Invention Grant
- Patent Title: Frequency selective charge amplifier to attenuate common mode interferers
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Application No.: US16255529Application Date: 2019-01-23
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Publication No.: US10691255B1Publication Date: 2020-06-23
- Inventor: Fang Lin , Tom W. Kwan , Feng Su
- Applicant: Avago Technologies International Sales Pte. Limited
- Applicant Address: SG Singapore
- Assignee: AVAGO TECHNOLOGIES INTERNATIONAL SALES PTE. LIMITED
- Current Assignee: AVAGO TECHNOLOGIES INTERNATIONAL SALES PTE. LIMITED
- Current Assignee Address: SG Singapore
- Agency: Xsensus LLP
- Main IPC: G06F3/041
- IPC: G06F3/041 ; H03F3/45 ; G06F3/044

Abstract:
Frequency selective analog front-end circuitry, used to convert a sensed charge signal to an analog voltage is disclosed. In one aspect, the frequency selective analog front-end circuitry includes an op-amp having an output, an inverting input and a noninverting input, a first resistor connected between the terminal of the first capacitor and the inverting input of the op-amp, a second capacitor connected between the output of the op-amp and the inverting input of the op-amp, a second resistor connected between the output of the op-amp and the inverting input of the op-amp, a third capacitor connected between the terminal of the first capacitor and the noninverting input of the op-amp, and a third resistor connected between the noninverting input of the op-amp and a reference voltage.
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