What is the configuration of cascode amplifier?

The cascode amplifier configuration has both wide bandwidth and a moderately high input impedance. The cascode amplifier is combined common-emitter and common-base. This is an AC circuit equivalent with batteries and capacitors replaced by short circuits.

What are the transistor configurations used in a cascode amplifier?

Cascode amplifier is generally constructed using FET ( field effect transistor) or BJT ( bipolar junction transistor). One stage will be usually wired in common source/common emitter mode and the other stage will be wired in common base/ common emitter mode.

What are the input and output impedances of CE configuration?

Therefore, in a CE amplifier, as the positive going signal appears as a negative going signal, it is understood that there is a phase shift of 180o between input and output. CE amplifier has a high input impedance and lower output impedance than CB amplifier.

What is cascode configuration of multistage amplifier?

The cascode is a two-stage amplifier that consists of a common-emitter stage feeding into a common-base stage. Compared to a single amplifier stage, this combination may have one or more of the following characteristics: higher input–output isolation, higher input impedance, high output impedance, higher bandwidth.

Which is the most preferred configuration for cascade amplifiers?

The circuit can be designed with two configurations of a transistor namely CE (common-emitter) and CB (common base). The CB (common base) configuration provides a good high-frequency operation.

How does cascode amplifier work?

Cascode amplifier is implemented as a multiplying mixer in the superheterodyne receivers. For the upper gate, the mixer is fed with the oscillator signal, and the lower gate s fed by RF signal. Then both these signals are multiplied and the IF is considered as the upper drain of the mixer-amplifier.

What is input impedance of CE configuration?

The input impedance is typically around 1kΩ, although this can vary considerably according to the circuit values and conditions. The low input impedance results from the fact that the input is applied across the base and emitter where there is a forward-biased junction, Also the output impedance can be relatively high.

What is input and output impedance of amplifier?

The input and output impedance of an amplifier is the ratio of voltage to current flowing in or out of these terminals. The input impedance may depend upon the source supply feeding the amplifier while the output impedance may also vary according to the load impedance, RL across the output terminals.

What is the input and output impedance of cascade amplifier?

• The input impedance of the cascade amplifier is that of stage 1, Zi = RG1. • Output impedance is that of stage 2, Z0=RD2. • The main function of cascading the stages is the larger overall gain achieved.

What is the advantage of using CB amplifier configuration in a cascading transistor configuration?

2. What is the advantage of using CB amplifier configuration in a cascading transistor configuration? Explanation: The cascading transistor configuration circuit can be constructed with two configurations of a transistor that is CE (common-emitter) and CB (common base).