2.4 Ghz discrete-time receiver without subsampling mixer

A subsampling filter is proposed for a discrete-time receiver (DTR). This filter achieves signal discretisation, filtering and downconversion simultaneously. With the proposed subsampling filtering technique, the subsampling mixer in a conventional DTR is eliminated, which can reduce power, cost and noise. The first 2.4 GHz DTR prototype for Zigbee application is fabricated in a 0.18 μm CMOS process. It achieves 23 dB conversion gain, 17.6 dB noise figure and -15 dBm IIP3. Operated from a single 1 V supply, the low-noise amplifier and following filter stages consume only 3.8 mW and the total receiver power consumption is 25.6 mW.