+1 vote
in Linear Integrated Circuits by (37.1k points)
Find collector current IC2, given input voltages are V1=2.078v & V2=2.06v and total current IQ=2.4mA. (Assume α=1)

(a) 0.8mA

(b) 1.6mA

(c) 0.08mA

(d) 0.16mA

This question was posed to me in an international level competition.

The query is from Operational Amplifier Internal Circuit topic in portion Operational Amplifier of Linear Integrated Circuits

1 Answer

0 votes
by (39.8k points)
Accurate answer is (a) 0.8mA

Paint a vivid picture of understanding with: Collector current,  IC2=αF×IQ/(1+e^Vd⁄VT),

VT = Volts equivalent of temperature = 25mv,

 ⇒ Vd = V1-V2   =2.078v-2.06v=0.018v    (equ1)

Substituting equation 1,

  ⇒ Vd/VT  = 0.018v/25mv  =   0.72v (equ2)

Substituting equation 2,

 ⇒ IC2= 1×2.4mA/(1+e^0.72)  =  2.4mA/(1+2.05)  = 0.8mA.

Related questions

We welcome you to Carrieradda QnA with open heart. Our small community of enthusiastic learners are very helpful and supportive. Here on this platform you can ask questions and receive answers from other members of the community. We also monitor posted questions and answers periodically to maintain the quality and integrity of the platform. Hope you will join our beautiful community