ch4 FB freqy responce lec 1

Frequency response with F.B

Here we considered the effect of negative feedback on circuit parameters such as gain and terminal impedance. We saw that. The application of negative feedback resulted in a number of performance improvement, such as reduced sensitivity gain to active device parameter changes and reduction of distortion due to nonlinearity.

In this chapter, we see the effect of negative feedback on the frequency response of a circuit. The possibility of oscillation in feedback circuits is illustrated, and methods of overcoming these problems. Finally, the performance of feedback amplifiers is investigated.
In addition to the forgoing effects, negative F.B will also tend to broad band the amplifier. Because the use of negative feedback allows the designer to trade gain for bandwidth, negative feedback is widely used as a method for designing broadband amplifiers. The gain reduction that occurs is made up by using additional gain stages, which in general are also feedback amplifiers, and also it large the bandwidth so that the gain bandwidth product maintain the same with and without F.B. the frequency response is taking with single pole and tow poles.