IQ Calibration

TX RSB Improvement by IQ Calibration Residual sideband suppression (RSB) is one of key TX specs. We want to minimize this because this degrades EVM (when LO is centered to CC leading to signal and its image falling on top of each other) or degrades ACLR (when LO is not centered to CC leading to different signal […]

LO Leakage in TX

LO Leakage in TX LO leakage suppression is one of key TX specs. We want to minimize this because this is just like another distortion to your signal which either degrades EVM if LO is parked at the center of signal or degrades ACLR if LO is parked sideways. There are four main ways LO […]

Semiconductor Yield Estimation

CPK to Sigma conversion for semiconductor yield estimation

Semiconductor Yield Estimation Say you have an amplifier with Gain spec of x dB and you want to understand how many chips will pass this spec. What do you do? You measure all the parts you have, count the parts where gain fell below x dB and divide it to total number of parts, and […]