HMC333

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RF Mixers

Radio Frequency (RF) mixers are vital components that are used for various applications, from radio systems to switching design. The HMC333 is a wideband, active double-balanced RF mixer designed for wireless infrastructure applications. In this article, we’ll discuss the application field of the HMC333 as well as its working principle.

Application Field

The HMC333 is well suited for use in Wi-Fi and WiMax infrastructure equipment where high dynamic range and low distortion performance are required. It also can be used in wireless local area networks and personal area networks. This mixer enables low-noise conversion to the receiver\'s desired frequency band. Additionally, due to its small size and low power consumption, this mixer is perfectly suitable toward military and aerospace applications.

Working Principle

The HMC333 is a double-balanced active RF mixer that achieves a flat conversion loss of 12 dB from 800 MHz to 3.0 GHz with an input 1 dB compression point greater than -15 dBm. The circuit uses an on-chip transformer with wideband impedance matched input and output ports to isolate the local oscillator from the signal. It has an integrated gain block operating in a true differential fashion and includes two stages of gain. Each stage is fully differential, providing maximum performance. Both stages also feature internal common-mode regulation to handle large signals without introducing distortion.

The mixer includes an integrated resistive attenuator to minimize the side-bands while providing better isolation between the input signals. The mixer also has an integrated chopper-stabilized amplifier that is used to drive the switches. This enables the RF mixer to achieve a high IP3 of 32 dBm, low noise figure of 5 dB, and low LO feedthrough of -50 dBm. The HMC333 also features a very low current draw of only 10 mA, making it ideal for applications requiring low power consumption.

Conclusion

In summary, the HMC333 is a high-performance, low-power active double-balanced RF mixer that is ideally suited for high dynamic range applications in wireless infrastructure equipment. It has an input 1 dB compression point greater than -15 dBm, an IP3 of 32 dBm, a noise figure of 5 dB, and an LO feedthrough of -50 dBm. Additionally, the circuit is easy to use and requires minimal external components. For these reasons, the HMC333 is a great choice for any wireless application.

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