PLL


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PLL

(electronics)

PLL

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.
References in periodicals archive ?
The prototype PLL hardware that we developed in our laboratory is shown in Fig.
A study [12] evaluating CD11c+ CD5+ chronic B-cell leukemias found that these represent forms of either CLL or PLL rather than HCL.
The MOSAID Maestro family of PLLs includes delta-sigma fractional-N PLL IP products with an ideal combination of true fractional frequency multiplication and low power, making them ideal for portable electronic, consumer and networking applications.
PLL phase noise figure of merit: -223 dBc/Hz, an improvement of 3 dB improvement over the ADF4153
All three new PLL synthesizers are available in 16-pin plastic TSSOP and 16-pad plastic BCC packages.
The ADF4151 PLL synthesizer is well-suited to work with ADI's ADL5801 and ADL5802 RF mixers and is complementary to the ADF4350 and ADF4351 PLL synthesizers.
com features National's WEBENCH(TM) - Easy PLL, an interactive simulation tool, the online design environment that enables engineers to design and simulate PLL and loop filter circuit designs.
The PLL consists of a low noise digital phase frequency detector (PFD), a precision charge pump, programmable A, B, and R counters and a dual modulus prescaler (P/P+1).
Coverage provided by PLL MuniProtectand PLL REAL Protectenhances the Chartis insurers' market- leading Pollution Legal Liability (PLL) insurance products.
We are accordingly delighted to licence our Lithium Ion technology to PLL because of their dynamic plans and aggressive approach to the Lithium Ion battery market.
Meanwhile, in advance of the merger, LTC and PLL are continuing to work closely together in commercializing LTC's lithium polymer cell technology, pursuing specific market opportunities for LTC's large footprint cells, expanding PLL's lithium materials production capabilities, and considering additional strategic alliances.
or Canada-based multinational companies to facilitate purchasing locally admitted PLL insurance to cover international operations and subsidiaries.