An Optimal Design Method for CMOS Even-Stage Ring Oscillators Containing Plural Latches

2009 International Conference on Solid State Devices and Materials (SSDM 2009), October 7-9, 2009, Sendai, Miyagi, Japa

Static Noise Margin Evaluation Method Based on Direct Polynomial-Curve-Fitting with Universal SRAM Cell Inverter TEG Measurement

A new method to evaluate the static noise margin (SNM) for leading-edge CMOS SRAM development is proposed. This method includes: (1) direct measurement of the inverter DC transfer curves using a "universal SRAM cell inverter TEG (USCIT)" with arbitrary transistor ratios, (2) curve-fitting of the measured data to polynomial functions in a 45-degree rotated space, and (3) a database of the polynomial coefficients to evaluate and optimize the SNM by a simple algebraic operation. The SNM values obtained using this method are in good agreement with the measured SRAM operations.2009 IEEE International Conference on Microelectronic Test Structures (ICMTS), 30 March-2 April 2009, Oxnard, CA, US

An Electrically Adjustable 3-Terminal Regulator with Post-Fabrication Level-Trimming Function

This paper describes a new technique for 3-terminal regulators to adjust the output voltage level without additional terminals or extra off-chip components. By applying a serial control pattern using the intermediate voltage level between the supply voltage and the regulator output, the adjustment data in the internal nonvolatile memory are safely updated without noise disturbance. In an on-board test with a chip fabricated using a 0.35-¿m standard CMOS process, we confirm successful output voltage adjustment with sub-10mV precision.15th Asia and South Pacific Design Automation Conference (ASP-DAC 2010), January 18-21, 2010, Taipei, Taiwa

An Optimal Design Method for CMOS Even-Stage Ring Oscillators Containing Latches

This paper describes a design method for complementary metal oxide semiconductor (CMOS) ring oscillators composed of even-stage inverters. First, we propose a quantitative method to evaluate oscillation stability for an even-stage ring oscillator with a CMOS latch. The method uses static noise margin analysis to evaluate the static random access memory (SRAM) cell\u27s data storage stability, by observing the similarity between the oscillator and SRAM cell circuitry. Next, the method is extended to oscillators with multiple latches. Finally, by analyzing oscillation stability using this method, we find that the range of stable oscillation conditions can be drastically widened by adding multiple single-channel latch circuits, and also by an appropriate design of their polarities and insertion positions. We also clarify through Monte Carlo simulations, that the optimized oscillator circuit is robust under process, voltage and temperature fluctuations and device characteristic variations

A Case of Pill-Induced Esophagitis With Mucosal Dissection

With the advance of gastrointestinal endoscopy, pill-induced esophagitis has been detected more frequently, but the association of mucosal dissection is rare. We reported a case of pill-induced esophagitis associated with mucosal dissection

An Optimal Design Method for Even-Stage Ring Oscillators with a CMOS Latch

This paper describes an analysis of oscillation conditions in CMOS ring oscillators composed of even-stage inverters. A design method optimizing the oscillator\u27s operational margin based on this analysis is also described. We have found that stable oscillation margin analysis for this type of circuit is basically equivalent to the Static Noise Margin (SNM) analysis for SRAM write/read operations. Using this concept, we have established a design method that determines the optimal circuit design parameters to ensure stable oscillation.2008 International Conference on Solid State Devices and Materials (SSDM 2008), September 23-26, 2008, Tsukuba, Ibaraki, Japa

Genetic analysis of TP53 in childhood myelodysplastic syndrome and juvenile myelomonocytic leukemia

信州大学博士（医学）・学位論文・平成23年3月31日授与（甲第886号)・齋藤章治ArticleLEUKEMIA RESEARCH. 35(12):1578-1584 (2011)journal articl