Patent ID: 6977532
Filing Date: 2005-12-20
Classification: H03K,H04L

Abstract:
1. A differential comparator circuit for receiving an input voltage within a pre-determined range, amplifying said input voltage into an output voltage, and outputting said output voltage, wherein said range comprises a first range portion and a second range portion, and said input voltage ranged in said first range portion is higher than that ranged in said second range portion, comprising: a first differential comparator for receiving and amplifying said input voltage within said first range portion, and outputting said output voltage, comprising: a shared active load for amplifying said input voltage received by said first differential comparator and generating said output voltage; a detecting circuit electrically connected to said first differential comparator for producing a trigger signal when said detecting circuit detects that said first differential comparator is shut down due to the fact that said input voltage is lower than a lower-limit of said first range portion; and a second differential comparator electrically connected to said detecting circuit and said shared active load for receiving and amplifying said input voltage within said second range portion, and outputting said output voltage in response to said trigger signal respectively.