Amplifiers
seminar surveyer Active In SP Posts: 3,541 Joined: Sep 2010 
23122010, 11:47 AM
(2)Amplifier.ppt (Size: 1.65 MB / Downloads: 66) Function of Amplifiers Amplifiers provides GAIN Filtering, Signal processing, Correction for Nonlinearities Ideal OP Amps Transfer Function = Output / Input Voltage Amp TF (Gain): Usually Av 1 OP Amp is preferred Easy to use in circuit designed compared to discrete Transistor circuits Ideal OP Amps (Cont.) Assumptions Open loop Gain = Infinity Input Impedance Rd = Infinity Output Impedance Ro = 0 Bandwidth = Infinity Infinite Frequency Response vo=0 when v1 = v2 No Offset Voltage Ideal OP Amps (Cont.) Note v0 = A(v2 – v1) If v0 = , A = (Typically 100,000) Then v2 – v1 = 0 v2 = v1 Since v2 = v1 and Rd = We can neglect the current in Rd Rule 1 When the OP Amp is in linear range the two inputs are at the same voltage Rule 2 No Current flows into either terminal of the OP Amp Basic OP Amp Circuit Blocks Inverting Amplifier Noninverting Amplifier UnityGain Amplifier Differential Amplifier Instrumental Amplifier The Electrocardiogram Amplifier 



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