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Linear Tech's RF mixer addresses 3G cellular basestations

Posted: 20 Apr 2005 ?? ?Print Version ?Bookmark and Share

Keywords:rf mixer? linear technology? lt5527?

The new high linearity active downconverting RF mixer from Linear Technology Corp. promises to significantly reduce the cost and simplify design of 3G cellular basestations.

The LT5527 device features an operating frequency range extending to 3.7GHz. At 1.9GHz, it offers IIP3 (Input 3rd order Intercept Point) linearity of 23.5dBm, conversion gain of 2.3dB, and a noise figure of 12.5dB. The LT5527's Local Oscillator (LO) and RF inputs operate single-ended and have built-in 50-ohm impedance, requiring few external matching components and reducing basestation cost and design time. Moreover, the LT5527 incorporates a low noise LO buffer, allowing operation at a -3dBm LO drive level, resolving the challenges of RF isolation and reducing the need for external filtering, added Linear Tech.

The LT5527 operates over a wide frequency range of 400MHz to 3.7GHz, covering the 850MHz cellular band, the 1.9GHz and 2.1GHz W-CDMA and UMTS bands, as well other high performance wireless applications that operate in bands at 450MHz, 2.4GHz and 3.5GHz. This new product operates from a single 5V supply voltage. Typical operating current is 78mA. The LT5527 can be shutdown by an ENABLE pin. When disabled, the chip draws 100?A maximum quiescent current to conserve power.

Offered in a 16-pin, 4-by-4mm surface mount QFN package, the LT5527 is priced at $5.80 each in 1,000-piece quantities and is available from stock.

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