Magnetic sensor circuit and semiconductor device capable of...

Details Magnetic sensor circuit and semiconductor device capable of... Magnetic sensor circuit and semiconductor device capable of...

2008-05-20

2008-05-20

Patidar, Jay M (Department: 2862)

Electricity: measuring and testing

Magnetic

Magnetometers

C324S225000, C324S260000

Reexamination Certificate

active

11315359

ABSTRACT:
A magnetic sensor circuit supplying an excitation current to an MI device, and having a detection signal supplied thereto corresponding to a magnetic field intensity from the MI device based on the excitation current. The magnetic sensor circuit includes a pulse current supplying circuit supplying a pulse current to the MI device; a sample-and-hold circuit maintaining an approximately peak value of the detection signal and outputting a hold signal; and a temperature compensation part compensating temperature characteristics of the magnetic sensor circuit with respect to the hold signal. The sample-and-hold circuit may include a switching circuit and a holding capacitor. The switching circuit may have an opening/closing control signal supplied thereto based on timing of the pulse current. The temperature compensation part may include a temperature detection circuit, a temperature compensation circuit, and an amplification circuit that has an amplification factor higher than that of the temperature compensation circuit.

REFERENCES:
patent: 4954776 (1990-09-01), Husher
patent: 5182953 (1993-02-01), Ellinger et al.
patent: 6529007 (2003-03-01), Ott et al.
patent: 7210236 (2007-05-01), Sato et al.
patent: 2007/0114988 (2007-05-01), Rossmann et al.
patent: 2000-019235 (2000-01-01), None
patent: 2004-119517 (2004-04-01), None
Honkura et al, ‘MI Sensor-based Electronic Compass for Mobile Phone Applications’, The Magnetic Society of Japan, (2003), vol. 27, No. 11, pp. 1063-1068.

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