Circuit arrangement to adjust and calibrate a MEMS-sensor...

Details Circuit arrangement to adjust and calibrate a MEMS-sensor... Circuit arrangement to adjust and calibrate a MEMS-sensor...

2009-02-11

2011-12-13

Smith, R. A. (Department: 2841)

Thermal measuring and testing

Thermal calibration system

C374SE15001, C073S001340, C073S204110

Reexamination Certificate

active

08075178

ABSTRACT:
Circuitry is disclosed for the calibration of heating element and ambient temperature sensors, comprising: a) an amplifier having positive and negative inputs, and an output; b) one or more heating MOS transistors selectably coupled in parallel and having 1) a heating transistor drain coupled to the positive input of the amplifier; 2) a heating transistor source configured to receive a supply voltage; and 3) a heating transistor gate coupled to the amplifier output; c) one or more ambient MOS transistors selectably coupled in parallel and having 1) an ambient transistor drain, 2) an ambient transistor gate coupled to the amplifier output; and 3) an ambient transistor source configured to receive the supply voltage; d) a temperature difference resistance configured: 1) to be coupled at least partially between an ambient connection and the ambient transistor drain; and 2) to be coupled at least partially between the ambient connection and the negative input of the amplifier.

REFERENCES:
patent: 3992940 (1976-11-01), Platzer, Jr.
patent: 6763710 (2004-07-01), Mayer et al.
patent: 7010971 (2006-03-01), Matsumoto et al.
patent: 7102417 (2006-09-01), Gordon et al.
patent: 7401510 (2008-07-01), Ando
patent: 1541974 (2005-06-01), None
patent: 1696215 (2006-08-01), None
patent: 2088402 (2009-08-01), None

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