Microelectric Circuits 9

Please check my work and if incorrect give me the correct answer Please refer to the problem stated in the attached file. (For the circuit shown below, find the values for Re and Rc to establish a collector current of 0.6 mA and a reverse-bias voltage on the collector-base junction of 2.2 V. Assume alpha is approximately equal to 1.) My answer is given below: We are to solve for Re Vc=(10-4)-2.2=3.8 Ie=Ic/1=.6/1=.6 Rc=Vc/Ic=3.8/.6=6.333 Ve=ln.6=.51

Microelectric Circuits 10

Please check my work and if incorrect give me the correct answer Please refer to the problem stated in the attached file. (For the circuit shown below, beta = 80. What is the value of Ic?) My solution is: Beta=80 Vbe=.7 Solve for Ic Step one: Vbb=+15*Rb2/(Rb1+Rb2)=15*50/(100+50)=+5 step two Rbb=Rb1//Rb2=(100*50)/(100+50)=33.33 Ie=(Vbb-Vbe)/Re+[Rbb/(Beta+1) =(5-.7)/3+(33.3/81)=4.3/3.41=1.26mA Ib=Ie/(Beta=1)=1.26/81=.01557mA Vb=Vbe+IeRe=.7+(1.26*3) alpha=80/81=.9877 Ic=alphaIe=.9877*1.26=1.244 Answer is A

A BJT having beta = 80 is biased at a dc collector current of 1.2 mA

A BJT having beta = 80 is biased at a dc collector current of 1.2 mA. Vt = 25 mV. Find the value of gm at this bias point. a. 24 mA / V b. 36 mA / V c. 48 mA / V d. 60 mA / V

Microelectric Circuits 12

Please check my work and if incorrect give me the correct answer Please refer to the problem stated in the attached file. (The transistor in the circuit shown below is biased with a constant current source I = 1.2 mA and has beta = 120 and Va = 100 V. Find the dc voltage at the base.) My answer: I=1.2 mA Beta=120 Va=100V Rb=10 1.2/120*8=-.08 Answer is A

Microelectric Circuits 13

Please check my work and if incorrect give me the correct answer Please refer to the problem stated in the attached file. (For the circuit shown below, find the largest value that Rd can have while the MOSFET remains in saturation. Id = 0.5 mA, Vd= 1 V. The NMOS transistor has Vt = 2 V.) My answer is Id=.5mA Vd=1 Vt=2 Vdd=5 Vss=-5 (Vdd-Vss+Vd)/Id= (+5-(-5)+1)/.5=22kOhms Answer is D