A super-β input stage is shown in Fig. 11.53a.

(a) Neglecting flicker noise and capacitive effects, calculate the equivalent input noise voltage and current generators Ï…₂ and i₂ for this stage. Data: I_EE = 1 µA; β₁ = β₂ = 5000; r_b1 = r_b2 = 500 Ω.

(b) If the circuit is fed from source resistances R_S = 100 MΩ as shown in Fig. 11.53b, calculate the total equivalent input noise voltage at υ_s in a bandwidth of 1 kHz.

Fig. 11.53a:

Fig. 11.53b:

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