We report on t h e realization of an imagereject receiver that covers the various WLAN bands in Europe, J a p a n a n d t h e US, fabricated using a low-cost, 0.8pm productionline SiGeHBT process. A modified Gilbert mixer with a common-base input stage allows for a broadband RF operation from 2.5-6 G H z at a low supply voltage of 3 V. Broadband quadrature generation was achieved hy using a fully integrated X-band VCO at 10 G H z in conjunction with a master-slave divider rather than using a polyphase filter or a quadrature VCO. While consuming less c h i p a r e a than competing solutions, we achieve an excellent image suppression of 40-45 dB without any post-tuning.Index Terms -Microwave bipolar transistor oscillators, microwave frequency conversion, microwave mixers,
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