This paper studies all the subblock circuits of pipeline adc first, and then come up with all the constraints and. Abstract this paper presents the systematic design approach of a lowpower, mediumresolution, highspeed pipelined analogtodigital converter adc. A 210 mss dualchannel 12bit analogtodigital converter adc employing a pipelined successive approximation sar architecture is presented. The model resolution is very flexible, and system level techniques are easily added. Pipelined structure, as one of the typical architectures has been widely implemented in the adc design. Page 1 ee247 lecture 22 adc converters pipelined adcs eecs 247 lecture 22. Sources of errors robust performance of pipelined adcs. Below is a simulink model for a pipelined adc including nonidealities such as offsets, matching, and noise.
Yoshioka et al 10bit, 125 mss, 40 mw pipelined adc in 0. Improving accuracy and energy efficiency of pipeline. A 12bit 50m sampless digitally selfcalibrated pipelined adc. The orst is employed as a pseudodifferential form in mdacs and the input sampling circuit. Itc2ncs where itc is the information transfer capacity in symbolssec, n is the number of bits and cs is the conversion speed, for example, an 8bit, 1gsps adc has an itc of 2.
One of the most famous architectures of padc is the 1 bit per stage padc. How to merge pdfs and combine pdf files adobe acrobat dc. However, they also bring some drawbacks affecting the adc performance, such as nonlinearity and distortion. Overview of the frontend read out in the high speed configuration the chip included a 12 bits adc and a 3 to 1 analog multiplexer. Digital background calibration of interstagegain capacitor. It requires 8500 mi12, consumes 180 mw, and has an input capacitance of 3 pf. The pipelined analogtodigital converter adc has become the most popular adc. Adc architectures university of california, berkeley. A digitally calibrated 12 bits 25 mss pipelined adc with a 3. Secondly, the capacitor is connected to the input and output nodes of the amplifier only during the hold phase. Slides by bibhudatta sahoo22 thermal noise consideration 2 22 it is costly in terms of power, area, and speed to make input thermal noise smaller than quantization noise for adc resolution, bits. Therefore, the feedback gain from the output node to the input node of the amplifier is 1.
Designerdriven topology optimization for pipelined analog to. Designerdriven topology optimization for pipelined analog. Testing of nstage 1 bit per stage pipelined adc using. A multistage pipelined subranging adc with one bit per. Lewis et al, a pipelined 5msamples 9bit analogtodigital converter, ieee journal of solidstate circuits, vol sc22, december 1987, pp. The pic32 12bit pipelined adc module has the following special function. Hugh barnaby, chair bertan bakkaloglu jennifer blain christen arizona state university august 2012. Different stages process different samplers concurrently. Dem in pipelined adcs electrical and computer mcgill university. The pipelined adc consists of a frontend sample and hold amplifier sh amplifier and m pipelined stages and the number of bits to be converted in each stage mi.
Therefore for highresolution and highspeed this circuit non idealities should calibrated in digital domain. Chapter 2 describes the general pipelined architecture and specifies in the 1bitstage pipelined adc. A pipelined 5msamples 9bit analogtodigital converter. How to tradeoff and get rid of these bad factors are the hot points in the lowpower pipelined adc design area. The pipelined adc including nonidealities was modeled in matlab simulink simulation environment. Click, drag, and drop to reorder files or press delete to remove any content you dont want. A basic understanding of these, the three most popular adc architecturesand their relationship to the market.
Pipelined adc free download as powerpoint presentation. You can merge pdfs or a mix of pdf documents and other files. The adc is partitioned into 3 stages with passive residue transferring between the 1st and the 2nd stages and active residue amplification between the 2 nd and the 3rd stages. Various architectures exist for performing ad conversion using one stage per bit, and the overall concept is shown in figure 1. Lowpower and highspeed pipelined adc using timealigned. In 1 and 5 a split adc stretcher with background calibration are. A 12b, 75mss pipelined adc using openloop residue amplification, isscc dig. In electronics, an analogtodigital converter adc, ad, or atod is a system that converts an analog signal, such as a sound picked up by a microphone or light entering a digital camera, into a digital signal. Ee247 lecture 23 university of california, berkeley. Pdf the paper describes design requirements of a basic stage called mdac multiplying digitaltoanalog converter of a pipelined adc.
Introduction a pipelined adc architecture offers good tradeoff between conversion rate, resolution and power con. One extra bit from each stage is used to implement digital correction logic. In this paper, a 10bit 50mss nyquistrate cmos pipelined analogtodigital converter adc with digital correction is presented for the wlan application. An adc may also provide an isolated measurement such as an electronic device that converts an input analog voltage or current to a digital number representing the magnitude of the. Lecture 23 pipelined adcs continued effect gain stage, subdac nonidealities on overall adc performance. A block diagram of the subranging architecture is shown in. Thus, like the singlecycle datapath, a pipelined processor needs. A pipelined adc with digital correction for ieee 802. The analog output signal of ith stage in the pipelined adc based on input signal can be expressed as. Keywords pipelined adc, mdac, sc technique, matlab model, thermal noise, opamp. A pipelined adc macro design for multiple applications abstract we present a new design methodology for highspeed analogtodigital converter adc macros based on our original pipelined 10bit adc.
