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UGC NET Paper 2 (Electronic Science) December 2019 Official Paper

Option 1 : 74 dB

Official Paper 1: Held on 24 Sep 2020 Shift 1

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__Concept__**:**

The dynamic range is the ratio between the highest and the lowest-power signal simultaneously present at the input, where both of these signals appear in the display.

TOI (Third-Order Intercept) point is a parameter used to evaluate the linearity of components that are utilized in applications where nonlinear effects can cause distortion—for example, in digitally modulated signals.

The two equations given below are used to calculate the intermodulation free dynamic range:

For 2^{nd} Order Intercept, the dynamic range in dB is given by:

\(D{R_2} = \frac{1}{2}\left( {I{P_2} - NL} \right)\)

IP_{2} = Second-Order intercept point

NL = Noise Level

For 3^{rd} Order Intercept, the dynamic range in dB is given by:

\(D{R_3} = \frac{2}{3}\left( {I{P_3} - NL} \right)\)

__Calculation__**:**

Given IP_{3} = + 26dBm

NL = - 85 dBm

The Dynamic Range for the given third-order intercept will be:

\(D{R_3} = \frac{2}{3}\left( {26 - \left( { - 85} \right)} \right)dB\)

\(D{R_3} = \frac{2}{3}\left( {111} \right) = 74\;dB\)