The research program aims at improving the performance of appliances based on Analogto-Digital and Digital-to-Analog conversion (ranging from measuring instruments to on-chip ADC and DAC). This will be done by developing methods for the accurate measurement and correction of conversion errors (including, when applicable, errors caused by transducers and signal-conditioning blocks). Another aim ...

System-on-a-chip (SOC) requires integration of analog circuits and digital circuits on a single silicon chip to decrease cost, power dissipation, volume and radiant noise from the data bus on the printed circuit board (PCB). For these mixed-signal intergrated circuits, the standard digital CMOS technology is the best choice in view of cost, power dissipation and implementation convenience. The ...

We demonstrate a new concept for analog-to-digital (A/D) conversion based on photonic time stretch. The analog electrical signal is intensity modulated on a chirp optical waveform generated by dispersing an ultrashort pulse. The modulated chirped waveform is dispersed in an optical fiber, leading to the stretching of its envelope. We have derived analytical expressions for the stretch factor an...

An 80MS/s analog-to-digital converter (ADC) based on single-slope conversion is presented which utilizes a recently developed gated ring oscillator (GRO) time-to-digital converter (TDC) to achieve an ENOB of 6.45 bits. To save power, the time-to-digital conversion is done in two steps, the first of which is based on coarse time quantization as measured by cycles of an oscillator and the second ...

Capacitor mismatch is the main source of nonlinearity for pipelined analog-to-digital (A/D) converters. Here a digital erroraveraging technique is presented to greatly reduce this effect. Compared to the conventional circuit, the new approach requires only one extra digital addition. This allows a very simple and compact implementation. On the other hand, the conversion speed is halved because ...

The physical layer is the lowest layer in the OSI network hierarchy. The services provided by this layer include digital-to-analogue conversion, modulation, demodulation, and analogue-to-digital conversion. From a vantage point higher up in the OSI hierarchy, the physical layer provides a virtual bit pipe for the transmission of information. Imperfections and perturbative noise in the channel, ...

Some common analog-to-digital conversion techniques, and ben-etits derived trom dual slope as used in the new digital instrument. Drcrrar voLTMETERS DTFFER BASTcALLy from the commonly used analog voltmeters in one respect-their display or readout is a numeric display rather than a meter indication. Analog voltmeters seldom have accuracies greater than about 0.25%, and to achieve even these accu...

Most Digital Signal Processors perform computations on integers, or fixed-point numbers, rather than floating-point numbers. In contrast, Digital Signal Processing algorithms are often designed with real numbers in mind and usually implemented in floating-point. Apart from finite wordlength effects that may appear during signal acquisition and intermediate computations, limits on the signal pre...

Flexible digital library systems need to be able to accept, or “import,” documents and metadata in a variety of forms, and associate metadata with the appropriate documents. This paper analyzes the requirements of the import process for general digital libraries. The requirements include (a) format conversion for source documents, (b) the ability to incorporate existing conversion utilities, (c...