enough gain in your circuit. Try to increase R2. It could also be some errors in your wiring of course. Check and double check everything even the component values
     
  3. ericgibbs

    AAC Fanatic!

    Jan 29, 2010
    2,503
    380
    hi H,
    If the Initial conditions are 'balanced' the sim will not oscillate, have you tried setting .IC= some voltage for an input on the leftmost OPA.? [initial unbalance]

    The .IC= Vx is used in LTSpice, not sure if its the same for Spice.
    E
     
  4. MikeML

    AAC Fanatic!

    Oct 2, 2009
    5,450
    1,066
    Extensive Bubba Oscillator thread with running simulations here.
     
  5. Veracohr

    Well-Known Member

    Jan 3, 2011
    550
    75
    This.
    When I simulate oscillators, I set one of the supplies (assuming a dual supply) to ramp from 0 up to the desired voltage. It creates an initial imbalance that allows the circuit to start doing its thing.
     
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