نتایج جستجو برای: digital to analog conversion
تعداد نتایج: 10722884 فیلتر نتایج به سال:
This thesis demonstrates that analog-to-digital (A/D) conversion at the intermediatefrequency stage of a radio is feasible for a wide range of cellular and cordless telephony standards. Placing the A/D converter as close as possible to the front end of the radio has manufacturing advantages and allows the use of sophisticated DSP algorithms which are especially usem with digitally coded transmi...
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The new capabilities of smart sensing systems namely, adaptability, reconfiguration, lowenergy consumption and cost, between others, require a wisely selection of the methods that are use to perform analog to digital conversion. It is very important to optimize the trade-offs between, resolution, accuracy, conversion rate, and energy consumption, between others, and above all to adapt dynamical...
Photonic Analog-to-Digital Conversion (ADC) has a long history. The premise is that the superior noise performance of femtosecond lasers working at optical frequencies enables us to overcome the bottleneck set by jitter and bandwidth of electronic systems and components. We discuss and demonstrate strategies and devices that enable the implementation of photonic ADC systems with emerging electr...
Two techniques for performing pixel level analog to digital conversion (ADC) are reviewed. The first is an oversampling technique which uses a one bit first order Ez modulator for each 2 x 2 block of pixels to directly convert photocharge to bits. Each modulator is implemented using 17 transistors. The second technique is a Nyquist rate multi—channel--bit—serial (MCBS) ADC. The technique uses s...
An analog queue-based architecture and an adaptive digital-calibration algorithm calibrate an 8-bit two-stage pipelined algorithmic analog-to-digital converter (ADC). To minimize power dissipation and noise, the queue consists of only one sample-and-hold amplifier. At a sampling rate of 20 Msamples/s, the peak signal-to-noise-and-distortion ratio (SNDR) is 45 dB, and the spurious-free dynamic r...
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 ...
Introduction This project’s purpose is to become familiar with analog to digital conversion on a PIC micro-controller. Four programs demonstrate: assembly timing, A/D conversions, A/D conversion rates, and RC circuit time constants. The micro-controller is a 28 pin DIP PIC16F876 manufactured by Microchip. The PIC voltage input is +5 volts DC via a μA7805 dc/dc voltage regulator. The compiler is...
This paper presents an architecture of signaldependent analog-to-digital converter (ADC) based on MINIMAX sampling scheme that allows achieving high data compression rate and power reduction. The proposed architecture consists of a conventional synchronous ADC, a timer and a peak detector, and AD conversion is carried out only when input signal peaks are detected. To improve the accuracy of sig...
In energy constrained signal processing and communication systems, a focus on the analog or digital circuits in isolation cannot achieve the minimum power consumption. Furthermore, in advanced technologies with significant variation, yield is traditionally achieved only through conservative design and a sacrifice of energy efficiency. In this thesis, these limitations are addressed with both a ...
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