Phase Shift Oscillator Question

In summary, a phase shift oscillator can be built by connecting an amplifier through a feedback network that shifts the input by 180 degrees. It is possible to use a BJT transistor or a MOSFET amplifier for this, as long as the amplifier has some voltage gain. However, the circuit can be tricky to get going and requires a gain of at least 27. A high gain transistor is recommended and the components should be followed exactly for optimal performance. A helpful resource for designing a BJT phase shift oscillator is the website http://home.earthlink.net/%7Edoncox/wec/Oscillators.html.
  • #1
Garengineer
4
0
Hello everyone. I understand that a phase shift oscillator works by connecting an amplifier through a feedback network that shifts the input by 180 degrees. Although I remembered building a phase shift oscillator in my circuits class using an omp amp, I would like to build one using a bjt transistor or a mosfet amplifier. Will any transistor amplifier work with a phase shift oscillator, or do you have to use a certain amplifier?
 
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  • #2
You can make a phase shift oscillator using one transistor and a few components.

Basic-Phase-Shift-Oscillator-1KHz.gif


Ignore the opamp circuit.
 
  • #3
vk6kro said:
You can make a phase shift oscillator using one transistor and a few components.

Basic-Phase-Shift-Oscillator-1KHz.gif


Ignore the opamp circuit.

So it does not matter which type of transistor amplifier it is for the phase shift network as long as it has some voltage gain?
 
  • #4
No, these are quite tricky to get going. I recall you need a gain of 27 minimum for the circuit to oscillate.

So, the transistor needs to be a high gain type and you should follow the components described exactly.
 
  • #5

What is a Phase Shift Oscillator?

A Phase Shift Oscillator is an electronic circuit that generates a sinusoidal output signal without using an external input signal. It consists of an amplifier and a feedback network that provides the necessary phase shift for oscillation to occur.

How does a Phase Shift Oscillator work?

A Phase Shift Oscillator works by using the feedback network to create a positive feedback loop. The amplifier amplifies the input signal and feeds it back to the feedback network, which then provides the necessary phase shift for the signal to oscillate and produce a stable output.

What are the types of Phase Shift Oscillators?

The three main types of Phase Shift Oscillators are the RC Phase Shift Oscillator, the LC Phase Shift Oscillator, and the Op-Amp Phase Shift Oscillator. Each type uses a different combination of resistors, capacitors, and inductors in its feedback network.

What are the applications of Phase Shift Oscillators?

Phase Shift Oscillators are commonly used in electronic devices to generate a stable frequency signal for various applications such as clock signals, radio frequency signals, and audio signals. They are also used in electronic testing and measurement equipment.

How can I design a Phase Shift Oscillator?

To design a Phase Shift Oscillator, you will need to determine the desired frequency, choose the appropriate type of oscillator, and calculate the values of the components in the feedback network. You can also use online tools and software programs to aid in the design process. It is important to test and adjust the circuit to ensure stable oscillation and desired output.

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