Bubba Oscillator

One example of the  phase shift oscillator is Bubba oscillator. This oscillator gets 45 degree phase shift for each section from quad op-amp package. The result is excellent d(phase)/d(t) to obtain very low frequency drift. The circuit is shown below:

bubba oscillator schematic circuit schematic diagram

45 degree phase shift is obtained from Each RC section. The alternating section generate a low impedance quadrature output. The differences of each of the op amp output is 45 degrees. This circuit has a frequency about 1.76kHz. RF and RG sets the gain and must be  slightly higher than 4. The lowest distortion  output is given by the junction between R and RG.  If we need very low distortion on all outputs, then the gain should be distributed equally on all op-amps. [Schematic diagram source:  Texas Instrument Analog Applications Journal]

This entry was posted in Oscillators and tagged . Bookmark the permalink.,
Possibly Related to "Bubba Oscillator" Circuits

  • Quadrature Sinewave Oscillator
    Quadrature oscillator is another type of phase shift oscillator. This circuit produce two sine wave signal. One of them is shifted 90 degree from the other signal. The output that shifted 90 degree is called cosine signal and the other … Continue reading →...
  • Basic Phase Shift Oscillator 1KHz
    Phase shift oscillators uses capacitors to shift the phase of a signal coming from the output of an amplifier. If the phase shifting match the frequency, then a positive feedback will be produced a continuous sine waveform. Here is the … Continue reading →...
  • Sine Wave Oscillator
    This is a Sine Wave Oscillator circuit. This circuit as known as  amplitude-stabilized sine-wave oscillator. It can gives high purity sine-wave output down to low frequencies with minimum circuit complexity. This circuit has a several advantages such as it does … Continue reading →...
  • Oscillator With Quadrature Output Using 567 IC
    Oscillator circuit is an electronic circuit that produce a periodic signal. The term quadrature refers to a fourth (1/4) phase shift of full wave cycle (1/4 of 360′ = 90′). In square wave oscillator, a quadrature simply means a 1/4 … Continue reading →...
  • PLL Oscillator for Medium Wave Frequency
    What is a PLL oscillator? PLL stands for phase locked loop, and this means a control method by comparation of the controlled plant or system to a reference clock or oscillator, that the plant is controlled to synchronize the clock. … Continue reading →...

Comments are closed.