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RF mixers fit for high-dynamic range apps

Posted: 06 Mar 2009 ?? ?Print Version ?Bookmark and Share

Keywords:mixer RF? wireless? high range dynamic?

Analog Devices Inc. has introduced a family of five single-channel RF mixers for high-dynamic-range applications within satellite communications, wireless base stations, point-to-point radio links, instrumentation and military equipment.

Covering the 10MHz to 6,000MHz range, the ADL5801 single-channel active mixer has the widest available operating frequency. The ADL5355, ADL5357, ADL5365 and ADL5367 single-channel passive mixers are specified for operation across the cellular frequency ranges.

Suitable for both transmit and receive signal paths, the ADL5801 mixer is a broadband single-channel device that enables down- and up-conversion of signals. The ADL5801 is packaged in a 4mm x 4mm LFCSP and consumes 50 percent less power than the competing passive devices, according to the company. The ADL5801 single-channel active mixer achieves 27dBm IIP3 (third-order input intercept point) with 10dB single sideband noise figure. In addition, the ADL5801 provides a conversion power gain of 1.5dB, reducing the need for an additional IF amplifiers.

Lower power mode
Unique to the ADL5801, an on-chip input power detector can be used to adjust the mixer bias. This adaptive bias feature allows for optimal high IP3 performance when presented with large unwanted interferers, often referred to as blocking signals. When blockers are no longer present, the ADL5801 automatically switches to a lower power operating mode.

The ADL5355 mixer operates over the 1,500MHz to 2,500MHz frequency range; the ADL5357 mixer operates over the 500MHz to 1,500MHz frequency range. Both devices feature on-chip IF and LO amplifiers and input baluns. The ADL5355 and ADL5357 mixers achieve 27dBm IIP3 with 8.1dB power conversion gain and 9.4dB single-sideband noise figure. In high interference environments, where the noise figure must not be degraded due to blocking, both products provide better than 18dB SSB noise figure in the presence of a 10dBm blocker.

The ADL5365 mixer operates over the 1,500MHz to 2,500MHz frequency range; the ADL5367 mixer operates over the 500MHz to 1,500MHz frequency range. Removing the IF amplifier allows the mixer to be configured for use as either an up- or down-converter.

Achieving a low power conversion loss (-7dB), the ADL5365 and ADL5367 mixers provide 31dBm input IP3 and 7.1dB SSB noise figure. They are intended for use in transmit path observation receivers, and other applications that operate with high input signal power. No external components are required on the RF or LO inputs to achieve these results, making them suitable for the highest performance integrated receiver down conversion applications requiring a high-gain mixer. The single-channel passive mixer family provides power-down functions and operates over a 3.3V to 5V supply voltage range.

Both new mixer families, manufactured on an advanced SiGe bipolar process, provide 2,000V HBM ESD, simplifying handling procedures as compared to sensitive GaAs mixers.

The ADL5801 is priced at $5.15; the ADL5355 and ADL5357 are priced at $6.98; and the ADL5365 and ADL5367 are priced at $5.99 in 1,000-unit quantities. Samples are now available.

- Ismini Scouras

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