Micropower incremental analog-to-digital converters Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/hh63sz808

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  • Incremental ADCs (IADCs) have many advantages for low-frequency high-accuracy data conversion—they are easy to multiplex between channels, need simpler digital decimation filter, and allow extended counting with a Nyquist-rate ADC. A single-loop incremental ADC was designed and fabricated in 90 nm for a biosensor interface circuit. It incorporates one integrator, and uses noise-coupling technique to achieve second-order noise-shaping. The use of feed-forward coupling and multi-bit internal quantizer allows low swing at the integrator, and hence low-power operation. The measured SNR is 74 dB within a signal bandwidth 2 kHz, and a 14 μW power consumption. A new two-step IADC was proposed for 250 Hz bandwidth sensor interface circuits. It extends the order of a conventional incremental ADC from N to (2N-1) by way of a two-step operation. However, it only needs the same circuitry as the Nth-order IADC. A second-order loop filter was designed and fabricated by 2.5V I/O devices in 65 nm to demonstrate this concept to achieve third-order noise-shaping performance. Operated at sampling frequency 96 kHz, the measured dynamic range is 99.8 dB relative to a maximum input 2.2 VPP. The measured maximum SNDR was 91 dB with a 2.2 V[subscript PP] input amplitude. The ADC core area is 0.2 mm², and the IADC consumed only 11.7 μW. A new incremental ADC with multi-step extended-counting was proposed for sensor interface conversion. A 1st-order feedforward modulator was used for the coarse conversion, and the residue voltage was quantized by re-using the modulator for the fine conversion. Then, the circuit was re-configured as a counting ADC to quantize the residue voltage. The three steps of the circuits perform 15-bit quantization by 5-bit/step. A first-order IADC could only achieve 6.6-bit performance within the same conversion time of 96 clock periods. Reusing the first-order circuits, extra 8.4-bit is thus achieved.
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  • description.provenance : Submitted by Chia-Hung Chen (chenchia@onid.orst.edu) on 2013-12-05T17:50:51Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5) ChenChiaHung2013.pdf: 3744669 bytes, checksum: b3d97d570c0769224df9c07c1a8745c6 (MD5)
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  • description.provenance : Rejected by Julie Kurtz(julie.kurtz@oregonstate.edu), reason: Your ScholarsArchive@OSU submission has been rejected because you attached a CC0 or Public Domain License to your work. These licenses mean that you have "dedicated the work to the public domain by waiving all of your rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. Others can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission." We strongly suggest that you don't attach either of these licenses. We're assuming you probably meant to add a Creative Commons license to your work so that others could use it, but you intended to retain your copyrights. Please re-submit* your work and choose "Creative Commons License" from the License Type drop down box. You'll then be asked two questions about how you want people to use your work. You can also choose "No Creative Commons License". *To re-submit your work, log into ScholarsArchive@OSU. Your rejected submission will be in your Submissions & Tasks work file. You can just resume the submission. All your information will still be in the form; you need to change only the CC License page. Thanks, Julie on 2013-12-05T16:51:27Z (GMT)
  • description.provenance : Submitted by Chia-Hung Chen (chenchia@onid.orst.edu) on 2013-12-04T00:44:15Z No. of bitstreams: 2 license_rdf: 1089 bytes, checksum: 0a703d871bf062c5fdc7850b1496693b (MD5) ChenChiaHung2013.pdf: 3744669 bytes, checksum: b3d97d570c0769224df9c07c1a8745c6 (MD5)
  • description.provenance : Approved for entry into archive by Laura Wilson(laura.wilson@oregonstate.edu) on 2013-12-05T22:05:46Z (GMT) No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5) ChenChiaHung2013.pdf: 3744669 bytes, checksum: b3d97d570c0769224df9c07c1a8745c6 (MD5)
  • description.provenance : Made available in DSpace on 2013-12-05T22:05:46Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: bb87e2fb4674c76d0d2e9ed07fbb9c86 (MD5) ChenChiaHung2013.pdf: 3744669 bytes, checksum: b3d97d570c0769224df9c07c1a8745c6 (MD5) Previous issue date: 2013-11-25

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