PLL


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PLL

(electronics)
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

PLL

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PLL

(Phase-Locked Loop) An electronic circuit that compares an input frequency and phase to a reference signal. It then generates a voltage proportional to the difference between the input and the reference. PLLs are used in myriad digital and mixed mode (analog and digital) applications as regulators, demodulators, synchronizers and frequency multipliers and dividers. For example, in a superheterodyne FM radio, a PLL is used to lock the local oscillator to an accurate frequency reference such as a crystal or ceramic resonator. It can also be used to demodulate the FM audio and stereo subcarrier signals from the intermediate frequency (IF) stage. See heterodyning.


PLLs in an FM Radio
This example shows how PLLs are used for regulation and demodulation in an FM radio tuned to 101.5 MHz. The FM frequency range is 88-108 MHz, and this example uses a 10.7 MHz intermediate frequency (IF) and a 1 MHz reference frequency.
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References in periodicals archive ?
In synchronous operation (0 ppm offset), the total jitter is dominated by the random jitter of a standalone PLL, which in turn depends on the noise contribution of the blocks within the PLL, as well as the PLL dynamics.
Ald-dex/PLL hydrogel was formed by Schiff base formation between oxidized and aldehyded dextran and PLL [14].
At the local level, the PLL reentry model was used as an overlay blueprint to organize and bring the various reentry systems together.
'How such a person is sitting as the PLL MD in our government,' he asked.
Her role as Mona Vanderwaal made her the ultimate villain on "PLL" and Parrish was tapped to reprise the shady character in the "PLL" spin-off, "Pretty Little Liars: The Perfectionists." Aside from her "PLL" gigs, the actress has appeared in several Broadway productions and films.
The main influence of gain [K.sub.SOGI] is hook time of PLL, on the other hand high gain decrease SOGI-PLL filtering effect.
Following the agreement, they said Pakistan had nominated Pakistan State Oil Company Limited (PSOCL), Pakistan LNG Limited (PLL), Pakistan LNG Terminal Limited (PLTL), Oil and Gas Development Company Limited (OGDCL), Pakistan Petroleum Limited (PPL) for negotiating sale and purchase agreement for petroleum products, LNG supply and establishment of LNG terminals.
Following the agreement, the sources said, Pakistan had nominated the PSO, PLL, Pakistan LNG Terminal Limited (PLTL), Oil and Gas Development Company Limited (OGDCL), Pakistan Petroleum Limited (PPL) for negotiating the sale and purchase agreement for petroleum products, LNG supply and establishment of LNG terminals.
Generally, the function of PLL in GNSS receivers is to try to reduce the phase difference between the incoming carrier and local generated carrier.
They reflect the main ways to turn on the DDS in the PLL loop: as a reference PLL oscillator (Figure 3), a frequency divider in the feedback loop (Figure 4) and a support oscillator of the PLL (Figure 5).
Given that slight changes to the coating and size of AuNPs might elicit different immune responses, we employed an in vivo-like method that is rapid, reliable, and cheap to investigate the interaction of the phagocytes, particularly neutrophils, with various charged polymer-capped AuNPs, namely, with cationic poly(L-lysine) (PLL) dendrigraft, slightly negative poly(vinyl alcohol) (PVA), and nearly neutral poly(ethylene glycol) (PEG) coats with the aim of strengthening our knowledge on charged AuNPs and their effect on immune cells.