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Two-chip CMOS Dual-band Chipset for 802.11a/b/g WLAN Applications Nov 1, 2002 12:00 PM , quality of service (802.11e), dynamic frequency selection and transmit power control (802.11h).
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The highly integrated, single-chip dual band transceiver, built on the 1.8 V DC, 0.18m CMOS process, reduces system design complexity, lowers BOM cost and features low power consumption figures of 200 mW (transmit/receive).
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The transceiver incorporates true zero-IF CMOS architecture, which directly converts 5 GHz and 2.4 GHz to baseband frequencies without any intermediate frequency stages and without the need for external filters. The transceiver also is designed to support the 2.4 GHz OFDM requirements for the emerging 802.11g standard.
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The zero-IF architecture integrates the LNA, filters, PLL, synthesizers and VCO required for dual-band operation with only a nominal increase in circuitry. This level of integration results in a single-chip dual band radio with minimum external components.
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The baseband/MAC chip is designed to support 802.11b at 11 Mbps, as well as 802.11a/g at 54 Mbps. The modem contains proprietary algorithms optimized for true zero-IF system performance with DC offset removal and IQ imbalance correction algorithms. AccuChannel equalization technology extends the range and data rates for WLAN deployment by counteracting the effects of signal degradation caused by real world impairments such as multipath delays and signal attenuation.
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The RN5220 implements a fully programmable IEEE 802.11-compliant MAC running on an on-chip ARM processor. The MAC firmware can be provisioned for customer-specific differentiating features such as network performance enhancement, network management and power control.
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The RN5220 chipset is made up of a two-chip combination of a transceiver and a baseband/MAC chip. The single-chip transceiver has a tuning range of 4.9 GHz to 5.4 GHz, consumes less than 200 mW in typical transmit and receive modes and has a measured 7 dB noise figure for 802.11a and 6 dB for 802.11b.
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