ADI Launches Broadband Direct Conversion Radio Solution For Cellular Base Stations
Norwood, MA -- Analog Devices, Inc. (ADI) is extending its RF portfolio with a high performance broadband direct conversion radio solution: the ADL5375 I-Q modulator and companion ADL5382 I-Q demodulator. The ADL5375 and ADL5382 devices enable equipment designers to implement and standardize on solutions that address the wide range of operating frequency bands and standards, including GSM/EDGE, CDMA 2000, and W-CDMA, eliminating the need to select a modulator or demodulator for each cellular standard and operating band. Designers can now implement one common radio platform for cellular standards as well as broadband wireless 802.16 WiMAX standards, which are increasingly being designed using direct conversion radio architectures.
The ADL5375 offers a frequency range of 400 MHz to 6 GHz for direct up conversion transmitter architectures. The ADL5375 combines high linearity with 24-dBm output IP3, a high linear output power with +10-dBm P1dB, and a low –161-dBm/Hz noise floor. The ADL5375 provides unadjusted sideband suppression of –55 dBc and unadjusted carrier feed-through of –41 dBm, helping to eliminate the need for calibration circuitry among applications within cellular 2G and 3G radios. In addition, the ADL5375 allows the user to shut down the transmitter, simplifying receiving of small signals in time division applications, such as WiMAX and TDS-CDMA.
The ADL5382 covers the RF frequency range of 700 MHz to 2.7 GHz, offering a high dynamic range with high linearity specifications, exemplified by second and third order intercept point specifications of 60-dBm IP2 and 30-dBm IP3, and a high input compression of 13-dBm P1dB. Combining these specifications with the ability to handle high interference signals with minimal noise contributions ensures that the receiver dynamic range is maintained, a critical requirement for direct conversion receivers and now practical across the ADL5382's broad operating frequency range. With integrated baseband output amplifiers, the ADL5382 reduces external parts count and simplifies subsequent filter design. Furthermore, the ADL5382 provides approximately 5 dB of conversion gain, helping to minimize the gain requirements of the receiver front end.
The ADL5375 quadrature modulator is available in full production. The ADL5382 quadrature demodulator is sampling now and will be available in full production quantities in March 2008.
SOURCE: Analog Devices, Inc.