Electronic Design

Single-Channel RF Mixers Set Performance Benchmarks

Analog Devices has released a family of five single-channel RF mixers for high-dynamic-range applications within satellite communications, wireless basestations, point-to-point radio links, instrumentation, and military equipment. The ADL5801 active mixer covers 10 to 6000 MHz for the widest available operating frequency, while the ADL5355, ADL5357, ADL5365, an ADL5367 passive mixers are specified for operation across the cellular frequency ranges.

The ADL5801 is the industry’s first broadband single-channel device to enable the downconversion and upconversion of signals while offering the industry’s highest linearity for active mixers, Analog Devices says. It suits the transmit and receive signal paths, comes in a 4- by 4-mm lead-frame chip-scale package (LFCSP), and consumes 50% less power than competing devices, ADI says. In addition, it achieves 27-dB IIP3 (third-order input intercept point) with a 10-dB single sideband noise figure.

Additionally, the mixer provides a 1.5-dB conversion power gain, reducing the need for additional IF amplifiers. Its on-chip input power detector can be used to adjust the mixer bias. This adaptive bias feature allows for optimal high-IP3 (third-order intercept point) performance when presented with large unwanted interferers, often called blocking signals. When blockers are no longer present, the ADL5801 automatically switches to a lower-power operating mode.

The ADL5355 operates from 1500 to 2500 MHz, and the ADL5357 operates from 500 to 1500 MHz. With on-chip IF and LO amplifiers and input baluns, they offer the highest level of integration, according to the company. They also achieve 27-dBm IP3 with 8.1-dB power conversion gain and a 9.4-dB single-sideband noise figure. In high-interference environments, where the noise figure must not be degraded due to blocking, both provide best-in-class performance with a better than 18-dB single side-band (SSB) noise figure in the presence of an 10-dBm blocker.

The ADL5365 operates from 1500 to 2500 MHz, and the ADL5367 operates from 500 to 1500 MHz. Removing the IF amplifier allows them to be configured for use as an upconverter or as a downconverter. Achieving the industry’s lowest power conversion loss (–7 dB), ADI says, they provide 31-dBm input IP3 and a 7.1-dB SSB noise figure. Featuring the highest input linearity IP3 specifications, they suit 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 best-in-class results, suiting them for the highest-performance integrated receiver downconversion applications requiring a high-gain mixer. Unlike competitive devices, ADI says, the single-channel passive mixer family provides power-down functions and operates over a 3.3- to 5-V supply voltage range, suiting them for power-sensitive applications.

Both new mixer families, manufactured on an advanced silicon-germanium (SiGe) bipolar process, provide 2000-V human body model (HBM) electrostatic discharge (ESD), simplifying handling procedures compared to sensitive gallium-arsenide (GaAs) mixers. The mixers and evaluation boards are available to order in sample quantities. The ADL5801 costs $5.15; the ADL5355 and ADL5357 cost $6.98; and the ADL5365 and ADL5367 cost $5.99 in 1000-unit quantities.

Analog Devices Inc.


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