Patent ID: 7034598
Filing Date: 2006-04-25
Classification: G01R

Abstract:
1. A switching point detection circuit for detecting a switching point according to a fabrication condition of a metal oxide semiconductor (MOS) transistor, the switching point detection circuit comprising: a reference voltage generation circuit for generating a reference voltage; a first inverter for inverting the reference voltage to generate a first output the first inverter having a first p-type metal oxide semiconductor (PMOS) transistor and a first n-type metal oxide semiconductor (NMOS) transistor, wherein a gate of the first PMOS transistor is coupled to a gore of the first NMOS transistor; and a second inverter for inverting the reference voltage to generate a second output, the second inverter having a second PMOS transistor and a second NMOS transistor, wherein a gate of the second PMOS transistor is coupled to a gate of the second NMOS transistor; a first differential amplifier for receiving the first reference voltage and the first output of the first inverter circuit; and a second differential amplifier for receiving the second reference voltage and the second output of the second inverter circuit, wherein the first NMOS transistor is dominant over the first PMOS transistor and the second PMOS transistor is dominant over the second NMOS transistor according to the fabrication condition and a logic level of the first output and a logic level of the second output provides a determination of the fabrication condition.