Method for increasing the sensitivity of integrated circuit...

Details Method for increasing the sensitivity of integrated circuit... Method for increasing the sensitivity of integrated circuit...

2005-09-27

2005-09-27

Zweizig, Jeffrey (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

External effect

Temperature

Reexamination Certificate

active

06949968

ABSTRACT:
A method and apparatus are arranged to provide increased sensitivity for a temperature sensor in an integrated circuit such that the accurate temperature sensing is achieved over a broad temperature range. A temperature sense signal from a VPTAT circuit is coupled to a level shifter to provide a level shifted signal. The level shifted signal is coupled to a gain block to provide an output signal with increased signal amplitude. The output signal is fed to an analog-to-digital converter (ADC) that is in communication with control logic. The control logic dynamically adjusts at least one parameter associated with the level shifter circuit and/or the gain block to maximize the dynamic range associated with the temperature sense signal.

REFERENCES:
patent: 3790910 (1974-02-01), McCormack
patent: 5140302 (1992-08-01), Hara et al.
patent: 5436614 (1995-07-01), Torikoshi et al.
patent: 6392582 (2002-05-01), Nakamura
patent: 6614373 (2003-09-01), Frazier
“LM34/LM35 Precision Monolithic Temperature Sensors,” Application Note 460-Oct. 1986,National Semiconductor Corporation,(13 pages).
“Temperature Sensor Handbook,”National Semiconductor CorporationDec. 1994-Oct. 1997, (40 pages).
“High-Slope, Low-Power, Analog Temperature Sensor in an SC70 Package,”Maxim Integrated products, 2002(5 pages).

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