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RF Mixers

HMC552LP4 is a low-cost, 5-bit, early-stage, silicon monolithic mixer whose active components are triple-balanced Gilbert mixers.Monolithic technology provides excellent frequency response and the various features of the circuit make it easier to use in applications including frequency translation, up-conversion, down-conversion, and phase-shift modulation.

Application Field

The HMC552LP4 can be used as a low-noise down-converter with an input up to 9.0 GHz and a local oscillator (LO) up to 5.0 GHz. It can be applied to the 4 - 8 GHz frequency range with a high-side LO injection. The low noise figure of the HMC552LP4 allows it to be used as a low-noise amplifier (LNA). This mixer can be used in receivers, microwave communication systems, wireless instrumentation systems, and medical systems.

Working Principle

The HMC552LP4 contains three triple-balanced Gilbert mixers, each of which is composed of three matched, insulated-gate bipolar transistors (IGBTs) and six matching resistors. An input signal is applied to the mixer between the collectors of the three IGBTs in order to institute mixing action.The IF (intermediate frequency) output of the mixer is fed into an IF amplifier, which is also typically integrated with the mixer. The Gain of the IF amplifier is controlled by the bias current of the mixer, which is supplied by an external reference.

The mixer functions as an active, one-port device. The RF waveform modulates the bias current of the IGBTs to create the IF output signal. The gain of the mixer is proportional to the bias current and can also be varied by changing the bias current. Additionally, the mixer also has an adjustable local oscillator (LO) port. By varying the frequency of this LO port, the frequency of the IF output can also be adjusted.

Conclusion

The HMC552LP4 is a great choice for applications that require a mixer with low noise and high linearity such as frequency translation, up- and down-conversion, and phase-shift modulation. The three triple-balanced Gilbert mixers make it easier to use and the adjustable LO port allows for flexibility in frequency tuning. The high-side LO injection also makes it possible to operate in higher frequency ranges. With its great performance and features, the HMC552LP4 is perfect for a wide variety of applications.

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