Subject and UNIT: Electron Devices and Circuits: Unit V: (a) Feedback Amplifiers
All the advantages mentioned above are obtained at the expense of the gain with feedback, which is lowered in comparison with the transfer gain A of an amplifier without feedback.
Subject and UNIT: Electron Devices and Circuits: Unit V: (a) Feedback Amplifiers
• In feedback amplifier, we sample the output voltage or current by means of a suitable sampling network and apply this signal to the input through a feedback two port network, as shown in the Fig. 9.3.1.
with Equivalent circuit
Subject and UNIT: Electron Devices and Circuits: Unit V: (a) Feedback Amplifiers
• Based on the magnitudes of the input and output impedances of an amplifier relative to the source and load impedances, respectively, we can classify amplifiers into four broad categories : Voltage, current, transconductance and transresistance amplifiers.
Subject and UNIT: Electron Devices and Circuits: Unit V: (a) Feedback Amplifiers
Definition : The amplifier in which a part of output is sampled and fed back to the input of the amplifier is called feedback amplifier. Therefore, at input we have two signals : Input signal, and part of the output which is fed back to the input.
Electron Devices and Circuits
Subject and UNIT: Electron Devices and Circuits: Unit V: (a) Feedback Amplifiers
Electron Devices and Circuits: Unit V: (a) Feedback Amplifiers : Syllabus, Contents
Multistage and Differential Amplifiers | Electron Devices and Circuits
Subject and UNIT: Electron Devices and Circuits: Unit IV: Multistage and Differential Amplifiers
Electron Devices and Circuits: Unit IV: Multistage and Differential Amplifiers : University Questions with Answers (Long Answered Questions)
Multistage and Differential Amplifiers | Electron Devices and Circuits
Subject and UNIT: Electron Devices and Circuits: Unit IV: Multistage and Differential Amplifiers
Electron Devices and Circuits: Unit IV: Multistage and Differential Amplifiers : Two Marks Questions with Answers
Operation of the circuit, Equivalent circuit, Calculation, Advantages, Disadvantages
Subject and UNIT: Electron Devices and Circuits: Unit IV: Multistage and Differential Amplifiers
• The push pull circuit requires two transformers, one as input transformer called driver transformer and the other to connect the load called output transformer.
Subject and UNIT: Electron Devices and Circuits: Unit IV: Multistage and Differential Amplifiers
• The comparison of various amplifier classes is summarized in Table 8.16.1.
Subject and UNIT: Electron Devices and Circuits: Unit IV: Multistage and Differential Amplifiers
• The position of the quiescent point on the load line decides the class of operation of the power amplifier. The various classes of the power amplifiers are : i) Class A ii) Class B iii) Class C iv) Class AB v) Class D.
Features, Impendance Matching, Analysis
Subject and UNIT: Electron Devices and Circuits: Unit IV: Multistage and Differential Amplifiers
• The system consists of many stages connected in cascade. Hence basically it is a multistage amplifier.
Subject and UNIT: Electron Devices and Circuits: Unit IV: Multistage and Differential Amplifiers
• The important applications of tuned amplifiers are as follows :