![]() ![]() Hence, attenuators are often designated by the decibel (dB) drop the attenuator provides. The basic passive attenuator acts as a resistive element that reduces the incident signal by a certain amount of signal energy. RF Attenuators can be passive or active devices with variable attenuators depending on the design. RF limiters are typically connectorized with coaxial or waveguide interfaces, though there are surface mount RF limiters. Hence, a greater incident signal energy will result in higher RF limiter attenuation and a proportionally reduced output signal. In this implementation the resistance, or attenuation value of the RF limiter is a function of the incident signal power. PIN diodes are commonly used to implement RF limiters as incident-power controlled, variable resistors. This is the case in portions of the signal chain, such as the input ports of a mixer or gain block amplifier. ![]() RF limiters may be used anywhere in a signal chain that may experience unintended or unavoidable high signal energy that could damage components or result in undesirable operation. For instance, a low-noise amplifier (LNA) is often a sensitive device where incident power beyond a certain threshold may result in derating or damage to the LNA. It is common to use RF limiters to protect sensitive receivers and signal conditioning circuitry from high incoming signals that would otherwise desensitize the receiver or damage the signal conditioning components. RF limiters are devices that reduce an incoming signal if it’s power level exceeds a threshold of the limiter. These components are often used to protect sensitive RF components and devices.There are also a wide range of RF limiters and attenuators that also operate various ways that may be advantageous for some systems and not others. However, they do so in different ways that are key to understanding their use. Topic: Avoiding RF Isolators - Reflectionless Filtering Components for Emerging Wireless SystemsBoth RF limiters and Attenuators reduce the power of an RF signal. Experimental results of several proof-of-concept demonstrators in a variety of technologies will be also presented. This includes both mono-functional and multi-functional RF devices in which several RF-analog-signal-processing actions are co-integrated together. After introducing the problems of RF power reflections in RF front-end chains and classic solutions to circumvent them with their limitations, the main strategies for the design of reflectionless RF passive components as new paradigm will be described. The purpose of this webinar is to familiarize the audience with the emerging topic of reflectionless/absorptive RF passive components, which may result in considerabe benefits for emerging RF front-end chains of new wireless systems (e.g., 5G and beyond) in terms of energy-efficiency/DC-power-saving, overall size/volume, and cost. A more-efficient solution that is recently gaining considerable research attention may be the exploitation of “reflectionless” RF passive devices, where the out-of-band signal energy is dissipated inside the circuit instead of being reflected back to the source so that RF isolators are no longer needed. ![]() Whereas passive and active RF isolators avoid this problem, this is done at the expense of higher size/volume and increased DC power consumption, respectively, and higher cost. Indeed, such RF signal-power reflections may induce RF amplifiers to operate in the non-linear regime or to create additional undesired mixing products in frequency-conversion stages. RF isolators are usually employed in RF front-end chains to prevent active stages to be damaged by the presence of RF signal-power reflections created by the passive stages (e.g., RF bandpass filters) in their stopband regions. ![]() View past and registration opens two weeks prior to presentation. ![]()
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