Transistor design problem

Redesign the circuit showin using Vcc=9V such that the voltage drop across Rc = 1/3VCC and the voltage drop across Re=1/3VCC. Assume Bf=100. the quiescent collector current is to be IcQ=.4mA and the current through R1 and R2 should be approximately .2Icq. Replace each transistor with the closest standard value. What is the v ...continues

AC/DC BJT transisitor Circuit Analysis

For the circuit in the image, Beta=120, VCC=5V, Va=100V, and Rb=25kohms. Determine Vbb and RC such that Rpi=5.4kOhms and the Q-point is in the center of the load line. I have a formula for Rpi=(Vt*Beta)/Icq. From this I found Icq=1.25x10^-4 Amps. However, is this a correct way to determine Icq? The question said to d ...continues

Common emitter amplifer

The parameters of the transistor are Beta=100 and Va=100V. Find the DC voltages at the base and emittter terminals. See attachment for circuit.

Drain current

Please see the attached file for full problem description.

Theoretical and analytical questions

1- Sketch the dc transfer characteristic of the circuit shown below. [VBE(on) = 0.7 V] and also explain the theory behind the working of this circuit. (see diagram in attached file) 2- what is the relationship between gain and bandwidth in amplifiers with negative feedback? How about positive feedback? - what is the adv ...continues

Oxide breakdown voltage

Please see the attached file for full problem description.

Cap / inductor questions

1) If caps block dc what is the purpose of a cap in a dc circuit? 2) What does an inductor do in a dc circuit? 3)What is the point of having a cap to ground in a dc circuit? 4)What is the purpose of a null modem? 5) How do you design a circuit to use caps or inductors in a dc circuit? An ac circuit? 6) What is a ...continues

Full Wave Center Tap Bridge Rectifier - what is the v drop?

In attached image, How is VDC across the load resistor found? The practice test has an answer of 28.24 ignoring the ripple voltage. VDC across the resister is Vout right? So, Vsecondary - the voltage drop in the diode = Vout = VDC So, if the secondary winding has 40voltage - .7V drop in the top resistier, that's 39.3V. ...continues

BJT AC/DC loadline analysis

The problem says to Find Icq, Vceq; plot dc and ac loadlines, calculate the small signal voltage gain, then determine the input and output resistances (Rib and Ro). Beta=120. Va=infinity.

PNP BJT AC/DC circuit analy

For the circuit/problem in the picture: When doing KVL to find ib, do I add .7 or subtract .7 because it is a pnp transistor? What is the small signal equivalent circuit? Thanks.