Patent ID: 7863981
Filing Date: 2011-01-04
Classification: H03F

Abstract:
1. An operational amplifier, comprising: a first input module, comprising a first pair of input transistors and a first pair of output transistors, each of the first pair of input transistors having a first threshold voltage; a second input module, comprising a second pair of input transistors and a second pair of output transistors, each of the second pair of input transistors having a second threshold voltage, the second threshold voltage being lower than the first threshold voltage, wherein each of the first pair of output transistors has a bulk in communication with a respective one of the first pair of input transistors, and each of the second pair of output transistors has a bulk in communication with a respective one of the second pair of input transistors, and each input module is configured to: a protection module, in communication with the first input module, and configured to generate a protection control signal as a function of at least one of the pair of input signals, wherein each of the pair of output signals generated by the first pair of output transistors has an amplitude that is at least partially controlled as a function of the protection control signal.