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Direct IF Conversion in Next Generation Wireless Base Stations

Wed, 05/30/2001 - 11:55am
The AD9772A is the newest member of the TxDAC family of transmit digital-to-analog converters from Analog Devices, Inc. (ADI). The AD9772A is a direct IF-capable multi-mode DAC that simplifies and lowers the cost of next generation wireless basestation design by eliminating an intermediate analog conversion stage. This approach also facilitates the use of software-defined radio architectures, such as SoftCell, that readily support multimode and multicarrier functionality.

ADI's SoftCell™ chipset solution, which includes the AD9772A, provides a complete transceiver signal chain for software-defined radio architectures. The AD9772A's enhanced on-chip circuitry improves overall signal quality and channel capacity, enabling specification-compliant SoftCell implementations for multi-carrier IS95 and multi-mode (GSM/EDGE) systems, as well as for 3G (cdma2000, WB-CDMA) cellular base stations. The AD9772A features a -10 dB incremental improvement in IMD (inter-modulation distortion) performance and a -6 to -8 dB reduction in PLL (phase lock loop) phase noise over the previous generation. In addition, the new wideband DAC features a 14-bit 2 interpolating DAC with allowable input data rates up to 160 MSPS. The 14-bit AD9772A delivers -75 dB of IMD performance and a 70 dB ACPR (adjacent-channel power ratio) for improved baseband performance. Spectral noise density - a key parameter for broadband spread-spectrum, QPSK and QAM applications, is -155 dBm/Hz.

The AD9772A is packaged in a 48-lead LQFP and operates over the extended industrial temperature range (-40 ° C to 85 ° C).

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