Transistor designs

1) If rd (= 1/gd) is included in an ac-equivalent of a common-base amplifier, (a) show that the appropriate expression for Avi is [(gd + gm)(RC║RL)] / [1+ gd (RC║RL)]. (b) Show that Zo is RC║[rd + (1 + rdgm)(RE║Rs║rπ)]. 2) Design a common-emitter amplifier to provide a gain |Avi | ≥ 200 between a source having Rs = 0.3 kΩ and a load RL = 6 kΩ. The input impedance is to be greater than 1 kΩ and Vcc ≤ 20V. Facts about the transistor are: 150 ≤ βdc ≤ 400, βo = βdc, n = 1, 0.6 ≤ VBE ≤ 0.7V, ICEO = 0, RBB = 5KΩ, rd = ∞, and VA = 150V.

Power supply design

Design a half-wave unregulated power supply to give VL = 15V at IL = 10mA with v  0.1V. Assume a 120V, 60Hz supply. What is the regulation of the power supply

ss gain and time constants

The common-emitter circuit has an emiter bypass capacitor. (a) Derive the expression for the small-signal voltage gain Av(s)=Vo(s)/Vi(s). Write the expression in a form similar to that of equation 7.59 (Av=(-Gm*Rpi*Rc)(Rs+rpi+(1+Beta)Re)*((1+s*taua)/(1+s*taub)). (b) What are the expressions for taua and taub? Attached is the circuit. I am so far behind in this class; I really wish I could drop it. I need a cookbook version of Bipolar AC analysis instead of the obtuse, bloated technical text book used to teach the class. So, please help. How did you find the small signal voltage gain exactly? Why is the equation sited so important? and what are the time constants? Why are the... click for more

Bode Plots

Sketch the Bode magnitude plots for the following functions: (a) T(s)=-10s/(s+20)(s+2000) (b) T(s)=10(s+10)/(s+1000) ...Bode plots were introduced in my second circuit analysis class, but really didn't think it was important because it looked like an outdated tool no longer in use. Other than changing s to jw and plotting in exponential incriments of 10, I really don't know how to produce a bode plot. Please take the time to explain exactly how to produce a bode plot and what the important features are. Thank you.

Differential Amplifier with Resistor Biasing

I am currently working on a PSpice project from my Electronic Circuit Applications class and I am having some difficulties completing it because I can't find the common/differential mode gain and common/differential input impedance. I have been struggling with this project for a week and I need some guidance. I have completed most of the project and I would like to know also if what I have is correct so far. Please show me how to complete this and what the correct answer is. I have attached what I have done so far in pdf format. In the file are the specifications of the project as well. I also attached ch.11 of the textbook I use in class in case you need any reference. I have read the w... click for more