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PLL with VCO synthesiser boosts base station performance

27 Jan 2016

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Analog Devices Inc. (ADI) has announced a phased-locked loop (PLL) synthesiser with integrated voltage-controlled oscillator (VCO) that enables mobile network operators to improve cellular base station performance and the quality of wireless service. The ADF4355 PLL with VCO synthesiser operates up to 6.8GHz, a frequency band that allows significant margin to industry's current carrier frequencies. When designed into cellular base stations, the PLL synthesizer's higher frequency and lower VCO phase noise enables wireless service providers to increase call throughput and cell phone coverage and service more users per base station at no significant additional cost.

The device's higher frequency band offers similar throughput advances for makers of point-to-point/point-to-multipoint microwave links, satellite/VSAT systems, industrial and test and measurement systems as well as other wireless equipment.


In frequency generation applications for wireless and industrial applications, where VCO phase-noise performance plays a pivotal role in determining the overall system performance of the RF signal transmission and receive, the choice of PLL synthesiser for the RF local oscillator (LO) is a key system design consideration. ADI's ADF4355 wideband PLLVCO synthesiser meets the exacting VCO phase noise requirements for frequency generation applications while delivering a cost-competitive alternative to other PLL devices, stated the company. This combination of features allows designers to reduce risk by ensuring the lowest possible phase noise, extending frequency coverage, shrinking footprint and increasing operating range across temperature.

The ADF4355 PLL synthesiser's integrated VCO has an output frequency ranging from 3.4GHz to 6.8GHz. The VCO frequency is connected to divide by 1, 2, 4, 8, 16, 32 or 64 circuits, which allows the designer to generate RF output frequencies as low as 54MHz, thereby allowing the ADF4355 to cover a continuous range from 54MHz to 6.8GHz with no gaps. For applications that require noise isolation, the RF output stage features a mute function that is both pin and software controllable. The ADF4355 can operate in either fractional-N or integer-N mode and with 38bit modulus resolution, offers exact mode frequency operation, independent of reference input frequency.


Functional block diagram

Control of all on-chip registers is through a simple 3-wire interface. The ADF4355 operates with analogue and digital power supplies ranging from 3.15V to 3.45V, with charge pump and VCO supplies from 4.75V to 5.25V. The ADF4355 also contains hardware and software power-down modes.

The ADF4355 is offered in 32-lead 5mm x 5mm LFCSP package for $20.44 each per 1,000 units. The EV-ADF4355SD1Z is available for $300 per unit.


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