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Downconverting SiGe mixer suits up for wireless tasks

Posted: 07 Oct 2008 ?? ?Print Version ?Bookmark and Share

Keywords:SiGe downconverting mixer? wireless? buffer LO?


From Maxim Integrated Products comes the MAX19996, a fully integrated, 2000MHz to 3000MHz, downconverting mixer with an on-chip LO buffer. Designed using the company's proprietary, monolithic SiGe process, this device delivers a combination of linearity, noise performance, and component integration. This single IC provides a fully integrated downconversion channel with +24.5dBm (typ) IIP3, 8.7dB (typ) conversion gain, and 9.6dB (typ) noise figure. Additionally, the MAX19996 offers a 2RF-2LO spurious rejection of 69dBc for an RF level of -10dBm, and 64dBc for a level of -5dBm. The MAX19996 is designed specifically for 3G/4G wireless-infrastructure applications. It is ideal for 2.3GHz to 2.8GHz WCS, LTE, WiMAX, and MMDS base stations.

As a complete SiGe downconverter, the MAX19996 integrates a mixer core, two amplifiers, two baluns, 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 MAX19996's 2RF-2LO performance can also ease the filtering requirements of close-in harmonics. Through this combination of integration and performance, the device reduces downconverter solution size by a factor of 2x and the discrete part count by 34 percent.

The MAX19996 is packaged in a compact, 5mm x 5mm, 20-pin TQFN that is pin compatible with the MAX19996A (a 2300MHz to 3900MHz single mixer). It is also pin similar to the MAX9993/MAX9994/MAX9996 (1700MHz to 2200MHz mixers) and the MAX9984/MAX9986 (400MHz to 1000MHz mixers). Prices start at $6.90 (1,000-up, FOB USA).

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