I was given this question And I’m so confused on step B) I posted this question

Question

I was given this question And I’m so confused on step B) I posted this question several times on here and I keep getting the same response, and I can’t seem to understand If there are to r(o)s why do you guys only use one And why is R2 and R3 in parallel Please explain this step I keep trying to understand it and I keep looking in the Sedra electronics book but I don’t see it And explain why vid/2. This is what I’ve done 3. Refer to the following amplifier. All transistors have a -200, and assuming V 50 V. (55 points) (a) Calculate Q point for each transistor, i.e. Ic and Vce. (15 points) (b) If Qi is connected to an AC signal of 50 mV instead grounded what is the AC voltage on R4? (10 points) (c) Calculate the input resistance under condition of part (b) (5 points) (d) If Q2 is connected to an identical AC signal as Qi is, what will be the AC voltage on R4? (10 points) (e) Calculate the CMRR of this circuit in a unit of dB? (5 points) ( Calculate the input resistance under condition of part (d). (10 points) R2 2.00k R3 2.01 V2 C1 01 Q2 R4 4.7ka Q3 Q4 R1 4.3 V1 15V

Explanation / Answer

b) R2 & R3 are parellel as you can see both have one common node other node are are different so they are in parallel.

We use Vid/2 because its a differential input which is

(Vid1 - Vid2)/2

& as Vid1 = 50 , Vid2 = 0

So, its (50-0)/2 = 25mV

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