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RF Switch High Quality Reliability
- Oct 27, 2017 -

RF Switch  can send signals efficiently within the transmission path. The functions of such switches can be characterized by four basic electrical parameters.

Although multiple parameters are related to the performance of RF Switch , the following four parameters are considered critical due to their strong correlation: isolation, insertion loss, switching time, and power handling capability.

The degree of isolation between the circuit input and the output is the measure of the effectiveness of the cut-off. The insertion loss (also called transmission loss) is the total power dissipation when the switch is in the on state. Since the insertion loss can directly lead to an increase in the system noise figure, the insertion loss is the most critical parameter for the designer.

The switching time is the time required for the switch to transition from the "on" state to the "off" state and from the "off" state to the "on" state. The time up to the number of high-power switch microsecond, down to the low-power high-speed switch several nanoseconds. The most common definition of switching time is the time required for the input control voltage to reach 50% of its final RF output power to 90%. In addition, the power handling capability is defined as the maximum RF input power that the switch can withstand without any permanent electrical performance degradation.

RF Switch can be divided into electromechanical relay switches and solid state switches two categories. These switches can be designed for a variety of different configurations - from single-pole single-throw to single-pole, six-throw,RF Switch  or more-throw configurations that can convert a single input into 16 different output states. The switch is a double pole and double throw configuration switch. This type of switch has four ports and two possible switch states, which allow the load to switch between the two sources.

The electromechanical relay switch has a low insertion loss (<0.1dB), high isolation (> 85dB), and can switch signals at milliseconds. The main advantage of this type of switch is that it can operate in the DC-millimeter wave (> 50 GHz) frequency range and is insensitive to electrostatic discharge. In addition,RF Switch  the electromechanical relay switch can handle high power levels (up to several kilowatts of peak power) and does not cause video leakage.

However, there are some issues worthy of our attention in the operation of electromechanical RF switches. The standard service life of these switches is only about 1 million times, and its components are more sensitive to vibration. The service life is the number of times the electromechanical switch can complete the RF and repeatability requirements. High quality or high reliability Electromechanical switches are ideal for applications where longer service life is required. The reliability and other performance of this type of switch is extremely superior, and the service life of up to 10 million times. The longer service life comes from the design of a more robust actuator and a more optimized drive link in terms of magnetic efficiency and mechanical rigidity. In addition,RF Switch  such switches are designed to withstand harsher environmental conditions and meet the requirements of the MIL-STD-2002 standard for both sinusoidal and random vibration and mechanical shocks.

In general, compared with the electromechanical switch, solid-state RF switch reliability, longer life, faster switching speed. Therefore, in applications requiring higher switching speed and reliability, solid-state RF switches should be prioritized. Electromechanical switches are preferred in applications requiring low bandwidth to low DC and low insertion losses. With long service life In applications where absolutely required, high reliability switches are preferred.

Another important feature of electromechanical RF switches is its armature relay mechanism. When the coil is energized, the induced magnetic field will cause the armature coil to move, thereby opening or closing the contacts. The non-latching switch is provided with a spring or magnet which maintains the switch in an initial normally closed state when the current does not flow. This type of switch is suitable for applications where the switch must be restored to a known state when the power is interrupted.