Generation of substrate bias and current sources in CMOS technology Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/c534fs512

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  • A negatively biased substrate has several advantages over a grounded substrate in CMOS technology. The on-chip generation of this negative substrate bias has made chips easier to use when only a single supply is preferred. This project demonstrates two types of charge pump circuits used to generate negative voltages not only for biasing the substrate, but in a broader sense also for other purposes in CMOS technology. One other possible use is in conjunction with 'Guard Ring Diodes for Suppressing the Substrate Noise in Mixed-Mode CMOS Circuits'. This work proposes a reasonable approach to generate the forward biasing current for the guard ring diode whose depletion capacitance and the substrate lead inductance form a resonant circuit to provide very low substrate-to-ground impedance at specific frequencies. Given this emphasis on generating a reasonably predictable current source, the generated negative voltages are regulated using a feedback loop. The amplitude of this negative voltage can be determined exclusively by transistor sizes. Simulation results support the theoretical analysis in that accurate negative voltages and current sources can be generated on-chip, although there are some limitations.
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-10-24T16:49:53Z (GMT) No. of bitstreams: 1 ZhangJing1996.pdf: 2912464 bytes, checksum: 6c0ace399f1dd828adcb5840802c0efc (MD5)
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  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-10-24T22:39:12Z (GMT) No. of bitstreams: 1 ZhangJing1996.pdf: 2912464 bytes, checksum: 6c0ace399f1dd828adcb5840802c0efc (MD5)
  • description.provenance : Made available in DSpace on 2012-10-24T22:39:12Z (GMT). No. of bitstreams: 1 ZhangJing1996.pdf: 2912464 bytes, checksum: 6c0ace399f1dd828adcb5840802c0efc (MD5) Previous issue date: 1995-11-27

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