What is resonance frequency of LC circuit?
Resonance occurs when an LC circuit is driven from an external source at an angular frequency ω0 at which the inductive and capacitive reactances are equal in magnitude. The frequency at which this equality holds for the particular circuit is called the resonant frequency.
How does an LC tank circuit work?
The oscillatory circuit, also called the L-C circuit or tank circuit, consists of an inductive coil of inductance L connected in parallel with a capacitor of capacitance C. The values of L and C determines the frequency of oscillations produced by the circuit. Thus, a potential energy will be formed in the capacitor.
What is the condition for oscillator?
Oscillator circuit must satisfy the following two conditions known as Barkhausen conditions: 1. The first condition is that the magnitude of the loop gain (Aβ) must be unity. This means the product of gain of amplifier ‘A’ and the gain of feedback network ‘β’ has to be unity.
What is difference between Hartley and Colpitts oscillator?
The frequency of the oscillations are determined by the value of the capacitors and inductor in the tank circuit. Thus the main difference between a Colpitts Oscillator and a Hartley Oscillator is that the former uses tapped capacitance, while the latter uses tapped inductance.
Which oscillator is more stable and why?
Oscillators based on a resonator like a quartz crystal are generally easily stabilized because the mechanical resonance of the quartz element is highly stable, only influenced to a small degree by external factors.
How do you control the frequency of a Hartley oscillator?
The frequency of oscillations can be adjusted by varying the “tuning” capacitor, C or by varying the position of the iron-dust core inside the coil (inductive tuning) giving an output over a wide range of frequencies making it very easy to tune.
What are the disadvantages of Hartley oscillator?
Disadvantages. It cannot be used as a low-frequency oscillator since the value of inductors becomes large and the size of the inductors becomes large. The harmonic content in the output of this oscillator is very high and hence it is not suitable for the applications which require a pure sine wave.
Why Hartley oscillator is used?
Hartley Oscillator 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. The function of tank circuit is to tune a certain frequency. LC oscillators are designed to operate in the radio-frequency range.
What is the frequency of Hartley oscillator?
Hartley oscillators are commonly used in radio frequency (RF) oscillator applications and the recommended frequency range is from 20KHz to 30MHz. Hartley oscillators can be operated at frequencies lower than 20KHz, but for lower frequencies the inductor value need to be high and it has a practical limit.
Which oscillator is used for high frequency?
The LC Oscillator is therefore a “Sinusoidal Oscillator” or a “Harmonic Oscillator” as it is more commonly called. LC oscillators can generate high frequency sine waves for use in radio frequency (RF) type applications with the transistor amplifier being of a Bipolar Transistor or FET.
Which oscillator is more accurate?
9. In the following oscillator which one is more accurate? Explanation: The stray third capacitor in the clap oscillator doesn’t have a negative effect and the frequency obtained is instead more stable and accurate than colpitt oscillator.
Which oscillator gives stable output?
RC Oscillators