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Analog & Digital Electronics

Analog & Digital ElectronicsCourse No: PH-218 Lec-14: Feedback AmplifierCourse Instructors: Dr. A. P. VAJPEYID epartment of Physics, Indian Institute of Technology Guwahati, India1 Marks distribution: Quiz-2 345678 MarksStudents20123123456789101112 Highest: 07 ( 1 student)Lowest: 00 ( 5 students)Feedback Amplifier Feedback amplifier contains two component namely feedbackcircuitand amplifier circuit. Feedback circuit is essentially a potential divider consisting ofresistances R1& R2 The purpose of feedback circuit is to return a fraction of theoutputvoltage to the input of the amplifier circuit Feedback amplifier 21212 RRRVV+== feedback fraction Both negative feedback and positive feedback are used in amplifiercircuits.

Basic Feedback Topologies Depending on the input signal (voltage or current) to be amplified and form of the output (voltage or current), amplifiers can be

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