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Downconversion mixer is highly integrated

Posted: 06 Nov 2008 ?? ?Print Version ?Bookmark and Share

Keywords:mixer downconversion? base station? 4G 3G?


Maxim Integrated Products introduces the MAX19985A 700MHz to 1000MHz, dual, downconversion mixer that integrates an LO switch, buffer, and splitter. Designed using Maxim's proprietary, monolithic SiGe process, this device delivers an unparalleled combination of linearity, noise performance, and component integration. This single IC provides two independent downconversion channels, each with a +25.5dBm (typ) IIP3, 8.7dB (typ) conversion gain, and 9.0dB (typ) noise figure. Additionally, the MAX19985A offers an industry-best 2LO-2RF spurious rejection of 76dBc for an RF level of -10dBm, and 71dBc for a level of -5dBm, claims Maxim. The MAX19985A is designed specifically for 2.5G/3G/4G wireless-infrastructure applications in which high linearity and a low noise figure are critical for enhanced receiver sensitivity and blocker immunity. It is ideal for LTE, WiMAX, GSM/EDGE, WCDMA, and cdma2000 base stations, says Maxim.

As a complete SiGe downconverter, the MAX19985A integrates two state-of-the-art mixer cores; four amplifiers; three baluns; an LO switch, buffer, and splitter; and dozens of discrete components. The device's 8.7dB conversion gain enables the elimination of a complete IF amplifier stage within the receiver lineup. The MAX19985A's outstanding 2LO-2RF performance can also ease the filtering requirements of close-in harmonics, thus leading to simpler and more cost-effective filter designs. Due to integration of this functionality and performance into one monolithic design, this mixer is half the size of comparable discrete solutions and reduces the total part count by 45 percent, touts Maxim.

The MAX19985A is packaged in a compact, 6mm x 6mm, 36-pin TQFN that is pin compatible with the MAX19995/MAX19995A series of 1700MHz to 2200MHz dual mixers, and pin similar to the MAX19997A/MAX19999 series of 1850MHz to 3900MHz dual mixers. This family of downconverters is ideal for applications in which a common PCB layout is used for multiple frequency bands. Prices start at $9.96 (1000-up, FOB USA).

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