The positive input terminal now is connected to the input voltage source. The closed loop gain is solely determined by the feedback resistors R f and R i assuming that the loop gain of the circuit is very large. Non inverting amplifier A non inverting amplifier is shown in Fig The principal features of this configuration are The amplifier is non inverting with the feedback loop closed. The closed loop gain of this amplifier is (7 1) Figure 7 2: Non inverting amplifier configuration 2. This is often referred to as the virtual ground property of feedback op amps. Chiu 1Ģ input must follow the potential of the positive one with feedback loop closed due to the large loop gain developed by the op amp. The positive input terminal is always grounded in this configuration. The closed loop gain is solely determined by the feedback resistors R f and R i assuming that the loop gain defined as the product of the open loop gain of the op amp and the feedback factor of the circuit is very large.
Inverting amplifier An inverting amplifier is shown in Fig The principal features of this configuration are The amplifier is inverting with the feedback loop closed. (In case you are curious, these pins are used for offset adjustment for the op amp.) Figure 7 1: Inverting amplifier configuration 1. Note that the amplifier has two terminals labeled os1 and os2 besides the regular pins, and you can leave these two pins unconnected.
You can get the µa741 part from the library called EVAL. In this lab, we will be simulating four basic configurations using the µa741 op amp. Negative feedback amplifier with op amp operating at its core provides key to highly reliable and stable analog functions. When used properly in negative feedback configurations, the overall closed loop transfer characteristic can be precisely set by stable passive components such as resistors, capacitors, and diodes, regardless of the potential variation of open loop parameters. Introduction Operational amplifier is one fundamental building block of analog circuits. We will be simulating and building some basic op amp circuits, including the four most common types, i.e., the inverting, non inverting, differencing, and summing amplifiers. 1 Lab 7: Operational Amplifiers Part I Objectives The objective of this lab is to study operational amplifier (op amp) and its applications.