Why do we need oscillator circuit?
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 use of tank circuit in oscillator?
LC oscillator is a type of oscillator where a LC (inductor-capacitor) tank circuit is used for giving the required positive feedback for sustaining the oscillations. The LC tank circuit is also termed as LC resonant circuit or LC tuned circuit.
Why are tank circuits used?
Applications of Tank Circuit These circuits are used for tuning transmitters & receivers of radio. Once these circuits get charge then generate a precise frequency. For example, once you turn on a radio toward a particular station, the charge can be changed on a circuit then it vibrates at that frequency.
What are the main uses of an oscillator?
Some common applications of oscillators include: Quartz watches (which uses a crystal oscillator) Used in various audio systems and video systems 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
What are conditions for an oscillator to oscillate?
Regardless of its amplifier, an oscillator must meet the two Barkhousen conditions for oscillation: 1 – The loop gain must be slightly greater than unity. 2 – The loop phase shift must be 0° or 360°.
How does an oscillator oscillate?
The oscillator starts generating oscillations by amplifying the noise voltage which is always present. This noise voltage is result of the movement of free electrons under the influence of room temperature. This noise voltage is not exactly in sinusoidal due to saturation conditions of practical circuit.
How does a transistor act as an oscillator?
A transistor can be operated as an oscillator for producing continuous undamped oscillations of any desired frequency if tank (or oscillatory) and feedback circuits are property connected to it. All oscillators under different names have similar function i.e. they generate continuous undamped output.