IGNOU BPHET 143 2026 - Why LC oscillators are preferred over RC oscillators to generate high

Question

Why LC oscillators are preferred over RC oscillators to generate high frequencies? Why 2-stage amplifier is required in Wien bridge oscillator in contrast to a single stage amplifier in the phase shift oscillator?

19 Jan 2026

Answer :

Word Count : 272

LC oscillators are preferred over RC oscillators for generating high frequencies primarily due to their superior frequency stability and low energy loss at high frequencies. In an LC oscillator, the frequency of oscillation is determined by the inductance (L) and capacitance (C) in the tank circuit, given by ( f = \frac{1}{2\pi\sqrt{LC}} ). At high frequencies, RC circuits suffer from increased phase shift errors, parasitic capacitances, and higher attenuation, which make them impractical. LC circuits, on the other hand, can sustain oscillations efficiently because

____ ___ ___ _______ __________ _____ _______ ______ _________.
______ ________ _______ ___ ________ __________ _________.
________ __________ _______ _______ ________ ________ ______ ___ ____.
________ ___ ___ ________ ______ __________ _______ ____ __________ _______ ___.
______ _________ _____ ____ _____ ____ _______.
______ _______ ______ ___ _________ _________ _________ __________.
_____ ___ _____ _________ ___ ____.
_____ __________ ____ _____ _________ ________ ____ ____ __________.
________ ___ ____ _______ _____ __________.
_________ ______ _________ _______ __________ ____ _______ ___ _______ _______ __________ _____.
__________ ______ ________ __________ ________ ____ _____ _______ ________ _______ ________ __________.
___ ____ _____ ___ _______ _____ ______ ___ ________ __________ __________ __________.
_____ _____ ____ ___ _______ ___ ________ _________ _____ _______ ___ _________.
_____ __________ _______ _________ _______ _____ ______ ____ _____ _____ __________ ________.
_____ ___ _____ ___ ________ ____ ___ _________ _____ ___ ________.
____ ______ _____ ___ _________ _______ _______ ______ __________ _____ __________.
__________ ____ ____ _________ ________ _______ _______ ___ __________ _______ ___ _______.
_____ _______ ___ _____ ____ _________ ____ ____ _______ _____ ________ ________.
_________ _____ _______ _____ _________ _______.
___ __________ ________ ____.

IGNOU ACADEMY

Your IGNOU journey, made easier.

Solved Assignments
Study Notes
Guess Papers
Question Papers

Call Us WhatsApp

STUDY • PREPARE • SUCCEED

Skip in 10

IGNOU Solved Assignments Assignments Ignou Projects Project Previous Year Solved Exam Papers Notes Notes Sample Question Papers Sample Question Papers