91.6.1. Effects of Non-Ideal Resistance

To create that situation we have considered this ideal situation namely the resistance here it is ∞. So, I am keeping this is open so, R it is ∞. On the other hand output resistance here R , so that is equal to 0. So, output resistance here it is 0.

In this chunk, we introduce the concept of ideal conditions in electronic circuits. We assume that the input resistance (R) is infinite, meaning it does not load the circuit, and the output resistance (R) is zero, ensuring that the source can deliver current without any loss. This setup avoids any potential loading effects that could distort the circuit's performance.

Imagine a water system where the pipe delivering water (input resistance) is infinitely wide, allowing any amount of water to flow without resistance, and the outlet (output resistance) has no blockage, letting all water pass freely. This setup ensures optimal performance, similar to our ideal circuit model.

So, the since the resistance here it is 0. So, whenever we are trying to tap the signal for the feedback network, so then it is not creating any loading effect.

Here, we discuss how a zero output resistance allows for optimal feedback signal capture without affecting the operation of the circuit. When the output resistance is zero, we can collect the feedback signal efficiently, maintaining the integrity of the signal processed through the circuit.

Think of a chef who wants to taste a soup while cooking. If he uses a small spoon (zero resistance), he can take a taste without removing much of the soup or changing its flavor. Similarly, the feedback in our circuit can be sampled without altering how the system functions.

So, if I say that this is v this is + and this is ‒. So, v = v ‒ v.

This chunk introduces the relationship between different voltages in the feedback circuit. It highlights how the output voltage relates to the input signals through a specific mathematical relationship. Understanding this relationship is crucial for analyzing circuits effectively.

Consider a situation where two people are comparing heights. If one is taller than the other by a specific amount, you can express that difference in simple terms: height difference = taller person's height - shorter person's height. Here, the simple equation mirrors our voltage relationship in circuits.

So, in summary this configuration typically or most of the time we refer as shunt-series feedback.

This section wraps up previous discussions by naming the feedback configuration as 'shunt-series feedback.' In this configuration, signals are collected in a way that combines two methods: shunt sampling at the output and series mixing at the input, ensuring efficiency and clarity in how feedback is processed.

Imagine a chef using two different bowls: one for mixing ingredients (series) and another for tasting (shunt). This hybrid approach allows the chef to control the process efficiently, just as our circuit does with its feedback configuration.

So, we need not to consider A′ rather A′ it is same as A and likewise β′ right.

In practical scenarios, we might encounter non-ideal resistances, which could shift the relationships in our circuit. However, in ideal situations, we often simplify our calculations because some variables (like A and β) can still be considered interchangeable. This simplification helps in making quick calculations while understanding potential real-world implications of resistance.

Think of a sports team where players have set positions. In an ideal game, each player sticks to their role effectively. But in a real game, players may occasionally switch roles due to strategy or fatigue. While such dynamics exist, the team still functions as a unit, similar to how we analyze circuits under non-ideal conditions.

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