Effect of Negative Feedback on Output Impedance: Just as high input impedance is advantageous to an amplifier, so is low output impedance. With lower output impedance, the amplifier is better suited to drive a low…
Effect of Negative Feedback on Input Impedance: High input impedance is always desirable in an amplifier as it will not load the preceding stage or the input voltage source. Such a desirable characteristic can be…
Characteristics of Negative Feedback Amplifiers: The Characteristics of Negative Feedback Amplifiers are given below Stabilization of Gain With Negative Feedback: The variations in temperature, supply voltages, ageing of components or variations in transistor parameters with…
Advantages of Negative Feedback Amplifier: There are numerous advantages of negative feedback amplifier which outweigh its only drawback of reduction in gain. Among the advantages are : 1. Gain Stability: The voltage gain of an…
Feedback Amplifier - Block Diagram, Definition, Operation and Types: Figure 19.7 represents the block diagram of an Feedback Amplifier. The output quantity (either voltage or current) is sampled by means of a suitable sampling network…
Transresistance Amplifier - Definition and Equivalent Circuit: In transresistance amplifiers the input signal is current and the output signal is voltage. The ideal transresistance amplifier provides an output voltage in proportion to the signal current,…
Transconductance Amplifier - Definition and Equivalent Circuit: In transconductance amplifiers the input signal is a voltage and its output signal is a current. The ideal transconductance amplifier provides an output current which is proportional to…
Equivalent Circuit of Current Amplifier: The input signal in a current amplifier is essentially a current, and thus the signal source is most conveniently represented by its Norton equivalent (Fig. 19.3). The output quantity of…
Voltage Amplifier - Definition and Equivalent Circuit: Voltage amplifiers are intended to amplify an input voltage signal and provide an output voltage signal. The voltage amplifiers is essentially a voltage-controlled voltage source. The input impedance…
Stagger Tuned Amplifier - Circuit diagram and its Workings: In order to increase bandwidth, double tuned amplifiers are preferred, but their alignment is difficult. A much better overall response can be had by stagger tuning,…
