- What is a diode detector?
- What is the difference between detector and demodulator?
- How can we use an envelope detector to demodulate Dsbsc signals?
- How can you detect the negative peaks of input signals in the peak detector given below?
- Which factor makes the differentiator circuit unstable?
- What is the function of a rectifier?
- How does Comparator get high rate of accuracy?
- What is meant by detector?
- What is the use of precision rectifier?
- How does a crystal detector work?
- What is inside a rectifier?
- What is a zero crossing detector?
- How does sample and hold circuit work?
- Why is it called synchronous detector?
- How do you make a zero crossing detector?
- What is characteristics of diode?
- What is a detector circuit?
- How does an AM detector work?
- How does a clamper circuit work?
- What is a power detector?
- What is the use of zero crossing detector?
- What is peak detector op amp?
- How does a diode detector function?
- What are the objectives met by modulation?
- What is UTP and LTP?
- What is peak rectifier?
- Why is it called precision rectifier?
- What are the two basic types of RF modulation?
What is a 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..
What is the difference between detector and demodulator?
3 replies. A detector may be a device that recovers data of interest contained in a very modulated wave. Demodulation is up up to now type of detector, reception is that the act of extracting the first information-bearing signal from a modulated carrier.
How can we use an envelope detector to demodulate Dsbsc signals?
This sinewave is generated by the receiver and is known as the local carrier. Experiment AM Modulation shows how the envelope detector can be used to recover the original message from an AM signal i.e., demodulate it. Unfortunately, the envelope detector cannot be used to demodulate a DSBSC signal.
How can you detect the negative peaks of input signals in the peak detector given below?
Explanation: The negative peaks of the input signal Vin can be detected by reversing diodes D1 and D2. Explanation: The time periods of the sample and hold control voltage during which the voltage across capacitor is equal to the input voltage are called sample period. 10.
Which factor makes the differentiator circuit unstable?
which factor makes the differentiator circuit unstable? Explanation: The gain of the differentiator circuit (RF / XC1) increases with increase in frequency at a rate of 20dB/decade. This makes the circuit unstable.
What is the function of a rectifier?
A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. The process is known as rectification, since it “straightens” the direction of current.
How does Comparator get high rate of accuracy?
How to obtain high rate of accuracy in comparator? Explanation: High voltage gain causes comparator output voltage to switch between saturation levels. High CMRR rejects noise at input terminal and input offset (voltage & current) help to keep changes in temperature variation very slight.
What is meant by detector?
: one that detects: such as. a : a device for detecting the presence of electromagnetic waves or of radioactivity. b : a rectifier of high-frequency current used especially for extracting the intelligence from a radio signal.
What is the use of precision rectifier?
With a little modification, the basic precision rectifier can be used for detecting signal level peaks. In the following circuit, a capacitor retains the peak voltage level of the signal, and a switch is used for resetting the detected level.
How does a crystal detector work?
A crystal detector is an obsolete electronic component used in some early 20th century radio receivers that consists of a piece of crystalline mineral which rectifies the alternating current radio signal and was employed as a detector (demodulator) to extract the audio modulation to produce the sound in the earphones.
What is inside a rectifier?
The rectifier circuit, which is typically made from a set of cleverly interlocked diodes, converts alternating current to direct current. … If you place a diode in series with an alternating current voltage, you eliminate the negative side of the voltage cycle, so you end up with just positive voltage.
What is a zero crossing detector?
A zero-crossing detector or ZCD is one type of voltage comparator, used to detect a sine waveform transition from positive and negative, that coincides when the i/p crosses the zero voltage condition. … The applications of the Zero Crossing Detector are phase meter and time marker generator.
How does sample and hold circuit work?
In electronics, a sample and hold (also known as sample and follow) circuit is an analog device that samples (captures, takes) the voltage of a continuously varying analog signal and holds (locks, freezes) its value at a constant level for a specified minimum period of time.
Why is it called 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. …
How do you make a zero crossing detector?
Zero-crossing Detector Using IC 311 and Transistor A 20 kiloohm load resistor is connected to the output of the transistor. For a positive input signal, that is, for an input sine wave above 0 volt, the output of the op-amp sets the transistor OFF, and the output of the transistor goes HIGH.
What is characteristics of diode?
Electrical Characteristics of Diodes Basic static characteristics of diodes are the forward voltage VF and forward current IF, and the reverse voltage and current VR and IR.
What is a detector circuit?
In radio, a detector is a device or circuit that extracts information from a modulated radio frequency current or voltage. … This is its current meaning, although modern detectors usually consist of semiconductor diodes, transistors, or integrated circuits.
How does an AM detector work?
The detection of AM radio signals is a diode application. The modulated AM carrier wave is received by the antenna of the radio receiver and is rectified by the action of a detector diode. … The signal frequency which modulates it is much lower, 0.02 to 5 kHz, and it can pass through the filter.
How does a clamper circuit work?
A clamper circuit shifts the DC level or the reference level of the signal to the desired level without changing the shape of the waveform. … Some times the biasing voltage is also added with the clamper circuit to shift the DC level to the desired voltage level.
What is a power detector?
MACOM’s power detectors are broadband devices that have integrated low loss directional couplers and built-in temperature compensation circuits. These detectors provide an easy way to monitor the power of a signal travelling in a specific direction along a transmission line.
What is the use of zero crossing detector?
A zero-crossing detector is used to generate a sync pulse related to the AC voltage phase angle often used in power control circuits. Fig. 1 shows the relationship of a zero-crossing pulse to a sine wave. The pulse occurs at 0, 180, and 360 degrees.
What is peak detector op amp?
Op-amp based peak detector circuit is the modification of basic peak detector circuit, used to remove the voltage drop across the diode. Whenever the applied input voltage signal is greater than the threshold voltage of the diode, the diode will get forward biased and acts as a closed switch.
How does a diode 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.
What are the objectives met by modulation?
What are the objectives met by modulation? Ans: Length of antenna is shortened, signal loss is reduced, ease of radiation, adjustment of bandwidth, shifting signal frequency of the assigned value.
What is UTP and LTP?
The UTP and LTP in Schmitt trigger using op-amp 741 are nothing but UTP stands for upper trigger point, whereas LTP stands for the lower trigger point. Hysteresis can be defined as when the input is higher than a certain chosen threshold (UTP), the output is low. … This dual threshold action is called hysteresis.
What is peak rectifier?
Chapter 3 – Diodes and Rectifiers A peak detector is a series connection of a diode and a capacitor outputting a DC voltage equal to the peak value of the applied AC signal.
Why is it called precision rectifier?
Precision rectifiers use op amp based circuits whereas ordinary rectifiers use simple diodes. The advantages of precision rectifiers are: No diode voltage drop (usually 0.7) between input and output. … Precision rectifier is a close approximation of an ideal diode because of absence of forward voltage drop.
What are the two basic types of RF modulation?
The two forms of modulation that fall into the angle modulation category are frequency modulation and phase modulation.