High-accuracy circuits for on-chip capacitor ratio testing and sensor readout Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/bc386m432

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  • The precise measurement of a capacitance difference or ratio in a digital form is very important for capacitive sensors, for CMOS process characterization as well as for the realization of precise switched-capacitor data converters, amplifiers and other circuits utilizing ratioed capacitors. This thesis introduces design techniques for on-chip capacitor ratio testing and sensor readout that utilize sigma-delta modulation and integrate the sensor capacitors into the modulator. Several single-ended circuits are introduced, and the correlated-double-sampling (CDS) technique is used in the circuits to reduce the non-ideal effects of opamps. Several simple calibration schemes for clock-feedthrough cancellation are also introduced and discussed. A fully-differential implementation is also described and various common-mode feedback schemes are discussed and analyzed. Simulation and experimental results show that these circuits can provide extremely accurate results even in the presence of non-ideal circuit effects such as finite opamp gain, opamp input offset and noise, and clock-feedthrough effect from the switches. To verify the effectiveness of the circuits and simulations, two prototype chips containing a single-ended realization and a fully-differential one were designed and fabricated in a 1.2 μm CMOS technology. Two off-chip mica capacitors were used in the test circuits, and the measured results show that very accurate results can be obtained using these circuit techniques even with off-chip noise coupling and large parasitic capacitances.
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  • File scanned at 300 ppi (Monochrome, 256 Grayscale) using Capture Perfect 3.0.82 on a Canon DR-9080C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-09-07T18:37:39Z (GMT) No. of bitstreams: 1 WangBo1999.pdf: 5813766 bytes, checksum: 1522031676678b47a42a03d7c33ef90e (MD5)
  • description.provenance : Submitted by Erin Clark (ecscannerosu@gmail.com) on 2012-09-07T18:08:03Z No. of bitstreams: 1 WangBo1999.pdf: 5813766 bytes, checksum: 1522031676678b47a42a03d7c33ef90e (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-09-07T18:36:40Z (GMT) No. of bitstreams: 1 WangBo1999.pdf: 5813766 bytes, checksum: 1522031676678b47a42a03d7c33ef90e (MD5)
  • description.provenance : Made available in DSpace on 2012-09-07T18:37:39Z (GMT). No. of bitstreams: 1 WangBo1999.pdf: 5813766 bytes, checksum: 1522031676678b47a42a03d7c33ef90e (MD5) Previous issue date: 1998-11-06

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