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FEAT


ATURE


RADIO FREQUENCY & MICROWAVE


Microwave Synthesizer offers multioctave frequency coverage and excellent phase noise performance


By Marty Richardson, senior applications engineer, Analog Devices S


ystem frequency and modulation rate requirements cont inue to escalate with the need for more bandwidth and higher data rat es. Low power consumption has become critical as applications once relegat ed t o military and defense enter t he commercial sect or. These demands come with the caveat that there be no sacrifice of elect rical performance or functionality. In order to meet t hese requirements, including an improved signal-to-noise ratio (SNR), bit error rate (BER), and the high quality of service (QoS) that users are accustomed to, the phase noise of the local oscillator (LO) must improve as well.


The newly released ADF5610 is an integrated phase-locked loop (PLL) and voltage controlled oscillator (VCO


provide a solution that addresses each of these concerns and more. FREQUENC FREQUENCY COVERAGE


A total of eight octaves are covered by the ADF5610 with t he VCO fundamental frequency ranging from 3.65 GHz t o 7.3 GHz, which is fed back to the PLL to minimize phase noise. A single-ended output (RFOUT) doubles the fundamental frequency range t o provide 7.3 GHz to 14.6 GHz while the differential output simultaneously allows the full operating range of 57 MHz to 14.6 GHz through the use of divide by 1/2/4/8/16/32/64 and 128 settings.


Figure 2. RMS jitt er: 8.0 GHz. rolled oscillator (VCO) that highlights Analog Devices’ efforts to


Figure 3. RMS jitter: 14.4 GHz. COMMUNICATIATIONS AND INSTRUMENTAT COMMUNICA most often serve as the local oscillator. Figure 1. Block diagram of the ADF5610.


The architecture of the ADF5610 VCO allows wideband synthesizer performance while retaining industry -leading phase noise performance with a nominal open l - oop phase noise at 10 GHz of –114 dBc/Hz at a 100 kHz offset. An internal state machine allows frequency sett ling times of under 40 μ s using just a passive loop filter; no need for addit circuitry or lookup t ables (LUTs) unless faster sett ling times are required.


s using just a passive loop filter; no need for additional LM LE


While the phased-locked loop (PLL) inside of the ADF5610 boasts a modest figure of merit (FOM) of –229 dBc/Hz (–232 dBc/Hz high current mode), when combined with exceptional 1/f noise (–129 dBc/ Hz) and state-of-the-art VCO phase noise, rms jitter numbers less than 38 fs (1 kHz to 100 MHz integration limit) are possible. This he ADF5610 suitable for use in the most demanding converter clock applications. Loop filter resistor values should be kept at aclock applications. Loop filter resistor values should be kept at minimum to reduce their thermal noise and a high frequency (100minimum to reduce their thermal noise and a high frequency MHz). An ultralow noise reference source is essential in order to


EADING PLL PERFORMANCE FOR CONVERTER CLOCKS While the phased-locked loop (PL


makes the ADF5610 suitable for use in t


MHz). An ultralow noise reference achieve this level of performance.


30 MAY 2020 | ELECTRONICS


24 bits of fractional resolution are modest, but when paired with the ADF5610’s exact frequency mode functionality, frequency generation with 0 Hz error is possible. Using the ADF5610 as the local oscillator allows the active mixer to be driven directly from the RFOUT port due to the nominal 5 dBm of output power, eliminating the need for additional amplification and saving valuable board space. The output power on the differential divider (PDIVOUT/NDIVOUT) is nominally 2 dBm when used single ended, but it can be combined through a low loss balun or hybrid coupler for narrow-band applications to achieve an additional dB or two of output power.


part by sipping less than 700 mW (low current mode with the out divider disabled) to just over a wat t under worst -case conditions (high performance mode with the output divider set t o divide-by-128). Even in low current mode, the ADF5610’s phase noise performance leads in its class, increasing by just 2 dBc/Hz.


Low power dissipation is essential today and the ADF5610 does its 00 mW (low current mode with the out put


The ADF5610 has good spurious performance, with PFD spurious as low as –105 dBc, and in-band unfiltered integer boundary spurs nominally at –45 dBc.


Analog Devices www.analog.com


/ ELECTRONICS TA ATIION LOS


In addit ion to its broad frequency coverage, industry-leading phase noise, and exceptionally fast lock times, the ADF5610 has additional feat make it attract


he ADF5610 has additional features that


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