基于65nm CMOS的10位低功耗逐次逼近ADC
[Abstract]:With the development of modern science and technology, implantable biomedical devices have become one of the hot research directions. Compared with the traditional portable medical equipment, it is more flexible and has a very important significance for the diagnosis and treatment of diseases. However, how to make implantable medical devices safer and more stable for the benefit of patients still faces enormous challenges, especially for implanted chips, not only in terms of their shape and size, but also because of their anatomical location. The power dissipation of the chip can also damage the anatomical tissue. Successive approximation (SAR:Successive-Approximation-Register) A / D converter (ADC: Analog-to-Digital Converter) is widely used in biomedical electronics due to its simple structure, small area and low power consumption. This paper focuses on the optimization of power consumption and area of SAR ADC, circuit design, layout design and simulation verification for implanted biochip applications. In this paper, a low power 10-bit SAR ADC, is designed, which consists of a sampling / holding circuit, a D / A conversion network, a comparator and a SAR logic control circuit. By studying the different circuit structure of each module and discussing the non-ideal factors that affect the circuit performance, the traditional charge redistribution SAR ADC circuit is improved and optimized. The design results meet the low power requirement of implanted biochip. The main design projects are as follows: 1. Because capacitance array does not consume static power, charge redistribution structure is the main structure of low power SAR ADC. A novel D / A conversion network based on piecewise capacitor array and its switching timing are proposed. The structure of redundant capacitors in piecewise capacitor array is mainly improved, compared with the existing D / A conversion network. Effectively reduced power consumption and area. 2. The SAR ADC designed in this paper adopts differential input structure based on the sampling of upper pole plate. On the one hand, the differential input structure can suppress common-mode interference and improve the performance of ADC. On the other hand, the sampling of upper pole plate can effectively reduce the size of input capacitor array. Conducive to power consumption and area optimization. 3. In other module circuits, the sampling / holding part uses bootstrap switch to sample the input analog signal, and its relatively constant on-resistance ensures the linearity of the sampling circuit. The SAR ADC comparator designed in this paper adopts a two-stage cascade dynamic structure, which effectively reduces the static power consumption of the whole ADC. The logic control part of SAR uses a circuit composed of dynamic cells, which greatly reduces the complexity of the logic circuit and reduces the power consumption and area of the digital circuit. The whole 10-bit SAR ADC is realized by 65nm CMOS process design, and is designed and verified by Cadence and Matlab tools. When the supply voltage and reference voltage are 0.8V, the sampling rate is 50KS / s and the input is 1.5KHz differential sinusoidal signal, the signal to noise distortion ratio (SNDR:Signal-to-Noise-and-Distortion Ratio) of the whole SAR ADC is 61.42 dB. The number of significant bits (ENOB:Effective Number of Bits) is 9.91, power consumption is 423nW, FoM:Figure of Merit) is 8.7 fJ / Conv. Step. The SAR ADC area designed in this paper is 136 渭 m 脳 176 渭 m, which is very suitable for biochip implantation.
【學位授予單位】:西安郵電大學
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:TN792
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