The thesis is composed of two topics : a fully bidirectional mixed-voltage-tolerant I/O buffer using a clamping dynamic gate bias generator and a wide range fully bidirectional mixed-voltage-tolerant I/O buffer with a calibration function.
The first topic, a mixed-voltage-tolerant I/O buffer implemented in 2P4M 0.35 £gm CMOS process, comprises a low-power bias circuit with clamping transistors in a feedback loop, a power supply level detector circuit, a voltage level converter circuit, a logic switch circuit, a dynamic driving detector circuit, and a clamping dynamic gate bias generator. The proposed design can transmit and receive digital signals with voltage levels of 5/3.3/1.8 V without any gate-oxide overstress and leakage current path in different voltage interface applications.
The second topic, a 0.9 V to 5.0 V (0.9/1.2/1.8/2.5/3.3/5 V) mixed-voltage-tolerant I/O buffer carried out in 2P4M 0.35 £gm CMOS technology, contains a dynamic gate bias generator to provide appropri¬ate gate voltages for the output stage composed of stacked PMOS and stacked NMOS, an I/O buffer which can transmit the signal with a higher voltage level (VDDH), a floating N-well circuit to remove the body effect at the output PMOS, and a dynamic driving detector to balance the turn-on voltages for the pull-up PMOS and pull-down NMOS in the output stage. The duty cycle of the output signal of the proposed I/O buffer can then be equalized even if the output stage power supply is biased at a low voltage. In order to adapt to wide range input voltage applications, a logic calibration circuit is added in the input buffer.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0625108-220304 |
| Date | 25 June 2008 |
| Creators | Chang, Wei-chih |
| Contributors | Chia-Hsiung Kao, Tzyy-Sheng Horng, Sying-Jyan Wang, Chua-Chin Wang |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0625108-220304 |
| Rights | not_available, Copyright information available at source archive |
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