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Introduction of RF Pogo pin test seat

RF Pogo pin

1, RF test seat definition

RF test seat is composed of several parts, the first is the test seat housing + test seat Pogo pin+RF coaxial connector.
Most of the structure of the RF test seat is similar to that of an ordinary test seat, except for the part of the coaxial connector.
As for the part of the test seat, the design idea has also been explained before.
Now let's talk about RF pogo pin connectors.
RF Pogo pin connector RF Pogo pin connector, which is used to communicate radio frequency. Through the joint efforts of the global communication industry, RF Pogo pin connector has formed a professional system and international standards, and is also an essential part of the connector.

2, the working principle of RF test seat
RF radio frequency test a regular pin foot still adopt the corresponding pogo pin probe, but due to radio frequency signals, need special medium, so the corresponding CONNECTOR part is very special, we compare the common RF COAXIAL CONNECTOR, RF COAXIAL CONNECTOR) is one of them, This component will be embedded in the test seat for RF conduction during testing.
For the design of the RF connector in the corresponding test seat, please refer to the following (not limited to the following interfaces). At the same time, when customizing the test seat, it is also necessary to propose the insertion loss and loss back requirements of the chip to the supplier (namely, S12/S21 and S11), as well as the contact impedance requirements:
BNC is bayonet type, mostly used for less than 4GHz RF connection, widely used in instrument and computer interconnection.
TNC is threaded connection, size and other aspects similar to BNC, operating frequency up to 11GHz, threaded suitable for vibration environment.
SMA is threaded connection, the most widely used, impedance of 50 and 75 ohm two, 50 ohm with flexible cable frequency less than 12.4Ghz, with semi-rigid cable up to 26.5GHz.
SMB, smaller than SMA, is inserted into a self-locking structure for fast connection and is often used for digital communication. It is a replacement for L9, with 50 ohms up to 4GHz and 75 ohms up to 2GHz.
SMCS are threaded connections, while others like SMBS have a wider frequency range and are commonly used in military or high vibration environments.
N-type connector is thread type, with air as insulation material, low cost, frequency up to 11GHz, often used in test instruments, there are 50 and 75 ohm two kinds.
MCX and MMCX connectors are small and are used for intensive connections.
Bmas are used for blind plug connections of low power microwave systems with frequencies up to 18GHz.

3, the application of RF test seat
At present, with the upgrade of high-speed communication standards such as 5G and WIFI6, new RF chips are widely used in mobile devices such as mobile phones, tablets, and communication base stations. RF RF test seat has more and more demands. Currently, the main RF chips will use aging test, functional test, and special test in extreme environment, so the RF test seat also puts forward higher testing requirements.

4, RF test seat production method:
Product design needs to rely on data, including chip size (length, width and thickness), chip spacing, chip shape, chip operation frequency in chip test, and corresponding plug loss, loss and other data. Some RF chips have large power and may need to provide overcurrent demand. As is known to all, the overcurrent capacity of the test seat pogo pin is less than 1A, so the overcurrent capacity of the chip's power pin also needs to be taken into account, otherwise it will affect the test data of the chip's full power on.
Socket + RF coaxial connector (isolation also needs to be considered)

5, RF test seat maintenance:
The RF test seat needs regular maintenance. It is best to check the contact with Pogo pin or RF connector with a microscope every 5000 times to check whether there is dirt on the top of the needle and the wear condition of the needle to ensure that the test seat is always in good test condition. If there is dirt, it is recommended to use ultrasonic cleaning equipment, put high purity alcohol for ultrasonic cleaning, and then use air gun to do the final cleaning, to ensure that the test seat in a dry state, to ensure the service life of the product and test performance. If there is a slight wear, does not affect the test (that is, the test data does not have a large error), can continue to use after cleaning. If the damage is serious, you need to replace the probe and RF Pogo pin connector to continue to use.


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