A positive-voltage-supply ecl logic gate is shown in figure

Question

A positive-voltage-supply ECL logic gate is shown in Figure. Neglect base currents.

(a) What logic function is performed by this circuit.

(b) What are the logic 1 and logic 0 values of v₂ at the output?

(c) When v₁ = logic 0 for one of the three inputs, determine i_E1, i_E2, i_c3, i_c2 and v₂.

(d) Repeat part (c) when v₁ = logic 1 for all three inputs.