نتایج جستجو برای: analog to digital conversion adc
تعداد نتایج: 10724141 فیلتر نتایج به سال:
In a digital communication system, the analog signal that the receiver receives with its radio frequency front end is converted into digital format by using the analog-to-digital converter (A/D converter, ADC). Quantisation takes place during the conversion from continuous amplitude signal to discrete amplitude signal, leading inevitably to losses in information which are dependent on the numbe...
Signal processing methods have changed substantially over the last several decades. In modern applications, an increasing number of functions is being pushed forward to sophisticated software algorithms, leaving only delicate finely-tuned tasks for the circuit level. Sampling theory, the gate to the digital world, is the key enabling this revolution, encompassing all aspects related to the conv...
CMOS active pixel sensor technology, which is widely used these days for digital imaging, is based on analog pixels. Transition to digital pixel sensors can boost signal-to-noise ratios and enhance image quality, but can increase pixel area to dimensions that are impractical for the high-volume market of consumer electronic devices. There are two main approaches to digital pixel design. The fir...
In the paper, an instrument for simultaneous measurement of active, reactive and apparent power is presented. Its functionality is based on a PWM intermediary conversion multichannel analog to digital converter (ADC). The instrument is implemented on an Altera’s Flex10k70 Field Programmable Gate Array (FPGA) device for single phase. It fits roughly 60% of logic cells without any resource sharin...
New technique for cancellation of nonlinear cross-talk in polychromatic parametric sampling gate is described and quantified. The method relies on a newly derived look-up table method that achieves equalization and suppresses nonlinear response associated with parametric sampling operation. The new cancellation scheme is implemented in a framework of a specific parametric photonics assisted ana...
Accurate conversion of wideband multi-GHz analog signals into the digital domain has long been a target of analog-to-digital converter (ADC) developers, driven by applications in radar systems, software radio, medical imaging, and communication systems. Aperture jitter has been a major bottleneck on the way towards higher speeds and better accuracy. Photonic ADCs, which perform sampling using u...
280 INTRODUCTION Accurate collection and processing of electromagnetic information is critical to a wide variety of applications. Present day RF and microwave sensor systems must cover many frequency bands, detect and identify a large range of signal powers, and analyze the signal information on an ever-decreasing time scale. Simultaneously achieving these attributes typically requires multiple...
The proposed stimulus design for linearity test is embedded in a differential successive approximation register analog-to-digital converter (SAR ADC), i.e. a design for testability (DFT). The proposed DFT is compatible to the pattern generator (PG) and output response analyzer (ORA) with the cost of 12.4-% area of the SAR ADC. The 10-bit SAR ADC prototype is verified in a 0.18-μm CMOS technolog...
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...
Owing to its high complexity the hardware development of a flash ADC of larger wordlength has always been a challenging issue. Being the fastest ADC available in practice, flash ADCs are the only solution for digitizing fast signals demanded by on-line real time digital processors. As computer designers have launched 64-bit machines into use, for real time processing applications they need word...
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