What is the function of a phase comparator?

What is the function of a phase comparator?

A phase detector or phase comparator is a frequency mixer, analog multiplier or logic circuit that generates a signal which represents the difference in phase between two signal inputs.

What are the advantages of edge triggered phase detector over the exclusive or type phase detector?

Edge Triggered Phase Detector: Advantages of Edge Triggered Phase Detector over Ex-OR are Page 4 i) The dc output voltage is linear over 2Π radians or 360 degrees, but in Ex-OR it is Π radians or 180 degrees. ii) Better Capture, tracking & locking characteristics.

What is the basic function of phase detector?

A phase detector is a mixer-like circuit that puts out a signal that is proportional to the phase difference between two input signals of the same frequency.

What are the types of phase detector?

There are two classes of phase detectors: a linear phase detector, in which the transfer function is somewhat linear between the output and the input phase error, as shown in Figure 4.41(A), and a binary phase detector (or bang-bang phase detector), in which only the sign of the phase error is extracted, as shown in …

How an amplitude comparator can be converted to a phase comparator and vice versa?

It can be shown with the help of phasor diagrams that an inherent amplitude comparator becomes a phase comparator and vice-versa if the input quantities to the comparator are changed to the sum and difference of the original two input quantities.

What is compared in the phase comparator?

In this arrangement an input AC signal is compared in phase with the output from a voltage controlled oscillator (VCO). The output from the phase comparator will be the sum and difference frequencies of the input and VCO signals.

How does phase frequency detector work?

PFD (Phase Frequency Detector) is a circuit that measures the phase and frequency difference between two signals, i.e. the signal that comes from the VCO and the reference signal. PFD has two outputs UP and DOWN which are signaled according to the phase and frequency difference of the input signals.

What is phase detector gain?

Phase detector: compares the phase at each input and generates an error signal, ve(t), proportional to the phase difference between the two inputs. KD is the gain of the phase detector (V/rad). Any phase difference then shows up as the control voltage to the VCO, a DC or slowly varying AC signal after filtering.

What is meant by phase comparator?

[′fāz kəm‚par·əd·ər] (computer science) A comparator that accepts two radio-frequency input signals of the same frequency and provides two video outputs which are proportional, respectively, to the sine and cosine of the phase difference between the two inputs.

How can amplitude comparator be converted to phase comparator?

What is meant by amplitude comparator explain the duality between amplitude comparator and phase comparator?

Duality Between Amplitude and Phase Comparators: Equations (4.4) and (4.6) represent the general operating characteristics of the relays using the amplitude and phase comparators respectively. Similarly, a phase comparator working with inputs A and B, operates when A and B have same directional sense.

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.

How are comparators used in amplitude and phase comparison?

In amplitude comparison technique, the comparator produces an output whose amplitude is proportional to the amplitude difference of the input quantities; while in phase comparison technique, the comparator compares the phase angles of the input quantities and produces pulses whose width is proportional

How are sampling comparators used in Electrical Engineering?

Sampling Comparators: Sometimes it is convenient to obtain the required characteristics by comparing the amplitude of one input signal at a certain point on its wave with the rectified and smoothened value of the second signal.

Which is a phase comparator in electromechanical relays?

It is to be noted that the phase comparator in case of static circuits is a cosine comparator as opposed to a sine comparator in case of electromechanical relays. The amplitude comparison using a phase comparator is explained with the help of phasor diagram shown in Fig. 3.5.

How are amplitude comparators used in Static relays?

The input quantities to static relays are either in the form of sinusoidal current derived from main CT or sinusoidal voltage derived from PT. CT or PT provides analogous output, faithful to the main circuit quantities. It is possible to arrange rectifier bridge networks as amplitude comparators.