RF limiters are made to limit the amount of RF power that goes into an electrical circuit. They are usually used in RF transceivers.
In a radio transceiver, the transmitter and the receiver units have the same antenna. A transmitter can generate power that varies from a small amount of milliwatts up to kilowatts, depending on how much output power the radio is capable of. The transmitter power can affect the receiver's input through reflections or leakage. Just a small amount of power from the transmitter can damage the sensitive input circuits of the radio receiver. Often, a radio receiver will have an amplifier to boost weak signals. The RF limiter protects against these ...
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RF limiters are made to limit the amount of RF power that goes into an electrical circuit. They are usually used in RF transceivers.
In a radio transceiver, the transmitter and the receiver units have the same antenna. A transmitter can generate power that varies from a small amount of milliwatts up to kilowatts, depending on how much output power the radio is capable of. The transmitter power can affect the receiver's input through reflections or leakage. Just a small amount of power from the transmitter can damage the sensitive input circuits of the radio receiver. Often, a radio receiver will have an amplifier to boost weak signals. The RF limiter protects against these possibilities by limiting the RF power it receives.
There are several types of RF limiter. The single stage RF limiter is usually made from a PIN diode in connection with an RF choke. For higher power transceivers, a multistage RF limiter will be more appropriate. This is made from a single stage RF limiter combined with extra parallel PIN diodes. A multistage RF limiter can be set so its last PIN diode will trip for even a small quantity of incidental RF power, thereby protecting the sensitive circuitry.
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