# What is the formula for bandwidth of FM?

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As a rule of thumb, often termed as Carson’s Rule, 98% of the signal power in FM is contained within a bandwidth equal to the deviation frequency, plus the modulation frequency-doubled. Carson’s rule: Bandwidth of FM BWFM = 2 [ Δf + fm ].

## What is Carson’s rule for FM bandwidth?

In telecommunication, Carson’s bandwidth rule defines the approximate bandwidth requirements of communications system components for a carrier signal that is frequency modulated by a continuous or broad spectrum of frequencies rather than a single frequency.

## What is Carson’s rule formula?

Note 1: The Carson bandwidth rule is expressed by the relation CBR = 2( f + f m) where CBR is the bandwidth requirement, f is the carrier peak deviation frequency, and f m is the highest modulating frequency.

## What is the difference between FM and PM?

In FM, the frequency derivation is proportional to the modulating voltage only. In PM, the frequency derivation is proportional to the modulating voltage as well as modulating frequency. … Amplitude of FM wave is constant. Amplitude of PM wave is also constant.

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