the following is the circuit of a bubba oscillator sketched by multisim , but I can/t get the expected output. The oscillator only shows a 6V DC .It seems that it cannot oscillate by itself, who can help me ?
You need to cause a deviation from equilibrium to make the circuit oscillate in simulation. A simple method is to skip the initial transient solution. Otherwise inject a small "kick-start" pulse. If the pulse shows an oscillation of decreasing amplitude, increase the loop gain.
You need to cause a deviation from equilibrium to make the circuit oscillate in simulation. A simple method is to skip the initial transient solution. Otherwise inject a small "kick-start" pulse. If the pulse shows an oscillation of decreasing amplitude, increase the loop gain.
This is a two part suggestion. Did you try the first part. (See Multisim manual: Setting Transient Analysis Parameters, Initial conditions: Set to Zero).