Sensor calibration

• US 6,304,827 B1
• Filed: 09/16/1999
• Issued: 10/16/2001
• Est. Priority Date: 09/16/1999
• Status: Expired due to Term

• Current Assignee: Infineon Technologies AG
• Original Assignee: SensoNor ASA (Infineon Technologies AG)
• Inventors: Blixhavn, Bjørn, Grinde, Helge
• Primary Examiner(s): Gutierrez, Diego
• Assistant Examiner(s): Gonzalez, Madeline
• Application Number:
  US09/397,530
• Time in Patent Office: 761 Days
• Field of Search: 337/02, 337/06, 337/07, 337/08, 374/142, 702/99, 702/104, 73/18.8, 73/16.1
• US Class Current: 702/104
• CPC Class Codes: G01D 3/022 having an ideal characteristic, map or correction data stored in a digital memory

Abstract

A device for compensating for temperature dependent effects on an electronic sensor output signal. The device is capable of receiving a digital output signal from an electronic sensor and receiving a digital output signal from an electronic sensor and receiving a digital signal indicative of the temperature of the sensor. The device produces an output signal dependent upon the received sensor and temperature signal and based upon the compensation polynomial H(V,T), where: $H\left(V,T\right)=\frac{1}{G·S_0}\left[V·\left(1+\sum _{i=1}^mS_iT^i\right)-Z_0-\sum _{j=1}^nZ_jT^j\right]$

where T is temperature, V is the output of the sensor, G is a gain value, S₀ is the sensitivity at a fixed value of T=0,Z₀ is the sensor offset voltage at a value of T=0,S_i is the i^th order coefficient of sensitivity temperature drift, Z_j is the j^th order coefficient of offset temperature drift and m and n are integers, S_m and Z_n being the highest order coefficients. A corresponding method of generating a temperature compensated signal is also provided.

Claims

1. A device for compensating for temperature dependent effects on an electronic sensor output signal, the device comprising:

a first means for receiving a digital output signal from an electronic sensor;

a second means for receiving a digital signal indicative of the temperature of the sensor and for producing an output signal dependent upon the sensor signal received from the first means and the temperature signal and based upon a compensation polynomial H(V,T), where;

$H<br><br>\left(V,T\right)=\frac{1}{G·<br><br>S_0}<br><br>\left[V·<br><br>\left(1+\underset{i=1}{\overset{m}{\sum <br><br>}}<br><br>\text{\hspace{1em}<br><br>}<br><br>S_i<br><br>T^i\right)-Z_0-\underset{j=1}{\overset{n}{\sum <br><br>}}<br><br>\text{\hspace{1em}<br><br>}<br><br>Z_j<br><br>T^j\right]$

where T is temperature, V is the output of the sensor, G is a gain value, S₀ is the sensitivity at a fixed value of T=0, Z₀ is the sensor offset voltage at a value of T=0, S_i is the i^th order coefficient of sensitivity temperature drift, Z_j is the j^th order coefficient of offset temperature drift and m and n are integers, S_m and Z_n being the highest order coefficients.

2. A device according to claim 1, wherein m=n.

3. A device according to claim 2, wherein n=2.

4. A device according to claim 1, wherein at least one of m and n>

=3.

5. A device according to any preceeding claim, formed as an integral part of the sensor.

6. A device according to claim 5 formed as part of an ASIC.

7. A method of compensating for temperature dependent effects on an electronic sensor output signal, the method comprising:

providing a signal receiving and producing means that is operably connected to an electronic sensor;

receiving a digital output signal from the electronic sensor;

receiving a digital signal indicative of the temperature of the sensor; and

producing an output signal dependent upon the received sensor and temperature signals and based upon a compensation polynomial H(V,T), where;

$H<br><br>\left(V,T\right)=\frac{1}{G·<br><br>S_0}<br><br>\left[V·<br><br>\left(1+\underset{i=1}{\overset{m}{\sum <br><br>}}<br><br>\text{\hspace{1em}<br><br>}<br><br>S_i<br><br>T^i\right)-Z_0-\underset{j=1}{\overset{n}{\sum <br><br>}}<br><br>\text{\hspace{1em}<br><br>}<br><br>Z_j<br><br>T^j\right]$

where T is temperature, V is the output of the sensor, G is a gain value, S₀ is the sensitivity at a faxed value of T=0, Z₀ is the sensor offset voltage at a value of T=0, S_i is the i^th order coefficient of sensitivity temperature drift, Z_j is the j^th order coefficient of offset temperature drift and m and n are integers, S_m and Z_n being the highest order coefficients.

8. A method according to claim 7, wherein m=n.

9. A method according to claim 8, wherein n=2.

10. A method according to claim 7, wherein at least one of m and n>

=3.