Patent ID: 8284624
Filing Date: 2012-10-09
Classification: G01R,G11C,H03K

Abstract:
1. A level detector, comprising: a differential amplifying unit configured to output a differentially amplified comparative voltage at a second node in response to a voltage at a first node that varies based upon a difference between a reference voltage and a sensed voltage; and a temperature coefficient adjustment unit configured to control current that flows through the first node in response to a variable voltage having a level that varies with temperature, and to control current that flows through the second node in response to a fixed voltage having a level that does not vary with temperature, wherein the differential amplifying unit comprises: a reference voltage generator configured to receive an external constant voltage and to output the reference voltage; a sensed voltage generator configured to output the sensed voltage in response to an input voltage; and a differential amplifier that is driven by a first current source and configured to output a voltage at the second node that varies based upon the voltage at the first node, as the differentially amplified comparative voltage, wherein the reference voltage and the sensed voltage do not vary with temperature.