(a) A shunt feedback amplifier is shown in Fig 11 55 Using equivalent input noise generators for the device, calculate the spot noise figure of this circuit in decibels for R S 10 k Icirc copy using the following data I C 0 5 mA Icirc sup2 50 r b 100 Icirc copy Neglect flicker noise and capacitive effects (b) If the device has f T 500 MHz, calculate the frequency where the noise figure is 3 dB above its low frequency value Fig 11 55 10 k2 Vo 10 k2 Rs

Question: (a) A shunt-feedback amplifier is shown in Fig. 11.55. Using equivalent input noise generators for the device, calculate the spot noise figure of this circuit

(a) A shunt-feedback amplifier is shown in Fig. 11.55. Using equivalent input noise generators for the device, calculate the spot noise figure of this circuit in decibels for R_S= 10 kÎ© using the following data. I_C= 0.5 mA Î² = 50 r_b= 100 Î© Neglect flicker noise and capacitive effects.

(b) If the device has f_T = 500 MHz, calculate the frequency where the noise figure is 3 dB above its low-frequency value.

Fig. 11.55:

10 k2 Vo 10 k2 Rs

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