HMC199AMS8

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RF switches are essential components of consumers electronics, allowing different signals to be connected with particular electronic devices. With the development of electronics industries, RF switch manufacturers are meeting increasing demands for higher performance and better reliability. HMC199AMS8 is an example of a RF switch designed to take advantage of these requirements.

HMC199AMS8 is a broadband low noise, high isolation E-pHEMT RF switch which operates from 8 Mbps to 8 GHz and absorbs only 0.35 dB of losses at 3 GHz. The switch is based on a GaAs four-channel SPDT (Single-Pole Double Throw) design and a switch matrix integrated circuit for switching signals between several different ports. It is supplied in a 16-lead ceramic SMT package.

The HMC199AMS8 is used in wireless and broadcast applications, multi-antenna systems, satellite communication systems, network switches, mediaconverters and smart amplifiers. It is also applicable to military and aerospace areas which require efficient operation over a wide frequency range and high isolation of signals.

The key application areas of the HMC199AMS8 are:

• Automotive Telecommunications
• Consumer / Home Entertainment
• RF / Microwave
• Medical.

The operating principle behind HMC199AMS8 is a Dielectric Resonator Oscillator (DRO). The DRO employs electric field between the dielectric resonator, dielectric resonator walls and the excitation electrode to form a circuit and produce a frequency, which is controlled by the voltage applied to the resonator. The switch consists of four independent DROs, each providing a signal to its output port. These signals can be controlled individually with different voltage levels applied to each DRO.

The switching mechanism of the HMC199AMS8 is based on a combination of analog and digital methods. The analog part of the switch consists of a voltage controlled oscillator (VCO) and an analog switch matrix. The digital part is designed to control the VCO frequency and the analog switch matrix. When a switch command is received, the digital part of the switch sets the VCO and analog switch matrix to the corresponding configuration, thus connecting the desired output port to the respective input port.

The HMC199AMS8 is a high performing, low noise, low power, low cost RF switch. It offers low insertion losses and high isolation across a wide frequency range. Its combination of analog and digital control provides fast switching times and enables it to be used in a variety of applications.

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