A circuit is shown below with component values: r pi = 3.3 k ohm , r0 = 5 k ohm

Question

A circuit is shown below with component values: r pi = 3.3 k ohm , r0 = 5 k ohm , RL = 1.1 k ohm , and gm = 50 mA/V. Find the Thevenin equivalent resistance between terminals A and B. Find the Thevenin equivalent resistance between terminals C and D. with short circuit A,B Connect a 1 volt source to terminals A and B with the anode attached to A. Determine the voltage Vout A circuit is shown below with component values: r pi = 3.3 k ohm ,RE = 20 ohm , RL = 1.1 k ohm , and gm = 50 mA/V. Find the Thevenin equivalent resistance between terminals A and B. Find the Thevenin equivalent resistance between terminals C and D. with short circuit A,B Connect a 1 volt source to terminals A and B with the anode attached to A. Determine the voltage Vout A circuit is shown below with component values: r pi = 3.3 k ohm , r0 = 5 k ohm , RE = 20 ohm , RL = 1.1 k ohm , and gm = 50 mA/V. Find the Thevenin equivalent resistance between terminals A and B. Find the Thevenin equivalent resistance between terminals C and D. with short circuit A,B Connect a 1 volt source to terminals A and B with the anode attached to A. Determine the voltage Vout

Explanation / Answer

1) (a) Rin = r = 3.3k

(b) Rout = RL = 1.1k

(c) Vo = -gmRout*Vin = -50 * 1.1*1 = -55V

2) = r*gm = 3.3 * 50 = 165

(a) Rin = r + (1+)Re = 3.3k + 166*20 = 6.62k

(b) Rout = RL || (1+)Re = 1.1k || 166*20 = 826.24

(c) Vo = -50 * 0.826 * 1 = -41.3V

3) (a) Rin = r + (1+)Re = 3.3k + 166*20 = 6.62k

(b) Rout = RL || [ro + (1+)Re] = 1.1k || [5k + 166*20] = 971.55

(c) Vout = -50 * 0.971*1 = -48.55V

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