HMC955LC4BTR-R5

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The HMC955LC4BTR-R5, a 2.5GHz GaAs MMIC SPDT RF switch developed by Hittite, is an ideal choice for wireless infrastructure and general purpose applications which require high performance switching solutions. It has a low insertion loss over a wide frequency bandwidth and provides high linearity with low power consumption. It is designed to be used in receiver and transmitter switching applications such as cellular base stations, wireless access points and general purpose RF switching. This paper will discuss the application field and working principle of this switch.

Application Field

The HMC955LC4BTR-R5 switch can be used in a wide variety of applications. It is suitable for both single-ended and differential applications where high linearity, low insertion loss and low power consumption is required. It can be used in applications such as cellular base stations, data links, VSAT terminals, Wi-Fi access points, satellite communication systems and general purpose high-frequency switching. It is also ideal for laboratory test and instrumentation as it provides excellent isolation and low noise performance.

Working Principle

The HMC955LC4BTR-R5 switch is based on GaAs MMIC technology. It consists of a low loss SPDT switching core, a complementary transmission line balun, a series enhanced impedance matching and DC blocking capacitor. The device operates over a wide frequency range of DC-2500 MHz. The switching core consists of a pair of GaAs MESFETs which are capable of handling signals with a P1dB of up to 28dBm. The internal balun provides isolation between the balanced transmission lines, allowing the use of a single-ended control signal. The enhanced impedance matching circuit allows the device to match to a variety of load and source impedance conditions, enabling the switch to achieve good performance over a wide range of applications.

The device provides excellent linearity and low power consumption for low noise operation. It also provides a high Isolation of 36dB with a low Insertion Loss of 2.8dB which is typical at 2.5GHz. The device requires a single control voltage at 3V for switching, making it ideal for applications with limited power supply. It has an input reflection coefficient of -20dB, making it suitable for use in high-power and high-linearity applications.

Conclusion

The HMC955LC4BTR-R5 switch is a high-performance switch that can be used in a variety of applications requiring high linearity, low power consumption and low noise operation. It provides excellent test and instrumentation performance, with a low insertion loss of 2.8dB and high isolation of 36dB. It requires a single control voltage of 3V and is suitable for use in both single-ended and differential applications. Its wide frequency bandwidth, high linearity and low power consumption make it an ideal solution for wireless infrastructure and general purpose switching requirements.

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