Telecoms, Datacoms, Wireless, IoT


Highly integrated RF synthesisers

17 September 2008 Telecoms, Datacoms, Wireless, IoT

Designed to reduce development time, risk and solution size of RF front end circuits in modern radios, the RF205x family of products from RF Micro Devices provides engineers with a highly integrated, yet flexible solution.

These devices use a unique system partitioning, a vertical slice through an RF section, that combines a high-performance fractional-N PLL, low phase noise VCOs, LO buffers and high-linearity RF mixers. The family of products has been designed to generate a low-noise LO signal of between 300 MHz and 2400 MHz, while the built-in wideband RF mixers operate from 100 MHz up to 2500 MHz.

The family includes the RF2051 which comes with an integrated fractional-N PLL, VCOs, LO buffers and two RF mixers for time or full-duplex operation; the RF2052 single-mixer version; and the RF2053 which allows designers to take advantage of an external VCO source, while exploiting the internal mixers and PLL. All devices are contained in standard plastic 32-pin, 5 x 5 mm QFN packages and operate from a 3 V supply.

All RF205x devices use an external loop filter (passive or active utilising the on-chip operational amplifier) that can be optimised to suit varied requirements. Having a choice of a wide range of reference frequencies adds another level of flexibility to the system design. All products in the family can use a crystal of 10 MHz to 52 MHz, or alternatively can accept a reference signal of between 10 MHz and 104 MHz. In order to minimise power consumption, the chips offer programmable bias currents for the on-chip VCOs and RF mixers. RF205x products are programmed using a three-wire interface.

The devices are suitable for applications such as frequency band shifters, wireless repeaters, diversity receivers/transmitters, satellite communications equipment, point-to-point radio links, instrumentation and test equipment, cognitive radio, software-defined radio, PMR handheld and infrastructure equipment and general purpose wideband signal generation.



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