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A low-IF polyphase channel filter for a dual-mode Bluetooth/ZigBee transceiver is described. Implemented in a standard 0.18 /spl mu/m CMOS process, the filter has a fifth-order 0.5 dB equiripple bandpass response and employs novel transconductor and preamplifier designs. It consumes 1 mW and achieves image band rejection /spl ges/33 dB, signal-to-noise(More)
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