HMC351S8E

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The HMC351S8E is a passively balanced RF Mixer and make up a crucial link in the signal chain within the receiver and transmitter architectures for high dynamic range applications. Unlike the balanced mixers that use a single balanced diode in an RF signal chain, the use of HMC351S8E effectively doubles the linearity in new applications, which can allow users to bring the power of RF & microwave systems to new levels. In this article we will look at the application fields and working principle of the HMC351S8E.

Application Fields

The HMC351S8E has been used in various RF applications, such as frequency conversion, wideband direct conversion receivers, military and commercial radar systems, broadband up and down conversion for cable TV, telecommunications, WiMAX, wireless local loop, and Wi-Fi systems.

In addition, the HMC351S8E is frequently used in cellular, satellite, and conventional radio receivers. With the low noise figure and high IP3, the device is a great choice for heterodyne receivers, dual conversion receivers, low noise downconverters, and signal monitoring systems. Overall, the application fields of the device are just about limitless.

Working Principle

The HMC351S8E provides a complete balanced mixer solution by providing a single passive balanced mechanism that operates from RF port to IF port. An external bias network sets the diode reverse bias and the RF port AC coupling. Meanwhile, the LO port isolation from RF port is extremely high due to the balanced structure.

The working principle of the HMC351S8E is to firstly generate the Low Noise Amplifier (LNA) at the RF port. This LNA isolates the RF signal, thus providing an effective high-impedance match for the RF and LO ports. Secondly, the diode is connected to the output of the LNA and to the IF port, forming a balanced mixers for generating an Intermediate Frequency (IF) signal from the incoming RF signals. Finally, the AC coupling and external bias networks couple, set, and regulate the diode current.

The HMC351S8E is also an ideal solution due to its low insertion loss and low Noise Figure (NF). With the low insertion loss of 0.4 dB, the HMC351S8E has a good insertion loss, meaning the device can easily cover a wide range of frequency bands with no performance loss. The low NF of 1.7dB also suits well for high frequency applications.

The HMC351S8E is primarily designed for applications with external local oscillator sources, as well as low phase noise. The device has a wide operating frequency range of up to 50GHz, and can match the frequency of the RF signal up to 80-100GHz. Furthermore, the HMC351S8E has extremely low harmonic leakage, which is beneficial for minimal harmonic distortion when used in DC to IF applications.

The HMC351S8E is a reliable device that has no need for external SMT components, thus allowing for reliability and repeatability of the assembly process. The device also requires only minimal external circuit components and exhibits good repeatability of the performance over a wide temperature range.

Conclusion

In conclusion, the HMC351S8E is a versatile and highly reliable RF Mixer that can be used in various applications, including frequency conversion, direct conversion receivers, military and commercial radar systems, cable TV, and telecommunication systems. The device is easy to assemble, and has a good insertion loss, low noise figure, wide RF-LO port isolation, and low harmonic leakage. All these factors make HMC351S8E a great choice for high dynamic range applications.

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