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 ?
Tenders invited for Phase locked loop evaluation kit
Pasternack, a leading provider of RF, microwave and millimetre wave products, has unveiled a new line of phase locked oscillators (PLO) that deliver accurate and stable output frequencies with low phase noise and spurious performance, making them ideal for use in radar and other exciter or frequency generation applications.
Liu, "Design of local clock source of satellite borne spectrometer based on digital phase locked loop," Journal of Electronics and Information Technology, vol.
A phase locked loop (PLL) architecture has two types, a Fractional-N PLL (FNPLL) and an integer-N PLL [5].
Frequency acquisition techniques for phase locked loop.
According to the agreement, RFMW will stock, distribute and provide applications engineering support for Peregrine Semiconductor's broad product portfolio, including RF switches, digital step attenuators, prescalers, mixers, Phase Locked Loop frequency synthesizers, and digitally tunable capacitors.
Internal RF connections are completely shielded and can be phase locked to an external reference.
Each circuit will contain both phase locked loop (PLL) and voltage controlled oscillator (VCO) functions which will reportedly reduce the board space required by 67% when compared to similar systems that use separate PLL and VCO circuits.
This first demonstration of an optical clock with a microwave output, reported in the August 3 issue of Science, involves an optical frequency standard coupled to a new optical-frequency synthesizer that bridges an octave in the optical spectrum and provides for a direct microwave output that is phase locked to the optical standard.
To minimise the delay, jitter, echo and data loss occurring when different types of packet-based and circuit-switched traffic converge onto the network infrastructure, the chip incorporates a phase locked loop that optimises system timing and synchronisation.
The 2 measures of 40-Hz EEG analyzed were (a) evoked 40 Hz, which is phase locked to stimulus onset, and (b) induced 40 Hz, which is not phase locked to the stimulus.
Tenders are invited for Phase Locked Dielectric Resonator , Qty 6 No