IGNOU BPHET 143 2026 - raw the circuit of a Colpitts oscillator. Calculate its frequency of o

Question

raw the circuit of a Colpitts oscillator. Calculate its frequency of oscillation if value of both the capacitors is $5 \text{ nF}$ and inductor is $5 \text{ mH}$ .

19 Jan 2026

Answer :

Word Count : 282

A Colpitts oscillator is a type of LC oscillator used to generate sinusoidal signals in analog circuits. Its basic circuit consists of a transistor (BJT or FET) for amplification, an inductor (L), and two capacitors (C_1) and (C_2) forming a capacitive voltage divider in the feedback network. The junction of the two capacitors is connected to the transistor’s input (base or gate), while the inductor is connected in series with the capacitors to complete the LC tank circuit. The oscillator produces a continuous sinusoidal output due to positive feedback, where a portion of the output signal

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