公开(公告)号：US10317482B2

公开(公告)日：2019-06-11

申请号：US15356561

申请日：2016-11-19

Applicant: NXP B.V.

Inventor： Marijn Nicolaas Van Dongen ,  Edwin Schapendonk ,  Selcuk Ersoy

IPC: G01R33/09 ,  H03M3/00

Abstract: A resistive sensor includes a current input sigma-delta converter that uses a switched offset voltage source to provide scalable gain and more linear operation. The sigma-delta converter includes an integrator, a quantizer, and a decimator. In one embodiment, the resistive sensor and offset voltage source are coupled to provide an input current at a first node. The integrator has a first input terminal coupled to the first node, and an output terminal. The quantizer has a first input terminal coupled to the output terminal of the integrator, a second input terminal for receiving a clock signal, and an output terminal coupled to provide a feedback signal to control the offset voltage source. The decimator has an input terminal coupled to the output terminal of the quantizer, and an output terminal for providing an output signal. The switched offset voltage source provides scalable gain and good linearity.