answersLogoWhite

0

Once the PLL is in lock, what is the input (or VCO) frequency range for which it can keep itself locked is the lock range. When the PLL is initially not in lock, what frequency range can make the PLL lock is the capture range. Lock range is the parameter you should be interested in if you are looking for it's tracking behavior. But in CP PLLs, both the lock and capture ranges are the same.., limited only by the VCO's tuning range.

In modern PLLs capture range and lock range are the same. But by definition these are different and this relaxed usage in journals and books leads to these confusions.
Capture range and pull-in range are the same. Both refer to the ability of the system to acquire lock (from an unlocked state) to a frequency. Here the VCO is running at some arbitrary frequency and the disturbance required at the input to make it respond to the input disturbances thereafter is quantified as capture range.
While the VCO is responding to the input disturbance (in-lock), the amount of disturbance at the input that will cause the VCO to shun the input and run freely is quantified as lock range.
Always lock range is equal to or greater than the capture range.

Definitions from the web
Lock range is defined as the band of frequencies centered on the VCO's natural frequency over which a PLL can maintain frequency lock with an external input signal.

Capture range is defined as the band of frequencies centered around the VCO natural frequency where the PLL can initially establish or acquire frequency lock with an external input signal from an unlocked condition.

User Avatar

Wiki User

11y ago

What else can I help you with?

Continue Learning about Engineering

How you determine the starting and running winding of a capacitor start single phase motor?

I think the resistance value of starting winding is less than the running winding of the single phase motor


What is the advantage of polyphase system over single-phase system?

1) less copper cross section to conduct current2) constant power to load3) constant rotating magnetic field4) Ideal for Direction Reversing5) Current is not zero at any constant..


What are the uses of three phase transformer over single phase and their losses?

For a given load, a three-phase system requires around 75% of the volume of copper required by a corresponding single-phase system and, so, is more economical. A three-phase supply also delivers power more or less continuously, whereas a single-phase supply delivers power in pulses. Finally, three-phase motors are self-starting and physically smaller than single-phase machines of the same power rating.


What are the disadvantages of a three phase induction motor?

The primary disadvantage of the three phase induction motor is that speed control is a challenge. But new technology in the form of VFDs (variable speed drives) is now rectifying this situation very effectively. Another disadvantage is that single phase power is common while three phase power is less commonly available.


Will your power bill be cheaper using 3 phase than single phase power?

Yes that is why most factories or business that use motors, utilize 3 phase service. There also is much less current draw relating to expense in electricity rates. As a general rule, 3 phase devices use less electricity relating to current usage.

Related Questions

How do you capture a Jaguar in Maplestory?

get the jaguars hp to 50% or less then go to beginner skill and there should be a skill called capture and then you capture it when its at 50% or less


Do fantail goldfish sleep?

they go into a resting phase which is a phase where they use less energy


What phase is the moon in when less and less of the side facing the earth is lighted?

The moon is in its waning phase when less and less of the side facing the earth is lighted. This phase occurs after the full moon and leads up to the new moon when the side facing the earth is completely dark.


What is the advantages and disadvantages of single phase and three phase?

Single phase inherently requires less equipment (it's cheaper). Three phase motors are more efficient than single phase.


How can you open a key less car door?

if the car is locked no if its unlocked yes


When Locked doors are less likely to open in a crash and?

Decreasing the chance ot the


When are locked doors less likely to open in a crash?

Decreasing the chance ot the


When sound travels in gas is it more dense or less dense?

The gas phase is less dense than the liquid or solid phase of a substance. Density is not a property of sound.


What is the moon when less and less of it is visible?

When less and less of the moon is visible, it is transitioning from a full moon to a new moon. This phase is known as the waning gibbous phase, followed by the third quarter, waning crescent, and finally the new moon.


Can the range be zero?

can the median be less than the range


Why don't have 2phase supply?

Two-phase supplies, in which the phase voltages are displaced from each other by 90 degrees, are less economical than three-phase systems.


What is river capture?

River capture is the diversion of some water or parts of a less powerful river into a more powerful river in the adjacent valley.