Philips Semiconductors has announced a new generation of RF synthesizer technology. The company's latest achievement is a sigma-delta based fractional-N RF-synthesizer with extremely low phase noise - 103 dBc/Hz. By simultaneously delivering low phase noise and fast acquisition time, Philips says the new RF synthesizer technology is ideally suited to meet the requirements for the emerging 2,5 and 3rd generation digital wireless services, including general packet radio service (GPRS) and high speed circuit switched data (HSCSD) of the global system for mobile communications (GSM) standard, as well as IS-95B & C, 1-3xRTT of CDMA standard and upcoming UMTS systems.
The new synthesizer chips will feature a main divider with integer ratios from 33 to 509 in conjunction with a 2nd order programmable sigma-delta modulator that provides a frequency resolution of 1/223 times the phase detector frequency. The phase detector on the new chips operates with input frequencies up to 30 MHz. The devices will also have multiple integrated charge pumps for loop filter design flexibility and an auxiliary integer divider that operates from 80 to 750 MHz. All this is enclosed in a 4 x 4 mm 24-pin BCC package, says Philips Semiconductors.
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