Current sense amplifier with an extended common mode input voltage range

摘要

A current sense amplifier having an extended common mode input voltage range, comprising: a low voltage (LV) p-type metal oxide semiconductor (PMOS) input module coupled to a positive supply rail, the positive supply rail providing a voltage equal to the maximum between one applied to the amplifier positive input signal (IN +) voltage and an internal power supply voltage, and a voltage regulator coupled to the positive supply rail and configured to produce a reduced voltage level relative to the positive supply rail voltage applied to the LV PMOS input module via a High voltage ground line (HV_GND) is applied, wherein at least a portion of the LV PMOS input module is powered by a voltage difference between the positive supply rail and the HV_GND line, and wherein the voltage regulator is configured to reduce the voltage difference within an operating range of one or more LV devices in the LV PMOS input module.