It has been suggested that apparent diffusion coefficient (ADC) contrast can be sensitive to cerebral blood flow (CBF) changes during brain activation. However, current ADC imaging techniques have an inherently low temporal resolution due to the requirement of multiple acquisitions with different b-factors, as well as potential confounds from cross talk between the deoxyhemoglobin-induced backg...

The “Split ADC” architecture enables fully digital calibration and correction of nonlinearity errors due to capacitor mismatch in a Successive Approximation (SAR) ADC. The die area of a single ADC design is split into two independent halves, each converting the same input signal. Total area and power is unchanged, resulting in minimal increase in analog complexity. For each conversion, the half...

This work describes a 10-bit 40MS/s pipelined analog-to-digital converter (ADC) which is used in IEEE 802.11a WLAN system. This pipelined ADC is consisted of one sample-and-hold (S/H) circuit and nine uniform pipelined stages. In this pipelined ADC, the resolution for the S/H circuit and each single pipelined stage is up to 12 bit and 14 bit respectively at 8 MHz input frequency. The spurious f...

-Based on ∆∑ modulator, an on-chip analog ramp generator for ADC BIST (Built-in Self Test) is presented. Technique uses the over-sample and ∆∑ noise shaping to generate the on-chip precise analog ramp with the precise control of a calibrator of ramp slope. Moreover, because of over-sample and ∆∑ noise shaping, the design of analog circuits is simplified, and is tolerant to the mismatch of techn...

A new high-resolution and high-speed fully differential Successive Approximation Register (SAR) Analog to Digital Converter (ADC) based on Capacitor Merged Technique is presented in this paper. The main purposes of the proposed idea are to achieve high-resolution and high-speed SAR ADC simultaneously as well. It is noteworthy that, exerting the suggested method the total capacitance and the rat...

BACKGROUND AND PURPOSE DWI has been increasingly used to characterize orbital masses and provides quantitative information in the form of the ADC, but studies of DWI of orbital masses have shown a range of reported sensitivities, specificities, and optimal threshold ADC values for distinguishing benign from malignant lesions. Our goal was to determine the optimal use of DWI for imaging orbital ...

Abstract A fixed-window level-crossing analog-to-digital converter (LC-ADC) with a single comparator is proposed for the biomedical field. In this paper, signal varying direction detection circuit to judge trend of input signal, instead low-precision in modified LC-ADC. The LC-ADC utilizes only one continuous-time multiple comparators traditional LC-ADC, leading simplified implementation and si...

A Software Defined Radio for Ultra Wideband (UWB) communication systems places several stringent requirements on the Analog to Digital Converter (ADC). The ADC must have a sufficiently fast sampling frequency and SNR to accurately reconstruct the received UWB pulse. Such an ADC can be prohibitively expensive, as well as challenging to interface with a DSP or FPGA. An alternative approach is to ...