# Cascaded amplifiers ppta

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- Common-Emitter Amplifiers - PowerPoint PPT Presentation
- Vel Tech High Tech Dr.Ranagarajan Dr.Sakunthala Engineering College Department of ECE
- multistage amplifiers
- MULTISTAGE AMPLIFIERS
- Signal transduction
- Chapter 15 Multistage Amplifiers
- Chapter #8: Differential and Multistage Amplifiers
- Tuned Amplifiers
- 6 OFC 7 mod2 Optical Amplifiers (1)
- Electrical Circuits

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## Common-Emitter Amplifiers - PowerPoint PPT Presentation

The types of amplifiers that we have discussed so far cannot work effectively at radio frequencies, even though they are good at audio frequencies. Also, the gain of these amplifiers is such that it will not vary according to the frequency of the signal, over a wide range. This allows the amplification of the signal equally well over a range of frequencies and does not permit the selection of particular desired frequency while rejecting the other frequencies. So, there occurs a need for a circuit which can select as well as amplify.

So, an amplifier circuit along with a selection, such as a tuned circuit makes a Tuned amplifier. Tuned amplifiers are the amplifiers that are employed for the purpose of tuning. Tuning means selecting. Among a set of frequencies available, if there occurs a need to select a particular frequency, while rejecting all other frequencies, such a process is called Selection.

This selection is done by using a circuit called as Tuned circuit. When an amplifier circuit has its load replaced by a tuned circuit, such an amplifier can be called as a Tuned amplifier circuit. The basic tuned amplifier circuit looks as shown below. The tuner circuit is nothing but a LC circuit which is also called as resonant or tank circuit. It selects the frequency. A tuned circuit is capable of amplifying a signal over a narrow band of frequencies that are centered at resonant frequency.

When the reactance of the inductor balances the reactance of the capacitor, in the tuned circuit at some frequency, such a frequency can be called as resonant frequency. It is denoted by f r. A tuned circuit can be Series tuned circuit Series resonant circuit or Parallel tuned circuit parallel resonant circuit according to the type of its connection to the main circuit.

The inductor and capacitor connected in series make a series tuned circuit, as shown in the following circuit diagram. At resonant frequency, a series resonant circuit offers low impedance which allows high current through it.

A series resonant circuit offers increasingly high impedance to the frequencies far from the resonant frequency. The inductor and capacitor connected in parallel make a parallel tuned circuit, as shown in the below figure. At resonant frequency, a parallel resonant circuit offers high impedance which does not allow high current through it. A parallel resonant circuit offers increasingly low impedance to the frequencies far from the resonant frequency.

The frequency at which parallel resonance occurs i. The main characteristics of a tuned circuit are as follows. The ratio of supply voltage to the line current is the impedance of the tuned circuit. Impedance offered by LC circuit is given by. Impedance of the circuit decreases for the values above and below the resonant frequency f r.

Hence the selection of a particular frequency and rejection of other frequencies is possible. At parallel resonance, the circuit or line current I is given by the applied voltage divided by the circuit impedance Z r i.

For a parallel resonance circuit, the sharpness of the resonance curve determines the selectivity. The smaller the resistance of the coil, the sharper the resonant curve will be.

Hence the inductive reactance and resistance of the coil determine the quality of the tuned circuit. The ratio of inductive reactance of the coil at resonance to its resistance is known as Quality factor.

It is denoted by Q. The higher the value of Q, the sharper the resonance curve and the better the selectivity will be. The usage of reactive components like L and C, minimizes the power loss, which makes the tuned amplifiers efficient. The selectivity and amplification of desired frequency is high, by providing higher impedance at resonant frequency.

A smaller collector supply VCC would do, because of its little resistance in parallel tuned circuit. It is important to remember that these advantages are not applicable when there is a high resistive collector load. For an amplifier to be efficient, its gain should be high.

The collector load in a tuned amplifier is a tuned circuit. The value of Z C depends upon the frequency of the tuned amplifier. As Z C is maximum at resonant frequency, the gain of the amplifier is maximum at this resonant frequency. The range of frequencies at which the voltage gain of the tuned amplifier falls to The range of frequencies between f 1 and f 2 is called as bandwidth of the tuned amplifier.

The bandwidth of a tuned amplifier depends upon the Q of the LC circuit i. The value of Q and the bandwidth are inversely proportional. The quality factor Q of the bandwidth is defined as the ratio of resonant frequency to bandwidth, i.

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## Vel Tech High Tech Dr.Ranagarajan Dr.Sakunthala Engineering College Department of ECE

Official websites use. Share sensitive information only on official, secure websites. Experiments were carried out at the National Institute of Standards and Technology, in collaboration with The Boeing Company, to obtain force and temperature. This contribution reports the results of the SHREC track: Retrieval and classification on textured 3D models, whose goal is to evaluate the performance of. The objective of this track is to evaluate the performance of 3D shape retrieval approaches on a large-sale com- prehensive 3D shape database which contains.

## multistage amplifiers

Block Diagram Cascaded Amplifier. These components are packaged in individual ics and have the familiar triangular symbol in a circuit diagram or schematic. Figure 1 displays a block diagram representation of three op amp circuits in cascade. In figure 3 the biasing arrangement and coupling elements have not been shown for the sake of celerity. In this unit we will consider how to combine the blocks corresponding to individual subsystems so. A cascaded amplifier simply means multiple amplifiers lumped together into a single device. Here we will modulate the strength of the voice so it is voice amplification.

## MULTISTAGE AMPLIFIERS

Embed Size px x x x x Such an amplifier is called a multistage amplifier. Such cascade and cascode connections are also possible in FET amplifiers. Use of coupling schemesWhen amplifiers are cascaded, it is necessary to use a coupling network between the output of one amplifier and the input of the following amplifier. This type of coupling is called as inter stage coupling These coupling networks serves the following It transfers the ac output of one stage to the input of the next stage It isolates the dc conditions of one stage to the next stage It also provides impedance matching.

## Signal transduction

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## Chapter 15 Multistage Amplifiers

Sedra and Kenneth C. Smith Differential amplifier circuits of varying complexity; utilizing passive resistive loads, current-source loads, and cascodes - the building blocks studied in Chapter 7. An ingenious and highly popular differential-amplifier circuit that utilizes a current-mirror load. Two practical examples are studied in detail: a two-stage CMOS op-amp and four-stage bipolar op-amp. Smith IntroductionThe differential-pair of differential-amplifier configuration is widely used in IC circuit design.

## Chapter #8: Differential and Multistage Amplifiers

The types of amplifiers that we have discussed so far cannot work effectively at radio frequencies, even though they are good at audio frequencies. Also, the gain of these amplifiers is such that it will not vary according to the frequency of the signal, over a wide range. This allows the amplification of the signal equally well over a range of frequencies and does not permit the selection of particular desired frequency while rejecting the other frequencies.

## Tuned Amplifiers

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## 6 OFC 7 mod2 Optical Amplifiers (1)

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## Electrical Circuits

To troubleshoot and fault analysis of power supplies. K2 C Robert L. Millman J, Halkias.

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