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This paper describes a direct-conversion receiver for WiMedia UWB applications. The receiver consists of separate BG1 and BG3 LNAs including a 2.4-GHz notch filter, quadrature mixers, a base-band gm-C low-pass filter with variable gain, and a fast-hopping synthesizer. The UWB receiver is targeted for a mobile handset and therefore special emphasis has been placed on the reduction of interferers. The...
This paper describes a direct-conversion RF front-end designed for dual-band WiMedia UWB receiver. The front-end operates in band groups BG1 and BG3. It includes multi-stage LNAs, down-conversion mixers, a polyphase filter for quadrature local oscillator (LO) signal generation, and LO buffers. As targeted for mobile handset, several issues related to hostile environment are taken into account in this...
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