Amplifiers
• 0 Vote(s) - 0 Average
• 1
• 2
• 3
• 4
• 5
 seminar surveyer Active In SP Posts: 3,541 Joined: Sep 2010 23-12-2010, 11:47 AM   (2)Amplifier.ppt (Size: 1.65 MB / Downloads: 68) 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 Unity-Gain Amplifier Differential Amplifier Instrumental Amplifier The Electrocardiogram Amplifier