Innosilicon PVT Sensor IP consists of SAR ADC, bandgap circuit, oscillator, and digital logic. The SAR ADC is a successive approximation analog-to-digital converter. The bandgap circuit produces an accurate reference voltage for the SAR ADC. It also produces a voltage with a certain temperature coefficient. This temperature-related voltage or external input voltage is sampled by the SAR ADC and converted to digital signal. The oscillator generates a clock for process corner detection. The digital logic receives clock and control signals from SoC, and then it outputs measurement results to SoC.