Self-synchronous Circuit

Integrated circuits usually use clock, and each circuit block is synchronized by clock. Self-synchronous circuits do not use global clock, and that each block or cell is operated asynchronously, so that power consumption become lower. Our laboratory develop self-synchronous circuit using differential cascode voltage switch logic(DCVSL) and Moebius circuit which we invented first, and apply self-synchronous circuit to various applications such as FPGA.
More about Non-pipeline CPU using DCVSL
More about Self-synchronous Moebius Circuits
More about Self-synchronous FPGA

Image Sensor

In these days, digital still camera become familiar to us, and, many photo-detectors called image sensor is inside digital still camera. Today’s image sensors are made by CMOS process, so it is easy to design various functions in image sensors. We research not only 2-D image sensors but also 3-D image sensor, and develop 3-D image sensor employing light-section method, time-of-flight and stereo-matching.
More about Multi Functional 3-D Image Sensors
More about Robust 3-D Image Sensor with Correlative Feeble Lighting
More about High Resolution 3-D Image Sensors
More about Ultra High Speed 3-D Image Sensors
More about Spectroscopic CMOS sensors
More about MOS Magnetic Sensors

Signal Integrity

As transistor become smaller, noise on circuits is serious problem. How to reduce noise and operate our circuit correctly is important issue for us. Our laboratory research noise reduction of substrate noise and power supply noise which are major noise on circuit. We also research three wire data encoding or on-chip thermometer to know temperature map on chip.
More about Three Wire Data Encoding
More about Digital Active Substrate Noise Canceller
More about Active Method for Resonant Power Supply Noise Reduction

Analog Technique

As transistor become smaller, power supply voltage become smaller, so that, to design analog circuits using such a process is becoming more and more difficult. We are studying and making researches on analog circuits using advanced CMOS process effectively, for example, time difference amplifiers, time-to-digital converters, and process variability monitors. Furthermore, we also design some circuits considering the performance variation due to the process variation or the aging effects of advanced CMOS processes.
More about Time Difference Amplifiers
More about Time-to-Digital Converters
More about Clock-Data Recovery Circuit


RF circuits are used in various products, and it will be important to design RF circuits easily. Then, we research how to design RF circuits simply by alternating analog component to digital circuits.
More about RF


As the VLSI technologies scale down to nano-mete regime, the circuit design and verification processes have become more and more complex and computer-aided design tools are essential to design VLSI. Our research topics focus on the cell-based LSI design methodologies and include optimal generation of design-specific cell library, SAT(Boolean Satisfiability)-based cell layout synthesis method, and standard cell yield optimization method.
More about design-specific cell library synthesis
More about SAT-based cell layout synthesis
More about standard cell yield optimization