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Unformatted text preview: ELEC321 APPLIED ELECTRONICS III EXPERIMENT 1 FEEDBACK PRINCIPLE & STABILITY ANALYSIS IN MULTIPLE-POLE AMPLIFIER Name ： TENG CHENG Student No.: DA928240 Major: FSTEE Email addresses: firstname.lastname@example.org ABSTRACT This paper presents the characteristics of feedback and how the system to be stable or unstable in multiple-pole amplifier. KEY WORDS Feedback; stability; s-plane; close-loop gain. 1. Introduction The main objective of the experiment is to learn the basic feedback principle and the stability analysis in multiple- pole amplifier. 2. Procedure and data analysis (a) Construct and Analyze the multi-stage amplifier, the circuit is shown as Fig.1: Figure 1 A multiple-pole amplifier Measure and record the actual value of each resistor, in the circuit, the load voltage is sampled and the current is mixed with the source voltage that is to say it is a current mixing voltage sampling. Hence, it is a shunt- shunt feedback topology and Y-parameters are used, and the source network can be changed to: Re=[100k+(100//10k)] Ω Iin= ¡¢¢££¡¢¤¥¦§ ¡¢¤¨¡¢¢¤© ¡¢¢££¡¢¤¥ª And the feedback network is : « ¬ ® ¯°°±¥²££³´¥ ¯°°±²¨ ¯°°±²££³´¥ µ ³¶ª and assume the op-amp are ideal, then we can get: 1 ) ( 1 s A ; 1 2 1 1 10 ) ( b s k R s A ; 2 3 1 1 ) ( b s s A ; 3 4 1 1 ) ( b s s A ; And ) 3 , 2 , 1 ( 1 i RC i bi ) ( ) ( ) ( ) ( ) ( 4 3 2 1 s A s A s A s A I V I V s A i A i o So we can get: A f (s)= ·¡¢¢¤²¸¹¨ ¸º££¸»¥©¡¢¢¤²ª££¸¼½¨ ¡¢¢¤²¥££¸»©¸ºª...
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