Techniques for sensing temperature and automatic calibration...

Details Techniques for sensing temperature and automatic calibration... Techniques for sensing temperature and automatic calibration...

2006-05-17

2008-08-12

Verbitsky, Gail (Department: 2855)

Thermal measuring and testing

Temperature measurement

By electrical or magnetic heat sensor

C374S170000, C327S512000

Reexamination Certificate

active

07410293

ABSTRACT:
Techniques are provided for sensing the temperature of an integrated circuit (IC). A diode is provided on an IC. The voltage across the diode varies with the temperature of the IC. A feedback loop is coupled around the diode to monitor the voltage across the diode. The feedback loop contains a comparator and logic circuitry that outputs a digital code. The digital code varies in response to changes in the diode voltage. The value of the digital code can be used to determine the temperature on the IC. Techniques are also provided for automatically calibrating a temperature sensing circuit to compensate for inaccuracies caused by variations in process, temperature, and supply voltage. A calibration circuit is added to the feedback loop in the temperature sensor. The calibration circuit generates an offset code that is used to adjust the digital code to compensate for variations in temperature, process, and supply voltage.

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