Question

Notify Me Bookmark

Problem 3 - A CB amplifier circuit is shown with β = 100, rπ = 2.5 KOhms, RS = 75 Ohms, RC = 10 KOhms, and r0 very large. A) For RB = 0 find Rin, Av = vo/vs, and Rout. B) Repeat Part A for RB = 20 KOhms.

Problem 3 - A CB amplifier circuit is shown with β = 100, rπ = 2.5 KOhms, RS = 75 Ohms, RC = 10 KOhms, and r0 very large. A) For RB = 0 find Rin, Av = vo/vs, and Rout. B) Repeat Part A for RB = 20 KOhms.

Image text
Problem 3 - A CB amplifier circuit is shown with β = 100 , r π = 2.5 K O h m s , R S = 75 Ohms, R C = 10 K O h m s , and r 0 very large. A) For R B = 0 find R in , A v = v 0 / v s , and R out . B) Repeat Part A for R B = 20 KOhms.

Detailed Answer

0 0

Please enter your email here. You will get email when this question is answered by our tutor.

Doubtrix Logo

Problem is not yet solved!

Click on Notify me to get email when question is answered.

Join Doubtrix with 7-days free trial

  • Icon Correct & Verified Answers
  • Icon No AI-Generated Answers
  • Icon Video Solution for Difficult Questions
  • Icon Work With Experts to Reach at Correct Answers
Notify me Login Sign Up

Similar/Related Questions

For the circuit shown in Figure. 5, consider the circuit parameters as VCC = VEE = 3.3 V, RS = 500 kΩ, RL = 6 kΩ, RB = 100 kΩ, RE = 12 kΩ, and RC = 12 kΩ. The transistor parameters are: β = 120, VBE(on) = 0.7 V, and VA = ∞. (a) Calculate the Q-point values (ICQ, VCEQ) using DC analysis, (b) Determine the small-signal hybrid−π parameters (rπ, gm, ro), (c) Find the small-signal voltage gain Av = vo/vs, (d) Find the small-signal current gain Ai = io/ii, (e) Determine the input resistance Ri and output resistance Ro. [30 Marks] Figure. 5
Solution
0 0

Problem 4 - The circuit shown is a cascod MOS amplifier. The transistors are identical with gm = 2.5 mA/V, I = 200 μA, and VA = 4 V. A) Find the output impedance of the amplifier, Rout. B) Find the amplifier voltage gain Av = Vo/vi. C ) For Vtn = 0.4 V and Vov = 0.2 V find the DC voltages V1 and the lowest DC output voltage Vo, where all the transistors stay in the saturated region.

Solution
0 0

Question: For the AC equivalent circuit of a common-emitter BJT amplifier shown in Figure 1, assume that VCC = 10 V, VBE = 0.7 V, RS = 5 kΩ, RB = 100 kΩ, RL = 1 kΩ, Cb'e = 2 pF, Ccb′ = 1 pF, and CL = 1 pF. Assume bias current IB = 25 μA, Boltzmann's constant k = 1.38×10−23 J/K, q = 1.6 ×10−19 C, T = 300 K, VT = 26 mV, β = 100, rbb' = 100 Ω, and ignore ro. Assuming the equivalent noise bandwidth is 100 kHz, and neglecting the flicker noise and capacitive effect. Note: For the BJT biased on the forward active region: rπ = VT/IB, gm = IC/VT. (a) Calculate the total equivalent input rms noise voltage and current by looking into node a. (b) Calculate the total equivalent input rms noise voltage and current by looking into node b. (c) Discuss if a transformer (with turn ratio I:N) can be incorporated into point b to minimize the total input referred noise? If yes, what is the N to be? Figure 1
Solution
0 0