The differential amplifier above has the following parameters: βo = 15

Question

Notify Me Bookmark

The differential amplifier above has the following parameters: βo = 150, VCC = 5 V, VEE = 5 V, VBE−on = 0.7 V, REE = 20 kΩ, R1 = 3 kΩ, and RC = 20 kΩ. v1 and v2 are purely AC signals with 0 DC voltage. Determine the following: (a) The DC Q-points for Q1 and Q2. [4 pt. (b) Draw the differential-mode and common-mode AC equivalent half-circuits for the differential amplifier. [ 6 pt. ] (c) What is the differential-mode gain (Add) ? [4 pt. ] (d) What is the common-mode gain (Acm)? [4 pt.] (e) What is the CMRR? [4 pt.] (f) What is the differential-mode input resistance? [4 pt.] (g) What is the common-mode input resistance? [4 pt.]

Image text

The differential amplifier above has the following parameters:

β o = 150, V_{C C} = 5 V, V_{E E} = 5 V, V_{B E - o n} = 0.7 V, R_{E E} = 20 k Ω, R_{1} = 3 k Ω

, and

R_{C} = 20 k Ω

v_{1}

and

v_{2}

are purely

A C

signals with

0 D C

voltage. Determine the following: (a) The DC Q-points for

Q_{1}

and

Q_{2} . [4 p t

. (b) Draw the differential-mode and common-mode

A C

equivalent half-circuits for the differential amplifier. [ 6 pt.] (c) What is the differential-mode gain

(A_{d d})

? [4 pt.] (d) What is the common-mode gain

(A_{c m})

? [4 pt.] (e) What is the CMRR? [4 pt.] (f) What is the differential-mode input resistance? [4 pt.] (g) What is the common-mode input resistance? [4 pt.]