Silicon Substrate Surface Conduction and Dielectric Passivation Fundamentals
Trap-rich polysilicon passivation pins interface charges on high-resistivity silicon, suppressing surface conduction and harmonic spur spikes across RF switches.
RF Probe Station Metrology
Meaning
Wafer-level measurement science provides the tools and techniques required to characterize semiconductor devices at microwave and millimeter-wave frequencies. Precision in rf probe station metrology ensures that the measurements taken directly on the silicon die are accurate and repeatable. This process is used to validate the performance of new integrated circuit designs before they are packaged.
Planar Calibration
Correcting for the effects of the probes and cables requires the use of standard reference structures on a specialized substrate. In rf probe station metrology, these standards allow the system to move the measurement reference plane to the very tips of the probes. This step removes the parasitic capacitance and inductance that would otherwise mask the true behavior of the device.
Contact Repeatability
Maintaining a consistent electrical connection between the probe tips and the aluminum or copper pads is a constant challenge. Rf probe station metrology systems use high-resolution cameras and precision motors to control the pressure and the position of the probes. Stable contact ensures that the measured gain and phase values do not fluctuate between different test sites.
Signal Recovery
Detecting the true signal from a device requires the suppression of noise and unwanted reflections within the test setup. Advanced rf probe station metrology techniques use vector network analyzers and frequency extenders to capture data up to hundreds of gigahertz. The resulting data is used to create accurate models for the design of the next generation of connectivity modules.