This　paper　presents　a　low-power　low-cost　780MHz　CMOS　Frequency　shift　keying　(FSK)　receiver　for　short-range　wireless　communication.　A　current-reused　Low　power　amplifier　(LNA)　and　a　single-balance　passive　mixer　are　employed　to　cut　down　the　current　consumption　of　the　RF　frontend　in　receiver.　A　3rd-order　active-RC　complex　filter　with　reconfigurable　bandwidth　is　implemented　and　a　novel　automatic　tuning　circuit　is　used　in　the　filter　to　eliminate　the　negative　effect　of　the　Process,　voltage,　temperature　(PVT)　variations.　A　novel　replica-circuit　master-slave　automatic　tuning　circuit　and　a　discrete-time　differentia　tor　are　employed　in　demodulator　to　keep　the　demodulation　performances　from　the　PVT　variations　and　the　frequency　offset　of　Intermediate　frequency　(IF).　The　receiver　is　fabricated　in　0.18　mu　m　CMOS　and　occupies　a　chip　area　of　about　0.97mm(2).　It　can　achieve　a　sensitivity　of　83.7dBm　and　a　tolerance　of　IF　range　from　1.5MHz　to　-3.7MHz　with　a　4.7mA　current　consumption　under　a　1.8V　supply.