Pipelined adc analog to digital converter digital to. This paper presents a 10bit, 125 mss cmos pipelined analogtodigital converter adc. Boser 15 dsp measuring gv ref if we knew the value of gv ref, we could use use that in our digital logic, rather. Boser, a 12b, 75mss pipelined adc using openloop residue amplification, isscc dig. Lowvoltage pipelined adc using opampreset switching. Nonetheless, pipelined adcs of various forms have improved greatly in speed, resolution, dynamic performance, and low power in recent years. It consists of several cascaded stages each resolve n bit, timing circuits and digital correction block. Pdf basic block of pipelined adc design requirements. This design makes the assumption that a high speed converter helps to minimize the total cross talk and the equivalent power dissipation related to each channel. Hence, this paper focuses on the basic principle of the twostage pipelined sar adc and optimizes the stage resolution for a better performance in linearity, power, noise and speed. Accuracy needed for fine adc relaxed by introducing interstage gain example.
A generic multilevel multiplying da converter for pipelined adcs vivek sharma, unku moon, gabor c. The power consumption of this adc is just 40 mw at a supply voltage. Correction of nonideal amplifiers effect in pipelined adcs. Pipelined datapath the goal of pipelining is to allow multiple instructions execute at the same time we may need to perform several operations in a cycle increment the pc and add registers at the same time. A digitally calibrated 12 bits 25 mss pipelined adc with. Rearrange individual pages or entire files in the desired order. A pipelined 5msamples 9bit analogtodigital converter stephen h. With library reuse methodology and performance driven optimization techniques, we have been. Finally, based on these basic principles and optimizations, a 10bit twostage pipelined sar adc was fabricated and measured. The adc is composed of 9 cascaded stages with a frontend input sampling circuit.
The pipelined adc is a popular nyquistrate data converter due to its attractive feature of maintaining. Maxim design support technical documents tutorials. Sri satya sai institute of science and technology, sehore, bhopal. The sources of errors in a 1bitstage pipelined adc is also addressed in the chapter. The folding architecture is one of a number of possible serial or bitperstage architectures. Analog to digital converter, operational trans conductance amplifier, design of all the blocks used in pipeline introduction this project report presents the design of 12bit pipeline adc operating at sampling rate of 100mhz. Several calibration methods have been proposed for background calibration in pipelined adcs with nonlinear effects of amplifier 1, 3, 4. The third technique facilitates large adc power reduction by replacing all opamps in a 10bit 50 mss pipelined adc with source followers, and uses a novel fullydifferential passive gain technique to obtain an mdac gain near 2x. Kwok et al, power optimization for pipeline analogtodigital converters, ieee transactions on circuits and systemsii.
Adcs are the most popular in mobile communication systems. The pipelined adc is a practical and efficient structure for moderate speed1200mss, moderate resolution 1016 bits adcs. Reference 9 takes use of dummy sampling capacitances. The pipeline adc is a popular architecture for implementing adcs with a wide. Pipelined adc with four 3bit stages each stage resolves two bits. Index termsanalogtodigital converter adc, correlated double sampling cds, data converter, high speed, low power, low voltage, pipeline. In electronics, an analogtodigital converter adc, ad, or atod is a system that converts an analog signal, such as a sound picked up by a microphone or light entering a digital camera, into a. Pipelined adc architecture figure 1 shows a block diagram of a 12bit pipelined adc. By ankur modi, prof jaikaran singh, prof mukesh tiwari, dr.
Lowvoltage adc design a block diagram of a 10bit 1. A figureofmerit to evaluate the performance of an adc is its information transfer capacity. Corresponding registers appear after the summaries, which include a detailed description of each bit. A low power, middleresolution 710 bit, middle speed 20mhz200mhz pipelined adc is an important block in modern applications of telecommunication, consumer electronics, and medical electronics. Analysis and optimization of the twostage pipelined sar adcs. Introduction the switchedcapacitor pipelined analogtodigital converter adc is considered suitable for lowpower and highspeed applications 1. Understanding pipelined adcs tutorial maxim integrated. If fullscale adc input is 1 v, then for a 11bit adc the quantization noise power is given by.
Fetch one instruction while another one reads or writes data. The feedback capacitor mismatch error, u onl slg ig capacitor is randomly swapped with the sampling capacitors in the neededto implementits calibration logic. The pipelined adc had its origins in the subranging architecture which was first used in the 1950s as a means to reduce the component count and power in tunnel diode and vacuum tube flash adcs see references 1, 2. Power optimization in 3 bit pipelined adc structure.
Testing of nstage 1 bit per stage pipelined adc using test. This research is dedicated to develop a pipeline adc design methodology with minimum power dissipation, while keeping relatively. Designers have used a variety of configurations m1 m2 m3 to design pipelined adcs, starting from the. Modeling and implementation of a 6bit, 50mhz pipelined adc in.
Pipelined sar adc with background calibration in 28nm digital cmos, vlsi circuits symp. The concurrent operation of all pipelined stages makes this. A pipelined adc architecture offers good tradeoff between conversion rate, resolution and power consumption. A novel digital background calibration technique for 16 bit sha. Pipelined adc architectures general pipelined system each stage performs an operation on the signal, provides the output for the following sampler, and, once the sampler has acquired the data, begins the same operation on the next signal. A pipelined adc macro design for multiple applications. This family reference manual section is meant to serve as a complement to device. Pipeline adc area, power, speed, resolution tradeoff 28 for a given adc resolution, the number of stages and number of bits resolved in each stage determines.
1512 1202 558 1024 1291 1158 936 2 951 1025 1387 208 109 1497 966 321 1544 894 925 906 690 1041 640 754 912 1393 976 917 898 399 1328 651 1297 114 834 275 896 668 1163 885 564 748 922