How to Design a BJT Analog Circuit with Specific Transfer Characteristics?

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Discussion Overview

The discussion revolves around designing a BJT analog circuit with specific transfer characteristics, focusing on achieving defined parameters such as gain, input resistance, and output resistance. The context includes a homework problem involving theoretical circuit design.

Discussion Character

  • Homework-related
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant outlines the need for a circuit with three stages, each serving a specific purpose: the first for input resistance, the second for gain, and the third for output resistance.
  • Another participant asks for clarification on which modules should be used for each stage to achieve the necessary gain.
  • A different participant questions the values of M1 and M2 as presented, suggesting that the requirements may be misinterpreted based on the diagram.
  • There is a request for a principle-based explanation of how to realize the corner frequencies in the circuit design.

Areas of Agreement / Disagreement

Participants express uncertainty regarding the interpretation of parameters and the design approach. There is no consensus on the correct modules to use or the realization of corner frequencies, indicating multiple competing views and unresolved aspects of the design.

Contextual Notes

Participants have not fully defined assumptions regarding the circuit design, and there are unresolved mathematical steps related to the gain and frequency parameters.

GGGboat
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Homework Statement


hello, i need to design analog circuit that has a transfer curve as seen in the following image using resistors, capacitors,voltage, and BJT (with beta value of 100).
the parameters are:
A=75
f1= 21Hz
f2=21 KHz
M1=40
M2=-20

the circuit also need to have input resistance of Rin= 60 kilo-ohm and output resistance of 51 kilo-ohm.

Homework Equations


I posted this yesterday and it was deleted so first of all, let me apologize if i gave the impression that i was trying to get you guys to do my homework for me. i most certainly wasn't (sorry I'm just pretty clueless at this point).

does my 3-stages solution make sense(see part 3:solution attempt)? is it the right approach?
how do I know which of the following modules should I use for each stage?

The Attempt at a Solution


[/B]
i think the circuit should have 3 stages, each connected with a capacitor, where the first stage is for achieving the required input resistance, the second for the required gain, and the third is for the required output resistance.

(the first and last stages might also add some gain but it will be considered in the second stage)
 

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f1 and f2 are the frequencies where the dotted lines are.
 
Well, which module(s) has/have the necessary gain?
Pick one or more and give us your first effort at a design.
 
M1=40
M2=-20

According to your diagram. one can get the impression that M1=20 and M2=-40 is required ?
Question: How do you intend - in principle(!) - to realize the corner frequencies?
 

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