Invention Grant
- Patent Title: Capacitance-to-digital converter
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Application No.: US15827530Application Date: 2017-11-30
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Publication No.: US10014879B1Publication Date: 2018-07-03
- Inventor: Ramin Zanbaghi , John L. Melanson
- Applicant: Cirrus Logic International Semiconductor Ltd.
- Applicant Address: US TX Austin
- Assignee: Cirrus Logic, Inc.
- Current Assignee: Cirrus Logic, Inc.
- Current Assignee Address: US TX Austin
- Agency: Jackson Walker L.L.P.
- Main IPC: H03M1/10
- IPC: H03M1/10 ; H03M3/00 ; G01R27/26 ; H03M1/12 ; G01R19/25

Abstract:
A method for measuring capacitance may include integrating charge with a charge integrator having a charge integrator input and output, filtering, with a loop filter having a loop filter input coupled to the charge integrator output and having a loop filter output, a first signal generated at the charge integrator output, quantizing, with quantizer having a quantizer input coupled to the loop filter output and a having quantizer output, a second signal generated at the loop filter output, processing, with a first feedback path having a first feedback path input coupled to the quantizer output and a first feedback path output coupled to the charge integrator input, a low-frequency spectrum of a quantizer output signal, and processing, with a second feedback path having a second feedback path input coupled to the quantizer output and a second feedback path output coupled downstream in a signal path of the apparatus relative to the charge integrator, a high-frequency spectrum of the quantizer output signal.
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