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

Explain signal description of 8085, Explain signal description of 8085 ...

Explain signal description of 8085 a) Address bus b) Control and status signal c)  Address latch enable d)  S1,S0 status signals e)  Read ,write signal

Find the net force experienced by a positive charge, Q. Two charges of equa...

Q. Two charges of equal magnitude 5µC but opposite sign are separated by a distance of 10 m. Find the net force experienced by a positive charge q = 2 µC that is placed midway betw

Microprocessor, highest priority interrupt in 8085 microprocessor

highest priority interrupt in 8085 microprocessor

Process , Process The rectangle symbol  is used to represent  the pro...

Process The rectangle symbol  is used to represent  the process  operations as shown below.   MOV A, B

Microprocessors, Memory location 2000H has the word 5000H stored in it. Wha...

Memory location 2000H has the word 5000H stored in it. What does each location contain after DEC WORD PTR [2000H].

Find the reverse saturation current of the bej, Q. A silicon BJT has an emi...

Q. A silicon BJT has an emitter current of 5m Aat 300 K when the BEJ is forward-biased by vBE = 0.7 V. Find the reverse saturation current of the BEJ. Neglecting ICBO, calculate iC

Determine the dimensions of the new model, The manufacturers of the tank de...

The manufacturers of the tank described in Problem would like to  design another model, with twice the capacity of the one described in figure. The ratio of height to diameter must

#title.energy harvesting from door movement., How to convert mechanical ene...

How to convert mechanical energy into electrical energy

Explain thermoplastic materials, Explain Thermoplastic materials. Ther...

Explain Thermoplastic materials. Thermoplastic materials: The properties of such plastic materials do not change considerably when they are melted and after that cooled and s

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