What do you mean by amplifier block, Electrical Engineering

Assignment Help:

Q. What do you mean by Amplifier block?

An amplifier can be modeled as a two-port device, that is, a box with two pairs of terminals designated as input and output, as shown in Figure (a). The circuit model of the amplifier block shown in Figure (b) is developed on the basis of the following considerations:

1. Since, for most amplifiers, the input current is proportional to the input voltage, the input terminals in the model are connected by a resistance Ri, known as the input resistance of the amplifier.

2. Since an amplifier delivers electric power (to a speaker, for example), the output current can be represented by its Thévenin-source model. The Thévenin resistance Ro is known as the output resistance and the Thévenin voltage is a dependent voltage source Avin, where A is called the open-circuit voltage amplification.

Thus, the amplifier block is a linear circuit block in which the output is proportional to the input, and the amplifier is characterized by the three constants Ri,Ro, and A. The input and output resistancesmay be generalized to input and output impedances in ac systems. The advantage of the model is that all internal complexities are summarized in the three constants, thereby simplifying the analysis of electric systems with amplifiers. Power-supply connections are usually not shown in circuit diagrams since they would only clutter up the drawing. It is assumed, however, that there are always connections to some power source in order to bring in the power necessary to run the amplifier.

158_What do you mean by Amplifier block.png


Related Discussions:- What do you mean by amplifier block

Magnetic Bond Method:, how does the magnetic bond method work? Application ...

how does the magnetic bond method work? Application of the magnetic bong method & advantages and disadvantages of the magnetic bond method.

Factors that influence choice of carrier frequency, 1. Why must a modem be ...

1. Why must a modem be used to transmit binary data through a PSTN? (1) Use sketches and additional text to describe the following modulation methods. (a) Amplitude shift key

Safe conduct in electricity and gas hazards, Safe Conduct : what if a tr...

Safe Conduct : what if a trailing flex became caught up in an apparatus trolley and was cut? Or someone splashed water onto a plug, or concentrated sulphuric acid onto a flex? F

Explain polyphase induction motor, Q. Explain polyphase induction motor? ...

Q. Explain polyphase induction motor? The polyphase induction motor operates with polyphase alternating current applied to the primary winding, usually located on the stator of

Determine the supply current and the supply voltage, A single phase line ha...

A single phase line has an impedance of 8.4 + j11.2 ?. The line feeds a load consisting of a resistor and an inductor connected in parallel as shown in Figure 1. The load is absorb

Vhdl, Im doing my final year project and Im stuck in vhdl coding. The main...

Im doing my final year project and Im stuck in vhdl coding. The main mission of this project is to design and build a tap changer which is going to be fitted to power transformers

What is meant by microcontroller, What is meant by microcontroller? A d...

What is meant by microcontroller? A device which having the microprocessor with integrated peripherals like memory, serial ports, parallel ports, timer/counter, interrupt contr

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd