Negative feedback is widely applied in amplification circuits. Different negative feedbacks yield different impacts on the performance of amplification circuits. The impacts of negative feedback on the performance of amplification circuits are analyzed, so that an appropriate negative feedback can be adopted in designing amplification circuits to meet specific requirements.

Negative feedback has been widely used in amplification circuit. Different types of negative feedback which can improve the performance of amplification circuits are introduced. The judgment methods of negative feedback type in amplification circuit is discussed so that the negative feedback types can be quickly and accurately analyzed and adopted when amplification circuits are analyzed and designed.

The three basic amplification circuits in analog circuit are important teaching contents. With wide applications, they serve as the foundation of other multi-stage amplification circuits. The three basic amplification circuits which are common-emitter circuit, common-collector circuit, and common-base circuit are analyzed from static and dynamic aspects. Also their characteristics and applications are compared.

In the digital electronic technology,logic function simplified by karnaugh map is the important knowledge which need to master while analysing and designing logic circuit.The commonly used methods and practical skills of logic function simplifying by karnaugh map are discussed through the practical examples.