Synchronous detector

In electronics, a synchronous detector is a device that recovers information from a modulated signal by mixing the signal with a replica of the un-modulated carrier. ... Synchronous detection preserves any phase information originally present in the modulating signal.

1. Can you detect AM using synchronous detector?
2. Is envelope detector a synchronous detector?
3. Which is a feature of the Synchronous detection of AM signal?
4. Why the synchronous coherent detection of AM signals is considered as a disadvantage?
5. What is FM and PM?
6. How does a synchronous detector work?
7. What is diode detector?
8. How does an envelope detector work?
9. Can we use envelope detector for SSB demodulation?
10. What is the use of SSB?
11. What is the advantage of synchronous detection?
12. What is the disadvantage of FM over AM?
13. What is the basic component in a synchronous detector?
14. What is frequency deviation in FM?
15. What are the advantages of AM over FM signal?

Can you detect AM using synchronous detector?

Explanation: Synchronous detection of AM signal requires local generation of the carrier signal at the receiver. ... And the phase of the locally generated carrier must be synchronized to that of transmitted carrier otherwise the detected signal would get distorted.

Is envelope detector a synchronous detector?

An envelope detector introduces distortion that is avoided with a synchronous detector. ... From the synchronous demodulator M2, the signal is low-pass filtered to remove the carrier and harmonics, and supplied to S2, the switch that selects either the envelope or synchronous detectors.

Which is a feature of the Synchronous detection of AM signal?

Explanation: In synchronous detection of AM signal, the carrier signal is locally generated and then passed through a low pass filter. At the output of the low pass filter, the original modulating signal is recovered. The synchronous detection requires the generation of carrier at the receiver also.

Why the synchronous coherent detection of AM signals is considered as a disadvantage?

Why the Synchronous detection of AM signals is considered as a disadvantage? Explanation: Disadvantage of synchronous detection of AM signal are that it needs an additional system for generation of carrier. It also needs additional system for synchronization of carrier. Moreover receiver is complex and costly.

What is FM and PM?

Frequency Modulation is widely used. Phase Modulation is used in mobile system. 8. In FM, the frequency derivation is proportional to the modulating voltage only. In PM, the frequency derivation is proportional to the modulating voltage as well as modulating frequency.

How does a synchronous detector work?

In electronics, a synchronous detector is a device that recovers information from a modulated signal by mixing the signal with a replica of the un-modulated carrier. This can be locally generated at the receiver using a phase-locked loop or other techniques.

What is diode detector?

The diode detector is the simplest and most basic form of amplitude modulation, AM signal detector and it detects the envelope of the AM signal. The AM diode detector can be built from just a diode and a few other components and as a result it is a very low cost circuit block within an overall receiver.

How does an envelope detector work?

An envelope detector (sometimes called a peak detector) is an electronic circuit that takes a (relatively) high-frequency amplitude modulated signal as input and provides an output, which is the demodulated envelope of the original signal.

Can we use envelope detector for SSB demodulation?

yes you can demodulate a DSB-SC signal using an envelope detector but with carrier reinsertion. Non-coherent detection process doesn't need receiver to be phase locked with transmitted carrier.

What is the use of SSB?

In radio communications, single-sideband modulation (SSB) or single-sideband suppressed-carrier modulation (SSB-SC) is a type of modulation used to transmit information, such as an audio signal, by radio waves. A refinement of amplitude modulation, it uses transmitter power and bandwidth more efficiently.

What is the advantage of synchronous detection?

Whatever method of synchronous detection is used, it provides some significant advantages over a diode envelope detector in terms of reduced distortion, increased immunity to selective fading, and low signal performance.

What is the disadvantage of FM over AM?

Explanation: The disadvantage of FM over AM is that in frequency modulation large bandwidth is required. While, in case of advantages, FM is less prone to noise interference and has lower power consumption compared to AM. ... In FM receiver, role of amplitude limiter is to amplify low frequency signals.

What is the basic component in a synchronous detector?

A synchronous detector consists of a reference value mixed (multiplied) with a specific modulation frequency to generate a modulated stimulus signal that is fed to the system under test (SUT) (Fig. 1). The SUT output is again mixed with the same modulation frequency.

What is frequency deviation in FM?

From Wikipedia, the free encyclopedia. Frequency deviation ( ) is used in FM radio to describe the difference between the minimum or maximum extent of a frequency modulated signal, and the nominal center or carrier frequency.

What are the advantages of AM over FM signal?

Pros and Cons of AM vs. FM. The advantages of AM radio are that it is relatively easy to detect with simple equipment, even if the signal is not very strong. The other advantage is that it has a narrower bandwidth than FM, and wider coverage compared with FM radio.