19th Ave New York, NY 95822, USA

my-assignmentexpert™ 数字信号处理digital signal process作业代写，免费提交作业要求， 满意后付款，成绩80\%以下全额退款，安全省心无顾虑。专业硕 博写手团队，所有订单可靠准时，保证 100% 原创。my-assignmentexpert™， 最高质量的数字信号处理digital signal process作业代写，服务覆盖北美、欧洲、澳洲等 国家。 在代写价格方面，考虑到同学们的经济条件，在保障代写质量的前提下，我们为客户提供最合理的价格。 由于统计Statistics作业种类很多，同时其中的大部分作业在字数上都没有具体要求，因此数字信号处理digital signal process作业代写的价格不固定。通常在经济学专家查看完作业要求之后会给出报价。作业难度和截止日期对价格也有很大的影响。

my-assignmentexpert™ 为您的留学生涯保驾护航 在信息Information作业代写方面已经树立了自己的口碑, 保证靠谱, 高质且原创的数字信号处理digital signal process代写服务。我们的专家在信息Information代写方面经验极为丰富，各种数字信号处理digital signal process相关的作业也就用不着 说。

## 信号代写|数字信号处理作业代写digital signal process代考|Specifications

In the following, the most important specifications for AD conversion are presented.
Resolution. The resolution for a given word-length $w$ of an AD converter determines the smallest amplitude
$$x_{\min }=Q=x_{\max } 2^{-(w-1)},$$
which is equal to the quantization step $Q$.
Conversion Time. The minimum sampling period $T_{S}=1 / f_{S}$ between two samples is called the conversion time.

Sample-and-hold Circuit. Before quantization, the time-continuous function is sampled with the help of a sample-and-hold circuit, as shown in Fig. 3.24a.

The sampling period $T_{S}$ is divided into the sampling time $t_{S}$ in which the output voltage $U_{2}$ follows the input voltage $U_{1}$, and the hold time $t_{H}$. During the hold time the output voltage $U_{2}$ is constant and is converted into a binary word by quantization.

## 信号代写|数字信号处理作业代写digital signal process代考|Parallel Converter

Parallel Converter. A direct method for AD conversion is called parallel conversion (flash converter). In parallel converters, the output voltage of the sample-and-hold circuit is compared with a reference voltage $U_{R}$ with the help of $2^{w}-1$ comparators (see Fig. 3.29). The sample-and-hold circuit is controlled with sampling rate $f_{S}$ so that, during the hold time $t_{H}$, a constant voltage at the output of the sample-and-hold circuit is available. The outputs of the comparators are fed at sampling clock rate into a $\left(2^{w}-1\right)$-bit register and converted by a coding logic to a $w$-bit data word. This is fed at sampling clock rate to an output register. The sampling rates that can be achieved lie between 1 and $500 \mathrm{MHz}$ for a resolution of up to 10 bits. Owing to the large number of comparators, the technique is not feasible for high precision.

## 信号代写|数字信号处理作业代写digital signal process代考|Successive Approximation

AD converters with successive approximation consist of the functional modules shown in Fig. 3.32. The analog voltage is converted into a $w$-bit word within $w$ cycles. The converter consists of a comparator, a $w$-bit DA converter and logic for controlling the successive approximation.

The conversion process is explained with the help of Fig. 3.33. First, it is checked whether a positive or negative voltage is present at the comparator. If it is positive, the output $+0.5 U_{R}$ is fed to a DA converter to check whether the output voltage of the comparator is greater or less than $+0.5 U_{R}$. Then, the output of $(+0.5 \pm 0.25) U_{R}$ is fed to the DA comparator. The output of the comparator is then evaluated. This procedure is performed $w$ times and leads to a $w$-bit word.

For a resolution of 12 bits, sampling rates of up to $1 \mathrm{MHz}$ can be achieved. Higher resolutions of more than 16 bits are possible at a lower sampling rates.

## 信号代写|数字信号处理作业代写DIGITAL SIGNAL PROCESS代考|SPECIFICATIONS

X分钟=问=X最大限度2−(在−1),