What are the application of Colpitts oscillator?

It is used for generation of sinusoidal output signals with very high frequencies. The Colpitts oscillator using SAW device can be used as the different type of sensors such as temperature sensor. As the device used in this circuit is highly sensitive to perturbations, it senses directly from its surface.

What is Colpitts oscillator circuit?

The Colpitts Oscillator. The Colpitts Oscillator design uses two centre-tapped capacitors in series with a parallel inductor to form its resonance tank circuit producing sinusoidal oscillations. In many ways, the Colpitts oscillator is the exact opposite of the Hartley Oscillator we looked at in the previous tutorial.

What is the formula for Colpitts oscillator?

The frequency of the oscillator can be from around 500 KHz to 2 MHz depending on the values chosen for C1, C2 and L1. Start with L1 = 100 uH and C1 = 4.7 nF and C2 = 1 nF. This oscillator circuit can produce a sine wave output in excess of 10 Vpp at an approximate frequency set by the value chosen for L1.

What is the other name of Colpitts oscillator?

A Colpitts oscillator, invented in 1920 by American engineer Edwin H. Colpitts, is a device that generates oscillatory output (sinusoidal). It consists of an amplifier linked to an oscillatory circuit, also called LC circuit or tank circuit.

What are the disadvantages of Colpitts oscillator?

Disadvantages :

• Because of inductor L circuit becomes bulky and cost of circuit is more.
• Poor frequency stability.
• Difficult to adjust feedback as capacitor values has to be changed.
• Poor Isolation (Load impedance v/s frequency).
• Hard to design.

Why do we use oscillator?

Oscillators convert direct current (DC) from a power supply to an alternating current (AC) signal. They are widely used in many electronic devices ranging from simplest clock generators to digital instruments (like calculators) and complex computers and peripherals etc.

What is the frequency of Colpitts oscillator?

Typically, the operating frequency of the Colpitts oscillators ranges from 20 kHz to 300 MHz. However, they can even be used for microwave applications as their capacitors provide a low reactance path for high-frequency signals. This results in better frequency stability as well as a better sinusoidal output waveform.

Which oscillator is used for low frequency?

A low-frequency oscillator (LFO) is an electronic oscillator that generates a frequency below approximately 20 Hz. This term is typically used in the field of audio synthesizers, to distinguish it from an audio frequency oscillator….Negative-resistance oscillator.

What are Barkhausen conditions for oscillation?

The Barkhausen criterion states that: The loop gain is equal to unity in absolute magnitude, that is, | β A | = 1 and Page 2 • The phase shift around the loop is zero or an integer multiple of 2π radian (180°) i.e.

Which is better Hartley or Colpitts oscillator?

In Colpitts oscillator, the capacitive voltage divider setup in the tank circuit works as the feed back source and this arrangement gives better frequency stability when compared to the Hartley oscillator which uses an inductive voltage divider setup for feedback.

What is the principle of oscillator?

There are many types of electronic oscillators, but they all operate according to the same basic principle: an oscillator always employs a sensitive amplifier whose output is fed back to the input in phase. Thus, the signal regenerates and sustains itself. This is known as positive feedback.

What is oscillator and its applications?

Used in various radio, TV, and other communication devices. Used in computers, metal detectors, stun guns, inverters, ultrasonic and radio frequency applications. Used to generate clock pulses for microprocessors and micro-controllers. Used in alarms and buzzes.

How does the Colpitts oscillator circuit diagram work?

Colpitts Oscillator Working. Whenever power supply is switched on, the capacitors C1 and C2 shown in the above circuit start charging and after the capacitors get fully charged, the capacitors starts discharging through the inductor L1 in the circuit causing damped harmonic oscillations in the tank circuit.

How is op amp used in Colpitts tank circuit?

Colpitts Oscillator using Op-amp In this type of circuit the op-amp is used in amplifier stage instead of transistor. The tank circuit remains the same as above discussed circuit. Thus the op-amp provides the basic amplification needed while the feedback network is responsible for setting the oscillator frequency.

When did Edwin Colpitts invent the tank oscillator?

Edwin Colpitts invented this Colpitts oscillator in 1918. This oscillator forms a tank circuit by using two center-tapped capacitors in series with a parallel inductor and produces sinusoidal oscillations. The frequency of oscillations can be obtained by taking the values of the capacitors and inductors into consideration.

How is the frequency of the tank oscillator determined?

The tank circuit produces 180° phase shift and the transistor itself produces another 180° phase shift. That means the input and output are in phase and it is a necessary condition of positive feedback for maintaining sustained oscillations. The frequency of oscillations of the Colpitts oscillator can be determined using the equation below.