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PLL frequency synthesizers are electronic devices that produce frequencies coherent to a reference frequency. They use phase-locked loops (PLLs), electronic circuits that consist of a phase/frequency detector (PFD), low pass filter, and voltage-controlled oscillator (VCO). PLL frequency synthesizers use the PFD to compare a feedback frequency with a divided-down version of the reference frequency. Integral PLL frequency synthesizers divide the output frequency by an integer. Fractional PLL frequency synthesizers divide the output frequency by a non-integer. With both types of devices, the PFD’s output (current pulses) are filtered and integrated to generate a voltage. In turn, this voltage drives the VCO to increase or decrease the output frequency, moving the PFD’s average output towards zero. Sensitivity varies over the full VCO frequency range. Input reference counters are used to reduce the reference input frequency. Feedback counters are used to reduce the output frequency for comparison with the scaled reference frequency. Applications for PLL frequency synthesizers include wireless base stations, mobile hand sets, personal digital assistants (PDAs), broadband wireless access, satellite communications, and local area networks (LANs).

Selecting PLL frequency synthesizers requires an analysis of performance specifications such as frequency range, step size, settling time, output power, and voltage standing wave ratio (VSWR) vs. return loss. Frequency range is the range of frequencies that PLL frequency synthesizers can generate. Step size is the minimum output frequency that devices can achieve. Settling time is the maximum amount of time needed for the output signal to reach its final, stable state. Output power is usually measured in decibels per meter (dBm) for a 50 W load. Additional considerations include phase noise, reference spurs, and lock time. Phase noise is the ratio of the carrier power to the power found in a 1 Hz bandwidth at a defined frequency, usually 1 kHz. Reference spurs are artifacts at discrete offset frequencies generated by internal counters and charge pump operation at the PFD frequency. Lock time is the time needed to jump from one specified frequency to another specified frequency within a given frequency tolerance.  


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Engineering Web: PLL Frequency Synthesizers
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PLL Frequency Synthesizers
PLL Frequency Synthesizers. Index of companies supplying: PLL Frequency Synthesizers. Promote your company here.   Admiral Microwaves Ltd - Ruislip. Admiral Microwaves Ltd - Ruislip. Results for this ...
PLL Frequency Synthesizers Search : FUJITSU
PLL Frequency Synthesizers Search. You can search Fujitsu PLL Frequency Synthesizers products having specifications that you specify.. Please select following specifications, and click button [ Search ...
3. PLL Frequency Synthesizer -- 39. RF?????IC
PHILIPS ???????. 39. PLL Frequency Synthesizer, Sync Generators & Strippers ?????????. PDF?¼ -- ???? ?????????? -- Description. FORNT-END AND PLL SYNTHESIZERS FOR CAR RADIOS. Pins/Package. 4OP/SOP. ...
Pll Pll Frequency Synthesizer
Pll Charge Pump. Pll Chip. Pll Chips. Pll Circuit. Pll Circuit Design. Pll Circuits. Pll Dll. Pll Fm Modulator. Pll Frequency Synthesizer. Pll Ic. Pll Jitter. Pll Lnb. Pll Loop Bandwidth. Pll Loop ...
RF PLL Frequency Synthesizers Data Sheet (Rev. D)
... PLL Frequency Synthesizers. ADF4116/ADF4117/ADF4118. FEATURES GENERAL DESCRIPTION ADF4116: 550 MHz The ADF411x family of frequency synthesizers can be used to ADF4117: 1.2 GHz implement local ...
See Analog Devices, Inc. Information

Part Numbers for PLL Frequency Synthesizers

Part # Distributor Manufacturer Product Category Description
Si4112   Silicon Laboratories, Inc. PLL Frequency Synthesizers Dual-band wireless communications, 62.5 MHz-1GHz, loop filter included
Si4126   Silicon Laboratories, Inc. PLL Frequency Synthesizers Dual-band wireless communications, 62.5 MHz-1GHz, loop filter included
Si4123   Silicon Laboratories, Inc. PLL Frequency Synthesizers Dual-band wireless communications, 62.5 MHz-1GHz, loop filter included
Si4113   Silicon Laboratories, Inc. PLL Frequency Synthesizers Dual-band wireless communications, 62.5 MHz-1GHz, loop filter included
Si4136   Silicon Laboratories, Inc. PLL Frequency Synthesizers Dual-band wireless communications, 2.3 GHz, loop filter included

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See more product announcements for PLL Frequency Synthesizers
Wideband Frac-N PLL Synthesizer - PSA1450F-LF

Wideband Frac-N PLL Synthesizer - PSA1450F-LF
Z-Communications, Inc.


HG7 Passive Harmonic Filter to help meet IEEE 519

HG7 Passive Harmonic Filter to help meet IEEE 519
TCI (Trans Coil, Inc.)


HIGH PERFORMANCE VCO - OA2CP12001

HIGH PERFORMANCE VCO - OA2CP12001
Teledyne Cougar, Inc.


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