HMC174MS8ETR

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RF Switches are a critical component within most microwave systems. They serve a variety of functions, from switching and routing signals to full frequency agility, and are highly applicable in the field of radio communications. The HMC174MS8ETR is an example of an RF Switch which provides ESD protection, low insertion loss, high isolation, and fast switching between its many ports. This article will cover the application field and working principles of the HMC174MS8ETR.

Application Field

The HMC174MS8ETR RF Switch can be applied in a wide range of systems, providing an ideal solution for those searching for a reliable component which works with minimal power and offers exceptional quality. The switch is widely used in applications which span the radio frequency spectrum of 5 kHz to 20 GHz. It is particularly relevant within aerospace systems, wireless communication systems, and avionics. This switch is optimal when in need of high linearity and low insertion loss.

Working Principle

The HMC174MS8ETR is a high-performance 8-phase switch manufactured by Hittite Microwave Corp. It is a Single Pole Eight Throw (SP8T) design featuring enhanced ESD protection, via an external blocking resistor, and has a rugged design in order to maintain reliable performance over a wide temperature range. All ports are internally matched and offer an insertion loss of 1.0dB or less when working within its frequency range of 5 kHz to 20 GHz.

The RF Switch has a maximum input SWR of 1.7:1 across the frequency band. It is powered with a single +3.3V supply and has an operating temperature range of -40°C to +85°C. The HMC174MS8ETR can switch over frequency in 0.065µs, providing low switching times and an excellent signal integrity. The device also features high isolation, up to typically 50 dB, even at the highest frequency.

Most RF switches, including the HMC174MS8ETR, use a PIN diode in order to control the RF signal. This diode remains reverse biased in the OFF state, resulting in a high resistance which blocks the RF signal. When the diode is forward biased, the resistance drops significantly, allowing the RF signal to pass through. The bias can be controlled using an external voltage source, allowing for manual or digital control.

There are many benefits when using the HMC174MS8ETR RF switch, from the ruggedness, low-power operation, and excellent linearity to the fast switching times and high isolation. With a variety of applications, such as in wireless communication systems and aerospace systems, this switch provides reliability and performance at an affordable price.

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