Patent ID: 7558348

Claim:
A system for communicating radio frequency (“RF”) signals that is compliant with emission masks defining permissible levels of electromagnetic interference (“EMI”), the system comprising: an RF antenna subsystem including: an antenna, and an RF radio receiver formed on a substrate as an RF integrated circuit (“IC”) and having two clock generators and two clock domains including a first clock domain having a fixed data rate for clocking RF radio circuits and a second clock domain having a variable data rate for transporting digital data to a separate base band subsystem with an increased frequency distribution compared with the fixed data rate, said RF antenna subsystem having: an input port coupled to said antenna to receive wireless RF signals and an output port, said RF radio receiver being configured to digitize said RF signals at the fixed data rate to form digitized data signals and to apply said digitized data signals at a variable data rate to said output port for transport of said digitized data signals to said separate base band subsystem, said RF radio receiver including: a fixed clock generator determining said fixed data rate and a rate-averaging spread spectrum clock generator determining said variable data rate, said RF radio receiver including: a transition bridge for exchanging digitized data signals across said two clock domains at an average data rate of said variable data rate that is equivalent to said fixed data rate; and the separate base band subsystem formed on another substrate as a base band IC configured to at least demodulate said digitized data signals, the separate base band subsystem coupled to the output port of the RF subsystem via unshielded conductors with the increased frequency distribution of the digitized data signals reducing EMI associated with data transport over the unshielded conductors.