What is PLL in software?
A phase-locked loop or phase lock loop (PLL) is a control system that generates an output signal whose phase is related to the phase of an input signal. Phase-locked loops are widely employed in radio, telecommunications, computers and other electronic applications.
What is the concept behind PLL?
The phase-locked loop (PLL) block is a feedback control system that automatically adjusts the phase of a locally generated signal to match the phase of an input signal. PLLs operate by producing an oscillator frequency to match the frequency of an input signal.
What are the applications of PLL?
Applications of Phase-Locked Loop
- FM demodulation networks for FM operations.
- It is used in motor speed controls and tracking filters.
- It is used in frequency shifting decodes for demodulation carrier frequencies.
- It is used in time to digital converters.
- It is used for Jitter reduction, skew suppression, clock recovery.
How is PLL frequency calculated?
Therefore, FOUT = (FREF/R) × (BP + A), as in Figure 4. There are many specifications to consider when designing a PLL. The input RF frequency range and the channel spacing determine the value of the R and N counter and the prescaler parameters. The loop bandwidth determines the frequency and phase lock time.
What is PLL synthesized digital tuning?
A phase locked loop (PLL) frequency synthesized tuning system is the best answer for the reccent demands, that is, tuning accuracy, stability, easiness of operation and easiness of function expansion.
What is free running frequency of PLL?
To understand the operation of PLL circuit, initially no input signal is applied. Under this condition, phase detector and Low pass filter outputs will be zero. At this time, VCO operates at free running frequency.
When a PLL is locked on the input frequency the VCO frequency?
This means that the VCO frequency will change until it is equal to the input reference signal frequency. When this happens, the two signals are synchronized or “locked.” The phase difference causes the phase detector to produce the DC voltage at the VCO input to keep the PLL locked to the input signal.
Is PLL analog or digital?
At its core, the PLL is analogue. It uses an analogue voltage-controlled oscillator whose output frequency is proportional to an input voltage.
What is PLL in PCIE?
The PLL bandwidth test is essentially a jitter transfer function measurement, intended to check that the -3dB point of the DUT’s jitter transfer function is within an acceptable frequency range and that the jitter transfer function does not exhibit excessive peaking. …
What is maximum free running frequency of VCO for PLL 565?
The PLL IC 565 is usable over the frequency range 0.1 Hz to 500 kHz. It has highly stable centre frequency and is able to achieve a very linear FM detection. The output of VCO is capable of producing TTL compatible square wave.
When was PLL invented?
1932
The phase locked loop (PLL) has its roots in receiver design. It was invented in 1932 as a technique for stabilizing an oscillator’s frequency. 1 The PLL was then adapted for use in television receivers, synchronizing the vertical and horizontal sweep circuits to the incoming video signal.