This paper addresses the problem of diagnosis of flash ADC’s and proposes a fault diagnosis technique which employs the Differential NonLinearity (DNL) test data for fault location and identification of the analog components in the converter. In the flash ADC, a fault causes deviation of DNL data from the ideal one. Hence, DNL data can be considered as a functional signature of the ADC. This pr...

We describe a novel MRI technique, detecting metabolism indirectly through changes in oxyhemoglobin: deoxyhemoglobin ratios and T2* signal change during “oxygen challenge” (OC, 5 mins 100% O2). During OC, T2* increase reflects O2 binding to deoxyhemoglobin, formed when metabolizing tissues take up oxygen. Here OC has been applied to identify tissue metabolism within ischemic brain. Permanent MC...

High-speed flash ADCs are useful in high-speed applications such as communication receivers. Due to offset voltage variation the sub-micron processes, power consumption and area increase significantly suppress variation. As an alternative suppressing variation, we have developed a ADC architecture that selects comparators based on ranking for reference generation. Specifically, with order stati...

This paper proposes a 6b 1.2 GS/s 47.8 mW 0.17 mm 65 nm CMOS ADC for high-rate wireless personal area network systems. The proposed ADC employs a source follower-free flash architecture with a wide input range of 1.0 Vp-p at a 1.2 V supply voltage to minimize power consumption and high comparator offset effects in a nanometer CMOS technology. The track-and-hold circuits without source followers...

As integrated circuit technologies progress to nanoscale, process variations become relatively large and significantly impact circuit performance. The proactive management of process variation during the design process is critical to ensure effective device yield and to keep manufacturing costs down. In the present scenario, designers are searching for analog-to-digital converter (ADC) architec...

A novel approach for direct analog-to-residue conversion is presented in this chap/er using the most popular sigma-della analog-to-digital converter. This converter provides high resolulion. high conversion speed and a low cost for implementation. The non-positional nature (~f RNS makes it suitable for fault-toleranl architectures. The error detection and correction properties (?f Redundant Res...

Characteristic features of resonant-tunneling diode (RTD) and a goal of RTD-based IC technology are discussed. Our recent results on RTD-based analog-to-digital converters (ADCs) are then presented. These include designs of a 5-bit 10-GHz flash ADC and a bandpass continuous-time delta-sigma modulator with a center frequency of 500 MHz, which show high potential of RTD-based ultrahigh-speed circ...