An adaptive 2.4 GHz low-IF receiver in 0.6 μm CMOS for wideband wireless LAN

Design of 2.4 GHZ Cmos Direct Conversion Lna and Mixer Combination for Wirless Data Link Transceiver.

“…al. reported a double-IF receiver in 0.6um CMOS for Wireless LAN applications [3]. Table 2 lists its results of LNA and first mixer.…”

“…With the introduction of 2.4GHz ISM band for custom wireless data-link applications, research on monolithic transceiver for different applications within this band is becoming hotter and hotter [1] [2] [3]. CMOS transceiver, due to its lowest cost among all possible processes and highest integration ability with digital baseband sub-system for eventual one-chip whole system solution, has come into being the focusing research point in this area [4].…”

“…This makes it difficult to implement CMOS LNA & Mixer with both high performance and low power dissipation features through current available processes. However, with the continuous scaling of CMOS process, this is becoming possible now [3], and will be in production in the near future.…”

High-image-rejection wireless-receiver architecture with a 3-phase active RC complex filter

“…The gain and phase mismatches of the second IF signals depend only on the product of the relative errors of the first IF and the second local signals. This error reduction mechanism resembles the 4-phase double-conversion receiver [14,15], but the architecture is quite different. The final image-rejection ratio is mainly determined by the mismatches of RC values in the 3-phase complex filter.…”

“…Therefore, the residuals of IM1 at the filter output is determined by the mismatches of RC values in the complex filter. The RC mismatches can be reduced with careful-layout techniques [14,15] and the image rejection of more than 60 dB could be obtained [14,15].…”