Intermodulation Performance For an input vb vb cos omega t

Intermodulation Performance For an input v_b = v_b cos omega t + V_b, cos omega_1 t, what is the magnitude of the output, V_o(2omega -omega_1)at frequency 2omega - omega_1? Note that v^3_b = ... + 3/4V^3_b cos(2omega - omega_1)t +... Express this in terms of the fundamental output V_0(omega) = |a_1 V_b|. What is the OIP3 parameter in terms of the relationship between V_o(2omega-omega_1) and V_o(omega)? Hence what is OIP3 (in terms of V_m)? Hence what is IIP3 (in terms of V_T)? Note that the gain is a_1 What is the output third-order intermodulation level relative to the fundamental. IMD_c = V_0(2omega-omega_1)/V_o(omega). if the output is 10% of the estimated maximum (V_o(omega) = 0.1 V_M)?

Solution

5(a) vb = Vb (coswt + cosw₁ t)/

w is replace by 2w - w1

vb³ = 3/4 Vb³ cos(2w -w1)+................

(b) V = a1*Vb = a1Vb²

^{d) OIP3 =} Vm /2

e) IIP3 = Vt - Vm /2