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Integrated SiGe mixer saves board space

Posted: 20 Nov 2009     Print Version  Bookmark and Share

Keywords:passive mixer  WiMAX  down-converter 

MAX2042 mixer

Maxim Integrated Products claims that its MAX2042 is the industry's first highest performance, fully integrated, 2,000MHz to 3,000MHz SiGe passive mixer.

It is designed for Long Term Evolution, WiMAX, WCS and MMDS. When configured as a down-converter, 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 up-converter, 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-/down-converter, 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 per cent; it reduces the discrete part count by 33 per cent. 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 -40°C to +85°C 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-/down-converters work for applications in which a common PC-board layout is used for both wireless-infrastructure frequency bands. Prices start at Rs. 290.45 ($5.95) (1,000-up, FOB USA).

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