What is the function of detector circuit?

In radio, a detector is a device or circuit that extracts information from a modulated radio frequency current or voltage.

How does a diode envelope detector function?

A Diode Detector is the simplest way of demodulating AM signals. It operates by detecting the envelope of the incoming signal which it does by rectifying the signal. Current is allowed to flow through the diode in only one direction, giving either the positive or negative half of the envelope at the output.

Is envelope detector and diode detector same?

Envelope detector is used to detect (demodulate) high level AM wave. Hence, the envelope detector is also called as the diode detector. The low pass filter contains a parallel combination of the resistor and the capacitor.

What are the two functions of AM detector?

The AM diode detector is an envelope detector – it provides an output of the envelope of the signal. As such the diode detector or demodulator is able to provide an output proportional to the amplitude of the envelope of the amplitude modulated signal.

Which diode is used in envelope detector?

In many instances Schottky diodes are used for this form of detector, because signal levels may be low, and Schottky diodes have a much lower turn on voltage (typically around 0.2 V) than standard silicon diodes (typically around 0.7 or 0.7 V).

What is the functionality of the envelope detector Mcq?

This set of Analog Communications Multiple Choice Questions & Answers (MCQs) focuses on “Envelope Detector”. Explanation: An envelope detector is used to demodulate a previously modulated signal by removing all high frequency components of the signal. Envelope detectors are asynchronous in nature.

Why a low-pass filter circuit is required for an envelope detector?

It consists of two main elements: Diode / rectifier – serves to pass one half of the received signal over the other. Low pass filter – required to remove the high frequency content that remains in the signal after detection / demodulation.

What are the distortion in envelope detector?

This distortion occurs due to a fact that the modulation index on the output side of the detector is higher than that on its input side . Hence, at higher depth of modulation of the transmitted signal, the overmodulation may takes place at the output of the detector .

Why do envelope detectors add distortion?

If you are using an envelope detector, the case of demodulating SSB-AM is different to DSB-AM. In the case of SSB-AM with sine wave modulation, the effect of the carrier vector, and just one rotating sideband vector is that the envelope of the wave is not directly proportional to the modulating signal, it is distorted.

Why is the envelope detector used in the receivers of digital communication systems?

The receiver for this type of AM is an envelope receiver, which basically detects the message by finding the envelope of the received signal. The advantage of adding the carrier to the message, which allows the use of a simple envelope detector, comes at the expense of increasing the power in the transmitted signal.