By Joe Kelly
That includes priceless enter from industry-leading businesses and highly-regarded specialists within the box, this first-of-its type source bargains skilled engineers a complete knowing of the complex issues in RF, SiP (system-in-package), and SoC (system-on-a-chip) construction checking out which are serious to their paintings concerning semiconductor units. The booklet covers key size options for semiconductor gadget checking out and assists engineers in explaining those strategies to administration to help cut back undertaking expense, time, and assets. in keeping with real-world adventure and full of time-saving equations, this in-depth quantity bargains pros functional info on crucial subject matters that experience by no means been awarded in one reference earlier than.
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Additional info for Advanced Production Testing of RF, SoC, and SiP Devices
Pfundamental is the power of the desired fundamental signal. 13b) where V2, V3, V4, … are the voltage amplitudes of the second, third, fourth, and so on harmonics, respectively. Vfundamental is the voltage amplitude of the desired Tests and Measurements II: Distortion 41 fundamental signal. In either case, an ideal device with no distortion would have 0% THD. If a measurement receiver, or digitizer, does not have adequate bandwidth, THD measurements are measured by making several simple power measurements because the fundamental and harmonic frequencies are often far apart.
The incoming RF signal is first downconverted to an intermediate frequency (IF). This allows image suppression and channel selection by filtering out any unwanted signals. The filtering is commonly accomplished by use of surface acoustical wave (SAW) or ceramic filters. The filtered IF signal is then further downconverted to the baseband frequency, which is then digitized and demodulated in a DSP. Because the radio has two stages of downconversion, it is generally more complex and more expensive due to the extra components such as discrete SAW filters and voltage-controlled oscillator (VCO)/synthesizers.
1 Total Harmonic Distortion A standardized measure of harmonic distortion is total harmonic distortion (THD). THD is the relative power contained in all harmonics of a signal expressed as a percent of the fundamental signal power. It is a measure of how well the device converts energy to the desired fundamental signal versus the undesired harmonic signals. Harmonic distortion is specified (and tested) at a specified output power of the DUT. 13a) where P2, P3, P4, … are the power, in watts, of the second, third, fourth, and so on harmonics, respectively.