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SiGe mixer enables cost-effective filter designs

Posted: 20 Nov 2009 ?? ?Print Version ?Bookmark and Share

Keywords:passive mixer? WiMAX? downconverter?

MAX2042 mixer

Maxim Integrated Products rolls the MAX2042 high-performance, fully-integrated, 2,000MHz to 3,000MHz SiGe passive mixer.

Designed for Long Term Evolution, WiMAX, WCS and MMDS, the MAX2042 delivers a combination of linearity, noise performance and component integration. When configured as a downconverter, this IC provides 36dBm of IIP3, 23.4dBm of IP1dB, 7.2dB of conversion loss, and a 7.3dB noise figure. It also exhibits 2nd- and 3rd-order spurious suppression. As an upconverter, the MAX2042 delivers 32.4dBm of IIP3, 67dBc of LO 2IF suppression, and a conversion loss of only 6.8dB. Together, these parameters suit the MAX2042 for base station apps where high linearity and a low noise figure are critical for enhanced receiver and transmitter performance.

As a complete SiGe up-/downconverter, the MAX2042 integrates a double-balanced mixer core with an LO amplifier and two baluns, plus dozens of discrete components. This integration reduces the total board space used by the mixer by 40 percent; it reduces the discrete part count by 33 percent. The MAX2042's 2RF-2LO performance of 70dBc (with a -10dBm RF tone) also eases the filtering requirements of close-in harmonics, thus enabling simpler and more cost-effective filter designs.

This mixer offers an exceptionally wide 50MHz to 500MHz IF frequency range with an 1,800MHz to 3,000MHz, low-side LO injection range. The on-board 0dBm drive LO buffer provides 3dB drive-variance control, thus ensuring stable gain, NF, and IIP3 performance over temperature, supply, and input power. The MAX2042 has excellent gain-variation performance of 0.44dB over the -40C to +85C industrial temperature range. The IIP3 spread is similarly impressive at 0.5dB over temperature.

The MAX2042 is packaged in a compact, 5mm x 5mm, Pb-free, 20-pin TQFN. The package is pin compatible to the MAX2029/MAX2031/MAX2039/MAX2041/MAX2042A/MAX2044 series of mixers. This entire family of passive up-/downconverters work for applications in which a common PC-board layout is used for both wireless-infrastructure frequency bands. Prices start at $5.95 (1,000-up, FOB USA).

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