Table of Contents
What is the need of amplifier?
An electronic amplifier is a device that is used to increase the power, current, or voltage of a signal. Amplifiers are used in music equipment, electronic devices such as television and radio receivers, audio equipment, and computers to increase the amplitude of a signal.
Why do we require multistage cascading?
The overall reason for cascading amplifiers is the need for an increase in amplifier output to meet a specific requirement, e.g., to increase the signal strength in a Television or radio receiver. Using a cascade, or multistage, amplifier can provide your design with a higher current gain or voltage gain.
What do you mean by multistage amplifier?
MULTISTAGE AMPLIFIERS. Definition: An amplifier formed by connecting several amplifiers in cascaded arrangement such that output of one amplifier becomes the input of other whose output becomes input of next and so on . Each amplifier in this configuration is known as stage.
What are the classification of multistage amplifier?
Depending upon the type of coupling, the multistage amplifiers are classified as: 1. Resistance and Capacitance Coupled Amplifiers (RC Coupled) 2. Transformer Coupled Amplifiers 3.
How does a multistage amplifier work?
In Multi-stage amplifiers, the output of first stage is coupled to the input of next stage using a coupling device. These coupling devices can usually be a capacitor or a transformer. This process of joining two amplifier stages using a coupling device can be called as Cascading.
Which of the multistage amplifiers has poor frequency response?
This set of Electronic Devices and Circuits Multiple Choice Questions & Answers (MCQs) focuses on “Multistage Amplifier”. Explanation: The transformer coupling has a poor frequency response. The gain varies considerably with frequency.
How do I check bandwidth of multistage amplifier?
It is the frequency for which the overall gain falls to 1/√2 (3dB) of its midband value. In multistage amplifier fL(n) is always greater than fL and fH(n) is always less than fH. So the bandwidth of multistage amplifier is always less than single stage amplifier.
What are the 4 types of amplifiers?
different types of amplifiers are also often described in system or block diagrams by name.
- Amplifier.
- Audio Frequency Amplifier.
- Intermediate Frequency Amplifier.
- R.F. Amplifier.
- Ultrasonic Amplifier.
- Operational Amplifier.
How is a single stage amplifier replaced by a multi stage amplifier?
In practical applications, the output of a single state amplifier is usually insufficient, though it is a voltage or power amplifier. Hence they are replaced by Multi-stage transistor amplifiers. In Multi-stage amplifiers, the output of first stage is coupled to the input of next stage using a coupling device.
What is the advantage and disadvantages in multistage amplifier?
To answer your question, one advantage of a multistage amplifier is high bandwidth. For example, suppose we wanted an amplifier with a gain of 500 at a frequency of 50 kHz. Clearly, a single OPA1688 will fail as shown in the proceeding paragraph.
How is cascade used in a multi stage amplifier?
Joining one amplifier stage with the other in cascade, using coupling devices form a Multi-stage amplifier circuit. There are four basic methods of coupling, using these coupling devices such as resistors, capacitors, transformers etc. Let us have an idea about them.
When to use direct coupling in an amplifier?
The individual amplifier stage bias conditions are so designed that the stages can be directly connected without DC isolation. The direct coupling method is mostly used when the load is connected in series, with the output terminal of the active circuit element. For example, head-phones, loud speakers etc.