1 Basic Feedback Concepts The basic concept of negative feedback is shown in Fig

Question

1 Basic Feedback Concepts The basic concept of negative feedback is shown in Figure 1.1 SE Si Sfb FIGURE 11: BASIC FEEDBACK TOPOLOGY The topology can be expressed using the following equations: where A is called the open-loop gain, often denoted Aou. where denotes the feedback factor Equation 1.3 shows that the feedback signal is subtracted from the input signal, hence the term "megative feedback". Combining Equations 1.1 - 1.3 leads to the following equa- tion: where ACL is called the closed-loop gain. For the case >>1, Equation 1.4 simplifies to: Applying negative feedback, improves a design in the following ways Reduction of the closed-loop gain sensitivity towards the open-loop gain

Explanation / Answer

Below are the specification of a Fairchild LM741A Opamp

Open loop gain =200V/mV=200000V/V

Input resistance = 2 MOhm

Output resistance = 75 Ohm

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