HMC7579BG

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Introduction to Attenuators

An attenuator is a device used to reduce the power of a signal without distorting its waveform. It works by controlling the voltage or current supplied to a load. Attenuators come in a wide variety of forms, including RF attenuators, power line attenuators, and audio attenuators. Depending on their design, attenuators may be used in high frequency or low frequency applications, as well as in optical applications.

The HMC7579BG Attenuator

The HMC7579BG is a low-cost, high-accuracy RF/microwave attenuator from the product line of Hittite Microwave Corporation. This attenuator provides a wide voltage gain range of 0.2-60 dB. It is designed to meet the needs for precision RF/microwave applications. The HMC7579BG is manufactured using an advanced BiCMOS process.

Application Field of HMC7579BG Attenuator

The HMC7579BG attenuator is suitable for precision RF/microwave applications such as wireless infrastructure, receiver and transmitter signal level adjustment, spectrum analysis, and transceiver test and calibration systems. Other potential application areas include VSAT transmitters, microwave radio communication systems, and antenna measurements. This attenuator can be used in a variety of industrial, military, and aerospace systems.

The device achieves high accuracy and low insertion loss over a wide frequency range, allowing it to be used in both wideband and narrowband applications. Its broadband performance, coupled with its small size, makes it suitable for use in space-constrained systems. The device has a maximum power-handling capability of 15 dBm for narrowband applications.

Working Principle of HMC7579BG Attenuator

The HMC7579BG attenuator uses Forward-biased PIN (presence-independent-neutral) diode structures, which provide excellent control of voltage gain over a broad frequency range. The device utilizes a negative-feedback scheme to achieve high accuracy. The feedback signal is first amplified by a gain control circuit and then is fed back to the PIN diode. This feedback signal is compared to the input signal, and the differential signal is used to control the PIN diode current so that the output signal is reduced and the desired gain is achieved.

The HMC7579BG attenuator also features a soft shutoff feature which helps to reduce spurious emissions and ensures consistent performance. Additionally, this device offers excellent thermal stability. Its temperature coefficient is 0.003dB/°C, ensuring high performance in even the most extreme conditions.

Conclusion

The HMC7579BG attenuator is a low-cost and high-accuracy device designed for precision RF/microwave applications. It is suitable for use in a wide range of applications, including wireless infrastructure, receiver and transmitter signal level adjustment, spectrum analysis, and transceiver test and calibration systems. The device achieves high accuracy and low insertion loss over a wide frequency range, and includes a soft shutoff feature and excellent thermal stability.

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