Essentials of LC oscillator
Fig shows the block diagram of an oscillator. Its
essential components are (i) tank circuit, (ii) amplifier and (iii) feedback
circuit.
(i) Tank circuit : It consists of
inductance coil (L) connected in parallel with capacitor (C). The
frequency of
oscillations in the circuit depends upon the values of inductance coil and
capacitance of the capacitor.
(ii) Amplifier : The transistor
amplifier receives d.c. power from the battery and changes it into a.c. power
for supplying to the tank circuit.
(iii) Feedback circuit : It provides positive
feedback (i.e.) this circuit transfers a part of output energy to LC circuit in
proper phase, to maintain the oscillations.
LC oscillators
A transistor can work
as an LC oscillator to produce undamped oscillations of any desired frequency,
if tank and feedback circuits are properly connected to it. There are different
LC oscillators used in electronic circuits, of which, the working principle of
Colpitt's oscillator is discussed here.
Colpitt's oscillator
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