Bode Plot in Network Analysis:

The Bode Plot in Network Analysis is a popular method to obtain the frequency response of the networks. It basically sketches the variations in M_R and Φ_R against the frequency ω but uses a logarithmic scale for ω, to accommodate large range of frequency within a small distance. Similar to the frequency response, the Bode plot also consists of two plots,

1. Magnitude plot        
2. Phase angle plot

Magnitude Plot:

The scientist Bode suggested to express M_R in decibel (dB) to plot against Log (ω). Such a dB value of M_R can be obtained as,

Such dB values are obtained for various values of ω from 0 to ∞ and are plotted against Log₁₀ ω.

The magnitude plot is shown in the Fig. 4.10 (a).

Phase Angle Plot:

The ∠ H(jω) i.e. Φ_R is obtained in degrees for various values of ω and are plotted against Log₁₀ ω.

The phase angle plot is shown in the Fig. 4.10 (b).