RF2418

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RF2418 is an Integrated RF mixer device consisting of a Gilbert Cell and other active and passive components fabricated with a CMOS process. Its most common use is as an IF mixer for single-conversion receivers. It can also be used as a general-purpose, wideband mixer with a large dynamic range.

RF2418 is available in a 2.5mm by 2.0mm, 8-pad, chip scale package. The device is very compact but still provides excellent RF port to port isolation and low conversion loss. It has low power consumption and low current noise making it a good choice for low noise applications. RF2418 is capable of combining signals over a wide range of frequencies and provides excellent performance for single conversion receivers.

Working Principle:The RF2418 mixer comprises of a Gilbert Cell from two cross-coupled matched devices along with other active and passive elements. The Gilbert Cell works as a transconductance amplifier. Its inputs are two balanced signals and its output is the sum and difference of the two signals.The Gilbert Cell uses a DC bias current applied to the termination of the RF signal and an AC ground bias applied to the input. This AC bias acts as an oscillator, creating a feedback loop for the signals to pass through.The output of the Gilbert Cell is then sent to two low-pass filters (LPFs), which act as limiters, preventing the harmonics produced by the mixer from entering the receiver. After the LPFs, the signal is then sent to the IF amplifier.

Applications: RF2418 is especially well suited for use in direct conversion receivers, due to its wide frequency range and low power consumption. It can be used in any application requiring wideband frequency mixing and low noise, such as wideband receivers, general-purpose mixers, frequency hopping receivers, video systems, and cable/satellite receivers.RF2418 is also used in wireless link systems, such as satellite communications, cellular systems, and Wi-Fi systems. It can also be used in short range communication systems and active antenna systems.

In conclusion, RF2418 is a low noise, wideband mixer designed for single conversion receiver applications. Its small chip scale package, low power consumption, low current noise, and wide frequency range make it ideal for low noise applications such as Wi-Fi and RF link systems.

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