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PLL synthesiser drives VCOs to cut out active loop filters

Posted: 23 Jun 2010     Print Version  Bookmark and Share

Keywords:PLL synthesiser  loop filter  voltage-controlled oscillator  VCO 

Analog Devices Inc. has released a PLL synthesiser for a variety of applications, including microwave point-to-point systems, PMR (private mobile radio), VSATs (very small aperture terminals), test and instrumentation equipment and aerospace systems.

The ADF4150HV 4.4GHz fractional-N or integer-N PLL synthesiser features a 30V charge pump. Because the device can be used to directly drive high tuning-voltage external voltage-controlled oscillators (VCOs), it removes the need for active loop filters.

The ADF4150HV allows the use of passive loop filter topologies, which do not tend to degrade phase noise when compared to active loop filters. The device incorporates high performance on-chip frequency dividers, allowing the VCO frequency to be divided by 2, 4, 8 or 16 to allow the user to generate RF output frequencies as low as 31.25MHz. Since the ADF4150HV has a 30V charge pump capability, it allows designers to consider wideband (octave range) VCOs. Hence, with the on-chip dividers provided on the ADF4150HV, a designer can simultaneously realise a synthesiser with multi-octave tuning capability as well as low phase noise afforded through the use of an external VCO.

The ADF4150HV is supported by ADIsimPLL Version 3.3 design tool, which features many updates and improvements, such as support for 16 new devices, increased phase noise modelling accuracy and Fractional-N spur level estimation, along with enhancements to the tool's New Design Wizard, Time Simulation Engine and Time Domain Simulator features.

Pricing for the ADF4150HV PLL synthesiser in a 32-LFCSP package is Rs.114.30 ($2.49) each in 10,000 units.

- Ismini Scouras

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