Sensor and sigma-delta converter

Details Sensor and sigma-delta converter Sensor and sigma-delta converter

2005-05-03

2005-05-03

Le, N. (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

With auxiliary means to condition stimulus/response signals

C324S444000

Reexamination Certificate

active

06888358

ABSTRACT:
A sensor for determining at least one parameter with a sigma-delta converter (1) comprises switched input capacitors and feedback capacitors (Cf1,Cf2,Crefc1,Crefc2,Creff1,Creff2,Crt1,Crt2,Cr1,Cr2,Ctemp1,Ctemp2,Cs1,Cs2). At least one of the capacitors is designed such that its capacitance depends on the parameter to be determined. In this way, the change of capacitance can be directly determined by means of the sigma-delta converter. Due to a symmetric design of the converter a higher accuracy can be reached.

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