Invention Grant
- Patent Title: Gain programmability techniques for delta-sigma analog-to-digital converter
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Application No.: US17538187Application Date: 2021-11-30
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Publication No.: US11626885B1Publication Date: 2023-04-11
- Inventor: Shaolong Liu , Daniel Peter Canniff , Abhishek Bandyopadhyay , Akira Shikata
- Applicant: Analog Devices, Inc.
- Applicant Address: US MA Wilmington
- Assignee: Analog Devices, Inc.
- Current Assignee: Analog Devices, Inc.
- Current Assignee Address: US MA Wilmington
- Agency: Schwegman Lundberg & Woessner, P.A.
- Main IPC: H03M3/00
- IPC: H03M3/00 ; H03M1/00 ; H03M1/06 ; H03M1/12

Abstract:
An excess loop delay compensation (ELDC) technique for use with a successive approximation register (SAR) based quantizer in a continuous time delta-sigma ADC is described. The techniques can efficiently program and calibrate the ELD gain in ELD compensation SAR quantizers. An ELDC circuit can include a charge pump having a digitally programmable capacitance to adjust a gain, such as the gain of the ELDC digital-to-analog converter (DAC) or the gain of the SAR DAC.
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