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Mixer delivers high linearity, low noise for 4G apps

Posted: 23 Mar 2010 ?? ?Print Version ?Bookmark and Share

Keywords:SiGe mixer? downconverting? LO buffer?


Maxim Integrated Products offers the MAX19998, a fully-integrated, 2300MHz to 4000MHz, downconverting mixer with an on-chip LO buffer based on its proprietary monolithic SiGe BiCMOS process. This device claims to deliver an unparalleled combination of linearity, noise performance and component integration over an exceptionally wide band of operation. It is designed specifically for 4G wireless-infrastructure applications in which high linearity and a low noise figure are critical for enhanced receiver sensitivity and blocker immunity.

A single IC provides a fully integrated downconversion channel, with 24.3dBm (typ) of IIP3, 8.7dB (typ) of conversion gain, and a 9.7dB (typ) noise figure. Additionally, the MAX19998 offers 2RF2LO spurious rejection of 67dBc for an RF level of -10dBm, and 62dBc for a level of -5dBm. The device supports both high- and low-side LO injection architectures for 3.1GHz to 3.9GHz LTE and WiMAX(TM) base stations; the MAX19998 can also be configured for 2.3GHz to 2.9GHz LTE, WiMAX, and MMDS high-side LO injection architectures.

As a complete SiGe downconverter, the MAX19998 integrates a state-of-the-art 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 MAX19998's outstanding 2RF2LO performance can also ease the filtering requirements of close-in harmonics, thus leading to simpler, more cost-effective filter designs. 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%.

The MAX19998 is packaged in a compact, 5mm x 5mm, 20-pin TQFN that is pin compatible with the MAX19996 (a 2000MHz to 3000MHz single mixer) and the MAX19996A (a 2000MHz to 3900MHz single mixer). It is pin similar to the MAX9993/MAX9994/MAX9996 (1700MHz to 2200MHz mixers) and the MAX9984/MAX9986 (400MHz to 1000MHz mixers). This entire family of downconverters is ideal for applications in which a common PCB layout is used for multiple frequency bands. Prices start at $6.90 (1000-up, FOB USA)

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