HMC798LC4

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RF Mixers

RF mixers are RF components that are used to manipulate electrical signals at radio frequencies. They are usually used to process radio frequency signals such as the propagation of a radio wave or to perform frequency translation. In recent years, they have become increasingly important due to the ever-increasing demand for wireless communication systems and devices. One of the most prominent examples of RF mixers is the HMC798LC4. This article will discuss the application field and working principle of the HMC798LC4 RF mixer.

Application Field

The HMC798LC4 RF mixer from Hittite Microwave Corporation is a purpose built DC-18GHz MMIC upconversion mixer. This mixer can be used in a wide variety of applications, from radars to wideband coverage. It is also highly suitable for applications such as satellite and terrestrial wireless communications, VSAT systems, automotive radars, military communications, general purpose broadband amplifiers, and many more.

Working Principle

The HMC798LC4 RF mixer works by converting an input RF signal into a different frequency output signal. This is done by mixing two signals together, which creates an output signal that has both frequencies of the input signals. The output frequency of the conversion depends on the type of mixer used. For example, a frequency multiplier can be used to convert an input signal to a higher frequency output signal. In contrast, an upconversion mixer can be used to convert an input signal to a lower frequency output signal.

The HMC798LC4 RF mixer uses a combination of an active mixer and passive baluns to achieve its excellent performance. The active mixer consists of three active stages connected in a form of a Gilbert cell, and the passive baluns consist of two transmission lines and complementary stubs that provide matched impedance transformation between ports. Both the active mixer and the passive baluns are optimized for low insertion loss and high linearity. This enables the mixer to provide excellent intermodulation and harmonic performance across its entire operating frequency range.

The HMC798LC4 is also designed to provide reliable operation with frequency switching times of 4 microseconds. This makes it ideal for applications that require rapid and reliable frequency switching such as in VSAT systems or military communication systems. Additionally, the mixer is built with an integrated temperature compensation for its LO stage, which ensures its performance is consistent across different temperatures.

Conclusion

The HMC798LC4 RF mixer is an excellent solution for applications that require accurate frequency manipulation, high frequency switching times, and reliable operation across different temperatures. Its combination of active mixer and passive baluns guarantee superior performance in terms of insertion loss, linearity, intermodulation, and harmonics. For these reasons, the HMC798LC4 is a popular choice for a wide variety of applications, from radars to wideband coverage.

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