Sharif Digital Repository

A new structure of implantable neural recording microsystem base on multiple valued logic (MVL) has been proposed. MVL is a new idea for reduction of occupied area and the power consumption of microelectronic. In another side, in implantable microsystems , occupied area and power consumption by this type of micro systems is a challenging problem in this field. Therefore, the problem of power consumption and occupied area can introduce as a prime stage of suggested microsystem completed design of convertor of analog to digital in usage of multiple level in this micro system worked. Design of convertor of analog to digital is a convertor of quaternary successive approximation. And also,... 

Low power and high speed analog-to-digital converters (ADCs) are the key elements of communication and computing systems. There are several ADC structures such as delta-sigma, flash, pipeline, and successive approximation register (SAR) for different applications, albeit SAR ADCs are natural candidates of onchip designs for their low power and scalability benefits. Nowadays, SAR ADCs are widely being used in low-power moderate-resolution applications which need several tens of MS/s to low GS/s sampling rates. By virtue of the technology scaling power consumption of digital parts of a SAR ADC is reduced significantly. As a result, in a SAR ADC the power consumption of the digital-to-analog... 

Analog to digital converters is one of the main building blocks of today's circuits. These circuits play an important role in signal processing. Since these circuits consist of analog and digital sections, a large percentage of the power consumed in a circuit is allocated to this section. Therefore, in applications such as medical devices, wearable applications and wireless technology where power control is very important and necessary, reducing the power of analog to digital converters is very important. One of the simplest analog-to-digital converters from the design point of view is Successive Approximation Register (SAR) analog-to-digital converters. This type of analog-to-digital... 

SAR ADC is a data converter which is based on binary search to convert an analog signal to a digital signal. Unlike other converters like pipeline, most of its constituent parts are digital, and hence scalable with process and consume less power, moreover can have better speed and power performance. With advanced technologies, namely 45nm and 32 nm CMOS, SAR ADCs are preferable as they consume much less power and area, therefore well-suited for portable applications, as opposed to Flash and Pipleline converters.
The main drawback of this type of converter is its limited speed which is due to the fact that one clock cycle is required to evaluate each bit. As a result, there is a... 

Successive Approximation Register (SAR) Analog to Digital Converter (ADC) converts an analog signal to a digital code based on binary search. In contrast to other converters, such as Pipeline and Flash ADCs, most of the SAR ADC components are digital, hence, SAR ADC is technology scalable. Therefore, designed using smaller tehcnologies, SAR ADCs are able to operate at a higher frequency with a lower power consumption and area. The main focus of this thesis is to reduce power consumption, although the proposed techniques and circuits are able to improve other features such as precision, area, or speed.Considering Digital to Analog Converter (DAC), a low-power structure and a novel method to...