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The ETSI standard for license-free short range devices (SRDs) in the 433/868 MHz bands, EN 300 220, sets the requirement to receiver spurious emission to <–57 dBm. FCC (USA) has similar, but somewhat less strict regulations. This application note deals with LO leakage in detail. This includes findings from making numerous of reference designs. LPRF has reference designs for all our transceivers. LO leakage is the single most important reason for users of the CC1000 to copy these layouts/BOM to the smallest detail. The requirement for an LO leakage of –57dBm is met for all our reference designs.
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