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Analog Devices has introduced what it claims is the industry’s most highly integrated wideband passive mixers for communications applications.

The ADL5811 single-channel and ADL5812 dual-channel mixers deliver unmatched linearity, low distortion and low noise combined with wideband frequency performance.

The new devices enable multiband, single-board receiver designs by combining a wideband LO (local oscillator) amplifier, a programmable RF balun, a high-linearity mixer core, a programmable IF filter, and an IF amplifier.

ADI’s new passive mixers extend across a 700 to 2,800MHz frequency range in a single device while delivering input IP3 (third order intercept) of 24dBm, an 11dB SSB noise figure and 7dB of power conversion gain.

These performance specifications are maintained across the full operating frequency range.

The ADL5811 and ADL5812 passive mixers are designed for wideband wireless infrastructure applications and software-defined radio applications, including multi-band/multi-standard cellular base station receivers, wideband radio link down converters, multi-mode cellular repeaters, and picocells applications.

The high performance across 700 to 2,800MHz of the new passive mixers is the result of three technical advances, most significantly the development of a limiting LO amplifier capable of generating a high-voltage, fast-rise-time, square wave over a wide bandwidth with no DC current penalty compared to existing narrow band mixers.

The second technique involves the integration of a tuned,RF balun structure to ensure a well-balanced RF signal is applied to the FET mixer.

Previously, narrowband mixers incorporated an RF balun consisting of a magnetic or transmission line transformer, which provided low loss but only moderate bandwidth.

A third technique addresses the potential for the passive mixer’s structure to generate a composite signal that could result in the early compression of the IF amplifier.

ADI reduced the amplitude of the unwanted sideband into a load by designing a tuned filter network to provide the proper sum termination as a function of the RF and LO frequencies.

The frequencies of the ADL5811 and ADL5812 can be easily changed using a three-wire SPI (serial port interface), which allows designers to tune the mixers with no need for external impedance matching components.

Performance can be further optimised by digitally adjusting the DC bias voltage to the passive mixer gates.

To minimise power dissipation, each channel of the dual-channel ADL5812 can be enabled or disabled independent of the other.

For DPD (digital pre-distortion) transmit observation receivers or non-diversity applications, the single-channel ADL5811 can implement a single receiver chain in a multi-channel or multi-band platform.

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