Patent ID: 7502274
Filing Date: 2009-03-10
Classification: G01K,G01N

Abstract:
1. An apparatus for sensing a target temperature, comprising: a first temperature detector for generating a first delay signal having a negative delay change with temperature; a second temperature detector for generating a second delay signal having a positive delay change with the temperature; and a comparator for sensing the target temperature from the first and second delay signals, wherein the first delay signal is generated at a first output node, and wherein the second delay signal is generated at a second output node that is not connected to the first output node, and wherein the first temperature detector includes a first inverter delay chain biased at a first voltage for causing the first inverter delay chain to have the negative delay change with temperature, and wherein the second temperature detector includes a second inverter delay chain biased at a second voltage different from the first voltage with the second voltage being for causing the second inverter delay chain to have the positive delay change with temperature.