The ac schematic of an amplifier is shown in Fig 11 49 The circuit is fed from a current source i S and data are as follows R S 1 k brvbar R L 10 k brvbar I C 1 mA Icirc sup2 50 r b 0 r o Neglecting capacitive effects and flicker noise, calculate the total noise voltage spectral density at v o in V...

Using 1138 112 10 12 V 2 HZ If f 2 MHZ 2 ...

The ac schematic of an amplifier is shown in Fig. 11.49. The circuit is fed from a

Question:

The ac schematic of an amplifier is shown in Fig. 11.49. The circuit is fed from a current source i_Sand data are as follows:

R_S =1 k „¦ R_L= 10 k „¦ I_C= 1 mA

Î² = 50 r_b = 0 r_o = ˆž

Neglecting capacitive effects and flicker noise, calculate the total noise voltage spectral density at v_o in V² /Hz. Thus calculate the MDS at i_S if the circuit band-width is limited to a sharp cutoff at 2 MHz. Compare your result with a SPICE simulation. (This will require setting up a bias circuit.)

Figure 11.49

Vo R Rs