In multi-stage amplifiers, coupling devices are used to connect different stages of transistor circuits in cascade. When the output of the first stage is connected to the input of the second stage through a coupling/coupled device, then it is referred to as a coupled amplifier. The coupling devices would be a transformer or resistor or capacitor. Based on these devices, there are different types of coupling amplifiers/coupled amplifiers such as Direct-coupling amplifier, RC coupled amplifier, … [Read more...]
What is Cascode Amplifier : Circuit & Its Working
Cascode is a technique implied to improve the performance of the analog circuits. The same technique can be applied to transistors and the vacuum tubes to make the circuit better performance-wise. The word cascode is initiated in the year 1939 by Frederick Vinton Hunt's and Roger Wayne Hickman's article during the discussion of voltage stabilizer applications. The discussion was about to propose a method to replace the pentode by cascoding two triodes. In cascoding, two transistors are used … [Read more...]
What is an Isolation Amplifier : Working & Its Applications
Sometimes, while performing electrical operations, it becomes important for us to isolate one part of the circuit to another to prevent excess loss of energy. For that reason, we use an isolation amplifier which acts as an isolating device. The main purpose of the isolation amplifier is to electrically separate the circuit which comes before the amplifier from the circuit which comes after the amplifier. So, basically we can say that an isolation amplifier can be used to give ohmic isolation … [Read more...]
What is Tuned Amplifier : Types & Its Applications
In the field of wireless communication, the signal strength must be increased to transmit the signal for long distances. So this can be made possible by using the amplifier. It enhances the strength of the signal without altering the information. Amplifiers are of various types based on the frequency ranges and applications. The required ones are selected and placed in the circuit. For audio signal amplifications, audio amplifiers are used. The audio amplifiers are not capable enough of … [Read more...]
What is a Single Tuned Amplifier : Working & Its Applications
Tuned amplifiers are mainly preferred to amplify the high-frequency signals in wireless communication. The tuned amplification works based on the tuning circuit implied as load. The range of the frequencies defined for a particular amplification circuit can be fixed or dynamic based on applications. The tuning circuit present at the load consists of an inductor and capacitor. For dynamic frequencies, the values of capacitance should be varied. These amplifiers are very advantageous due to its … [Read more...]
What is an Instrumentation Amplifier : Circuit and Its Working
Instrumentation Amplifier is the basic amplifier and the designing of this can be done based on the requirement in different applications. For example, measurement of temperature or it might be humidity for the industrial applications. These measurements must be converted in terms of signals that are in electrical form. Finally, this signal must be provided as the input to this amplifier so that the amplification of the signals can be obtained. The main intention of this amplifier is to … [Read more...]
Summing Amplifier its Output Voltage Calculation and Applications
Summing amplifier, as the name goes it sums up the multiple inputs and provides a single output. At the input side, the inputs applied consists of multiple signals that is connected parallelly. This type of amplification circuit can be designed based on inverting or an non-inverting amplifiers. The single output from a summing amplifier can be determined by using the concept of the ohms law. Multiple input signals applied consists of resistors attached before it is connected to the … [Read more...]
Push-Pull Amplifiers Circuit Diagram, Working and Applications
Push-pull amplifiers are the combinations of two bipolar junction transistors that is one of P-N-P type and the other is of N-P-N type. In this combination one act as push type and the other acts as pull type. If the single-stage amplifiers are utilized lot of heat dissipation occurs in the circuit and so the efficiency is less though it gives 90% amplification of the input signal. But where the higher values of efficiency are concerned then these amplifiers with two stages are utilized. One … [Read more...]
Audio Amplifier Circuit, Working, and Applications
Audio amplifier is the basic circuit configuration that is required to amplify, the audio signal received through a device like a microphone or the audio signal that is to be transmitted out through a speaker/ Radio device/Wireless transmitter etc. In early stages, in the year around 1912 vaccum tubes where used for audio amplification but at around 1970s it was replaced by BJT and MOSFETS. ClassD power amplifiers (which uses transistors/MOSFETS) are the most widely in audio amplification. … [Read more...]
Amplifier – Construction, Working, Types, and Applications
An amplifier can be considered as the basic electronic device. These amplifiers do exist in various types. Based on the operations performed in various modes and the types of configurations used the amplifiers are classified. The basic operation of these devices is to enhance and increase the strength of the applied input signal. Amplifiers can be classified under various categories it may be an operational amplifier, small-signal strength, and large-signal or power amplifiers. These devices … [Read more...]