why do we need multistage amplifier

Learn how here. The overall gain of a multistage amplifier is the product of the gains of the individual stages (ignoring potential loading effects): Alternately, if the gain of each amplifier stage is expressed in decibels (dB), the total gain is the sum of the gains of the individual stages: There are a number of choices for the method of coupling the amplifier stages together. When more than one stages used in succession it is know as multi-stage amplifier. We will get the number of stages between the input and output of a multistage amplifier based on the number of transistors in the circuit. The circuit diagram of this configuration is shown below. Transformer coupling comes into its own in tuned amplifiers. Below is a simplified view of a cascade amplifier with two stages in series. The inter-stage coupling capacitor, \(C_{inter}\), prevents the DC potential at the collector of the first transistor from interfering with the bias established by \(R_1\) and \(R_2\) for transistor number two. In this impedance coupling method, the impedance of coupling coil depends on its inductance and signal frequency which is jwL. Joining one amplifier stage with the other in cascade, using coupling devices form a Multi-stage amplifier circuit. Transformer coupling is an alternative AC coupling. The complication in calculating the gain of cascaded stages is the non-ideal coupling between stages due to loading. The voltage gain of this amplifier is equivalent to the product of voltage gain result of separate stages. This process of joining two amplifier stages using a coupling device can be called as Cascading. Multi-stage amplifiers can get much closer to approximating the ideal voltage amplifier. They are connected via capacitor, electrical transformer, R-L or directly coupled depending on the application. The simplest, and most common, connection scheme is a cascade connection of identical, or similar, stages forming a cascade amplifier. This reduces voltage gain but has several desirable effects; input resistance is increased, output resistance is decreased, and bandwidth is increased. Affordable solution to train a team and make them project ready. It can also be used to provide a balanced to unbalanced transition. It may be emphasized here that a practical amplifier is always a multistage amplifier that may provide a higher voltage or current gain or both.

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