Subject and UNIT: Electronic Devices and Circuits: Unit III: Multistage Amplifiers and Differential Amplifier
Anna university important solved problem of Multistage Amplifiers and Differential Amplifier
Methods, Hazeltine, Neutrodyne, Rice Neutralization, Neutralization Using Coil
Subject and UNIT: Electronic Devices and Circuits: Unit III: Multistage Amplifiers and Differential Amplifier
In tuned amplifiers, the transistors are used at resonant frequency to amplify the narrow band of high frequencies. At this frequency, the junction capacitance between base and collector of the transistor becomes dominant. Thus the reactance of the circuit is low. This reactance provides a positive feedback which causes oscillations in the circuit and makes the system unstable.
Stagger-Tuned Amplifier, With Solved Problems
Subject and UNIT: Electronic Devices and Circuits: Unit III: Multistage Amplifiers and Differential Amplifier
To overcome the drawback of single tuned amplifier, double tuned amplifiers are used. In this method, two tuned circuits are inductively coupled to each other.
Single Tuned Amplifiers
Subject and UNIT: Electronic Devices and Circuits: Unit III: Multistage Amplifiers and Differential Amplifier
A number of tuned amplifier stages are connected together in cascade so that large voltage gain can be obtained. These tuned amplifiers are classified as i. Single Tuned Amplifier ii. Double Tuned Amplifier iii. Stagger Tuned Amplifier
Parallel Resonant Circuit
Subject and UNIT: Electronic Devices and Circuits: Unit III: Multistage Amplifiers and Differential Amplifier
An amplifier which amplifies a specific frequency is called tuned voltage amplifier or tuned amplifier. In situations, when the receiver is required to pick up and amplify the desired radio frequency signal and reject the other frequencies, tuned amplifiers are used.
MOSFET Differential Pair
Subject and UNIT: Electronic Devices and Circuits: Unit III: Multistage Amplifiers and Differential Amplifier
The JFET differential amplifier with resistive load is considered for the analysis. MOSFETs are widely used in the input stages due to their better stability.
Single Input Balanced Output Differential Amplifier, Single Input Unbalanced Output Differential Amplifier
Subject and UNIT: Electronic Devices and Circuits: Unit III: Multistage Amplifiers and Differential Amplifier
The dual input unbalanced output differential amplifier. It has two inputs and the output voltage is measured only at one collector with respect to ground.
Operation, Analysis, Summary
Subject and UNIT: Electronic Devices and Circuits: Unit III: Multistage Amplifiers and Differential Amplifier
The input signals are given to both the input terminals and so it is called as "dual input". The output is taken between the collectors of the two transistors. Hence, it is called as "balanced output". As the output is the difference between the output of two collectors, it is called differential output. Thus, the amplifier is called dual input balanced output differential amplifier.
Subject and UNIT: Electronic Devices and Circuits: Unit III: Multistage Amplifiers and Differential Amplifier
The differential amplifier is used to amplify the difference between two input signals. The differential amplifier may be implemented using BJTS or FETs and it is the commonly used building block in analog IC design.
FET Cascade Amplifier
Subject and UNIT: Electronic Devices and Circuits: Unit III: Multistage Amplifiers and Differential Amplifier
The common gate amplifier stage is connected in cascade with a common source amplifier stage.
Subject and UNIT: Electronic Devices and Circuits: Unit III: Multistage Amplifiers and Differential Amplifier
Single stage transistor amplifiers are inadequate for meeting most design requirements. Hence we use more than one amplifier stage. In multistage amplifier, the output of one stage is fed as the input of the next stage. This type of connection of amplifiers is called cascading.
Subject and UNIT: Electronic Devices and Circuits: Unit II: Amplifiers
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