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Maxim SiGe mixer simplifies circuit design

Posted: 30 Oct 2002 ?? ?Print Version ?Bookmark and Share

Keywords:maxim integrated products? max9981? sige mixer? gsm900 mixer? cdma2000 mixer?

The MAX9981 SiGe mixer from Maxim Integrated Products includes an LO switch and splitter, two LO buffers, and on-chip baluns in a 6-by-6mm, 36-pin QFN package, reducing the overall size and part count of a mixer circuit by 2.5 times and 52 percent, respectively.

Specifically designed for use in GSM900, cdma2000, TDMA, and iDEN basestation applications, the MAX9981 provides 2dB of conversion gain, 12dB of noise figure, and 26.8dBm of IIP3 performance, while replacing two mixers, four amplifiers, three baluns, an LO switch and splitter, and other discrete components. The device is also claimed by the company to provide a more ESD-reliable solution than GaAs alternatives.

The integrated LO switch supports GSM frequency hopping, and switching speeds <250ns are typical with >50dB of LO-to-LO isolation. The on-board LO buffer provides 5dB drive variance control to provide stable G, NF, and IIP3 performance over temperature, supply, and input power.

Gain spread is measured at 0.6dB from nominal at room, and -0.0135dB/C. The IIP3 spread is 0.5dB over temperature.

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