Practice Math model, Block Diag & SF Graph - GATE & ESE

Math model, Block Diag & SF Graph

Figure shows a phase lead network. For this given network, the maximum phase lead $\phi_m$ will be given as:-

$\tan ^{-1}\left(\frac{R_1}{2 R_2 C_1}\right)$

$\tan ^{-1}\left(\frac{R_1}{R_1+2 R_2}\right)$

$\cos ^{-1}\left(\frac{R_1}{2 R_2 C_2}\right)$

$\sin ^{-1}\left(\frac{R_1}{R_1+2 R_2}\right)$