bubba oscillator

Thread Starter

HelderCC

Joined Feb 12, 2014
3
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.
 

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ericgibbs

Joined Jan 29, 2010
18,766
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
 

Veracohr

Joined Jan 3, 2011
772
hi H,
If the Initial conditions are 'balanced' the sim will not oscillate,
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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