What are the advantages and disadvantages of cascode amplifier?

It has advantages for increasing bandwidth and for high-voltage amplifier applications. A cascode amplifier consists of a common emitter stage loaded by the emitter of a common base stage. A cascode amplifier has a high gain, moderately high input impedance, a high output impedance, and a high bandwidth.

What is a complementary pair of transistors?

In electronics, the Sziklai pair (also known as a complementary feedback pair (CFP) or “compound transistor”, and as a “pseudo-Darlington”) is a configuration of two bipolar transistors, similar to a Darlington pair.

What is Super Beta transistor?

2. Theoretical consideration. The super-beta composite system consists of a pair of transistors in which the emitter of one of the transistors is directly connected to the base of the other transistor. The set-up of this system is also known as the Darlington compound connection and is shown in fig. 1.

What is the early effect?

The Early effect, named after its discoverer James M. Early, is the variation in the effective width of the base in a bipolar junction transistor (BJT) due to a variation in the applied base-to-collector voltage.

What is the need of cascading?

A cascade amplifier is any two-port network constructed from a series of amplifiers, where each amplifier sends its output to the input of the next amplifier in a daisy chain. The complication in calculating the gain of cascaded stages is the non-ideal coupling between stages due to loading.

What do you mean by single stage amplifier?

When in an amplifier circuit only one transistor is used for amplifying a weak signal, the circuit is known as single stage amplifier. shows a single stage transistor amplifier. When a weak a.c. signal is applied to the base of the transistor, a small base current starts flowing in the input circuit.

What is meant by push pull amplifier?

A push–pull amplifier is a type of electronic circuit that uses a pair of active devices that alternately supply current to, or absorb current from, a connected load. DC current is cancelled in the output, allowing a smaller output transformer to be used than in a single-ended amplifier.

What is the definition of voltage gain?

The Voltage Amplification (Av) or Gain of a voltage amplifier is given by: With both voltages measured in the same way (i.e. both RMS, both Peak, or both Peak to Peak), Av is a ratio of how much bigger is the output than the input, and so has no units.

What is meant by cascode amplifier?

The cascode is a two-stage amplifier that consists of a common-emitter stage feeding into a common-base stage.

What is meant by crossover distortion?

Crossover distortion is the term given to a type of distortion that occurs in push-pull class AB or class B amplifiers. It happens during the time that one side of the output stage shuts off, and the other turns on.

What is the use of RC coupled amplifier?

R-C coupled coupling is the most widely used method of coupling in multistage amplifiers. In this case the Resistance R is the resistor connected at the collector terminal and the capacitor C is connected in between the amplifiers. It is also called a blocking capacitor, since it will block DC voltage.

Why common emitter configuration is preferred for amplification?

CE is most widely used because it provides the voltage gain required for most of the day to day applications of preamp and power amps.. More over, the CC has the avatar of CE as in Emitter Follower, This circuit also closely resemble a Common Emitter, and its work is to provide current gain.

What is a cascode amplifier?

A cascode amplifier consists of a common emitter stage loaded by the emitter of a common base stage. The heavily loaded common emitter stage has a low gain of 1, overcoming the Miller effect. A cascode amplifier has a high gain, moderately high input impedance, a high output impedance, and a high bandwidth.

What is meant by 3 db bandwidth?

The 3 dB bandwidth of an electronic filter or communication channel is the part of the system’s frequency response that lies within 3 dB of the response at its peak, which in the passband filter case is typically at or near its center frequency, and in the low-pass filter is near 0 hertz.

What is the Miller effect?

Although the term Miller effect normally refers to capacitance, any impedance connected between the input and another node exhibiting gain can modify the amplifier input impedance via this effect. These properties of the Miller effect are generalized in the Miller theorem.

Why multistage amplifier is required?

In this way the overall voltage gain can be increased, when number of amplifier stages are used in succession it is called a multistage amplifier or cascade amplifier. The load on the first amplifier is the input resistance of the second amplifier. The various stages need not have the same voltage and current gain.

Why do we use negative feedback in op amp?

The applied negative feedback can improve its performance (gain stability, linearity, frequency response, step response) and reduces sensitivity to parameter variations due to manufacturing or environment. Because of these advantages, many amplifiers and control systems use negative feedback.

What do you mean by cascading?

“Cascading” means that styles can fall (or cascade) from one style sheet to another, enabling multiple style sheets to be used on one HTML document.

What is loading effect in electronic circuit?

loading refers to the phenomena that occurs when a load circuit having low effective impedance is connected to a supply circuit having higher effective impedance. So on connecting the load circuit effective reduces the resistance, drawing more (load) current causing greater voltage drop in the supply circuit.

Why RC coupling is prefered in audio frequency range?

Resistance-capacitance (RC) coupling in amplifiers are most widely used to connect the output of first stage to the input (base) of the second stage and so on. This type of coupling is most popular because it is cheap and provides a constant amplification over a wide range of frequencies.

What do you mean by direct coupling?

A direct-coupled amplifier or DC amplifier is a type of amplifier in which the output of one stage of the amplifier is coupled to the input of the next stage in such a way as to permit signals with zero frequency, also referred to as direct current, to pass from input to output.(Bondad M.L., 2018, BSEE)

What is the use of coupling transformer?

The magnetic transformer can sometimes be used to provide DC isolation between circuits, but IMO the term “coupling transformer” is most often used when the device is used for changing the impedance levels.

What is a complementary pair of transistors?

In electronics, the Sziklai pair (also known as a complementary feedback pair (CFP) or “compound transistor”, and as a “pseudo-Darlington”) is a configuration of two bipolar transistors, similar to a Darlington pair.