Advanced Production Testing of RF, SoC, and SiP Devices by Joe Kelly

By Joe Kelly

That includes useful enter from industry-leading businesses and highly-regarded specialists within the box, this first-of-its style source deals skilled engineers a accomplished knowing of the complex themes in RF, SiP (system-in-package), and SoC (system-on-a-chip) creation checking out which are serious to their paintings related to semiconductor units. The e-book covers key dimension ideas for semiconductor gadget trying out and assists engineers in explaining those thoughts to administration to help cut back undertaking price, time, and assets. in keeping with real-world adventure and filled with time-saving equations, this in-depth quantity deals execs useful info on crucial issues that experience by no means been provided in one reference ahead of.

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The key items within a PLL/VCO circuit that are tested in production are the N or R dividers, the VCO, and the response time of the PLL circuit. Although direct access to the dividers is not necessary for normal operation of the PLL, on some devices, the output of the N divider is routed to the package to allow testing of the divider output. Because of the increase of multiple chips in a single package and the limitations on available package pins, this is becoming less common. To test the VCO for proper operation, either VCO gain (KVCO) or direct RF frequency measurement is performed.

Reference [3] gives an excellent overview of how RF power is defined. It is important for the test engineer to understand the concept of measuring and applying RF power in dBm. The dBm unit is another example of translating unitless numbers into the logarithmic scale. The letter m indicates that the RF power is referenced to 1 mW. 15) When RF power is measured, it is important to specify the measurement bandwidth. The higher the measurement bandwidth specified, the larger the frequency band that can be measured.

Another key parameter on top of the gain measurement is the gain flatness of the device. For instance, a Bluetooth device works over a bandwidth of 100 MHz. 499 GHz. The maximum allowed gain deviation over frequency is called gain flatness. In the preceding example of a Bluetooth transmitter, the typical gain flatness would be specified as, for instance, 1 dB. That means that if the gain over the whole 100-MHz band is observed, the difference between the highest gain and the lowest gain must not be more than 1 dB.

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