Purchase Solution

Bias Stable Circuit Design with Capacitors

Not what you're looking for?

Ask Custom Question

For the circuit, design a bias stable circuit such that Icq=.8mA and Vceq=5V. Let Bf=100. Using the results, determine the percentage change in Icq if Bf is in the range of 75<=Bf<=150. Repeat this if Re=1kOhms.

Rth=.1(1+b)re=.1*101*.5Kohms=5050 Ohms
I can do KVL around the b-e loop to find Vth, but how do I split the two resisters out of Rth? Anything could be r1*r2/(r1+r2)

The capacitors are confusing me. If they act as opens, then RL is irrelevant? By the way, what is the function of the emitter capacitor? (just curious)

Is the part B, do you think the author means the difference between the upper value of Icb and the lower value of Icb? Or what percent of icblower is icb upper? It's a little confusing.

Thank you.

Attachments
Purchase this Solution
Solution Summary

For the circuit, design a bias stable circuit such that Icq=.8mA and Vceq=5V. Let Bf=100. Using the results, determine the percentage change in Icq if Bf is in the range of 75<=Bf<=150. Repeat this if Re=1kOhms.

Solution Preview

Please find your solution below.

part1.
Neglect the capacitors. Once you find the Rth, you should use the (r2/r1 +r2) to find Vth. becasue as ...

Purchase this Solution
Free BrainMass Quizzes
Intro to the Physics Waves

Some short-answer questions involving the basic vocabulary of string, sound, and water waves.

Introduction to Nanotechnology/Nanomaterials

This quiz is for any area of science. Test yourself to see what knowledge of nanotechnology you have. This content will also make you familiar with basic concepts of nanotechnology.

Classical Mechanics

This quiz is designed to test and improve your knowledge on Classical Mechanics.

The Moon

Test your knowledge of moon phases and movement.

Variables in Science Experiments

How well do you understand variables? Test your knowledge of independent (manipulated), dependent (responding), and controlled variables with this 10 question quiz.

View More Free Quizzes
Related BrainMass Solutions

  • NMOS FET and BJT analysis

    To design the circuit, the emitter is connected to ground, the MCU output pin is connected to the base with a 10kΩ resistor in between, the 5V supply is connected to the anode of the LED in series with a 220Ω resistor, and the cathode of the LED is connected

  • Understanding capacitors and inductors

    5) How do you design a circuit to use caps or inductors in a dc circuit? An ac circuit? 6) What is a biasing cap? 1.In practice, most digital circuits such as microcontroller circuits are designed as direct current (DC) circuits.

  • Bias Stable Transisor Design Problem

    14227 Bias Stable Transisor Design Problem Please help with the following problem. The DC load line and Q point of the circuit are shown next to the circuit. For the transistor, Beta=120.

  • Amplifier Design

    a) Schematic diagram of final design with all component values indicated. b) A short "theory of operation", that is, describe in words how the circuit works.

  • Capacitor circuits: 12 capacitors in hexagonal configuration

    bellow The capacitance of capacitors C and 2C (A-F-E) in series and the equivalent will be And these capacitors on each side are in parallel with 2C (A-B) and will give equivalent equal to And the circuit reduces to

  • Diodes, transistors (including BJT) and current mirrors

    These capacitances limit what frequencies the transistors can operate as the capacitors act as AC impedances that decrease with increasing frequency.

  • Growth of current in a C-R circuit

    622084 Growth of current in a C-R circuit Three capacitors each with capacitance C and a parallel combination of two resistances R each are connected in series with an ideal battery of emf V as in figure.

  • Capacitors and Oscilloscopes

    71570 Capacitors and Oscilloscopes Design a circuit to determine the capacitance of a capacitor using a known resistance, an oscilloscope, a function generator, and an unknown capacitor (explicitly show all the components in your circuit diagram and explain

  • Capacitors

    Using the schematic symbols (see attachment), draw a diagram of a circuit with the two capacitors connected in series with the battery. Draw a diagram of a circuit using the same battery and capacitors with the capacitors connected in parallel.

View More Related Solutions