Upconverting mixers integrate RF transformer to ease design

5 May 2004 Telecoms, Datacoms, Wireless, IoT

Two new high linearity upconverting RF active mixers with integrated RF transformers from Linear Technology are claimed to deliver superior performance, linearity and low power consumption. The LT5519 and LT5520 active mixers provide the ideal combination of low distortion, low LO (local oscillator) drive requirement, high port-to-port isolation, low conversion loss, and ease of use.

The LT5519 operates over the 0,7 GHz to 1,4 GHz range, while the LT5520 covers the 1,3 GHz to 2,3 GHz frequency bands without requiring external matching components. Moreover, their single-ended operation makes the design task easier. These devices have applications in cellular basestations, cable modem and video-on-demand headend equipment and high performance satellite transceivers.

An RF output transformer is integrated on-chip to enable single-ended output operation. The RF port is internally 50 Ω matched over the devices' full operating frequency range, so that no external frequency matching components are typically required. They have built-in LO amplifiers, eliminating the need for external LO buffers. The LO port is also designed for single-ended drive, and is internally 50 Ω matched, requiring no external matching components. When used in a radio transmitter, the devices' exceptionally high LO to RF port-to-port isolation greatly reduces the LO leakage to the RF output, which can cause severe interference to radio equipment in other frequency bands and non-compliance with regulatory emission requirements, says Linear. As a result, the total solution minimises costly RF filtering, reduces external components, and significantly lowers the overall cost.

The LT5519 and LT5520 operate from a single 5 V supply, and typically draw 60 mA when operating. In shutdown they consume 1 µA. They are offered in 4 x 4 mm 16-lead plastic QFN surface mount package.

For more information contact Memec SA, 011 897 8600.

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