Abstract:SummaryLow‐voltage high‐precision comparators are the main building blocks of many low‐power mixed‐mode electronic devices. In this paper, a rail‐to‐rail high‐precision comparator is introduced. The proposed comparator uses 2 parallel input P‐type metal‐oxide‐semiconductor pairs with a dynamic level shifter to ensure rail‐to‐rail operation. Moreover, the proposed circuit incorporates a rail‐to‐rail offset cancellation circuit. The offset cancellation circuit works based on a time domain bulk‐tuned negative fee… Show more
“…36,37 Therefore, it is very important to design an extremely low offset comparator for the SoC sensor array. In order to reduce input referred voltage (noise) in comparator circuits, it often to design digitally time-sequence switch and very complex techniques to overcome the kickback noise and input offset voltage [38][39][40][41][42] in comparator, and assisted with calibration scheme. [43][44][45] The input referred offset variation due to the capacitive path from ion sensing to the input stage circuit in SoC can degrade the overall performance of the system, for example, the input referred offset voltage shifts the background reference voltage levels in ADC, and result in the erroneous conversion process.…”
Section: Ph Sensing Principle and The Proposed Dual Offset Cancelation In Double Tail Comparatormentioning
The highlight of in vivo or ex vivo measurement to monitor the pH value from blood or saliva is emerging in these years since changes in pH suggest that hidden diseases are about to occur. In this paper, we design and implement a SoC for pH measurement, and a dual offset cancelation technique in comparator featured with 150-uV input referred voltage and 1-GHz comparison bandwidth is verified. The SoC by utilizing proposed dual offset cancelation technique can sense 8 femto farad capacitance change in the deionized water, 12 femto farad change in the glucose liquid, and 14 femto farad in the 0.5% hydrochloric acid.The SoC for pH measurement is not only used to detect pH change in blood or saliva, but can also extend to wearable device to monitor human's biomarkers such as pH and Na+ in sweat to prevent the disease in advance.
“…36,37 Therefore, it is very important to design an extremely low offset comparator for the SoC sensor array. In order to reduce input referred voltage (noise) in comparator circuits, it often to design digitally time-sequence switch and very complex techniques to overcome the kickback noise and input offset voltage [38][39][40][41][42] in comparator, and assisted with calibration scheme. [43][44][45] The input referred offset variation due to the capacitive path from ion sensing to the input stage circuit in SoC can degrade the overall performance of the system, for example, the input referred offset voltage shifts the background reference voltage levels in ADC, and result in the erroneous conversion process.…”
Section: Ph Sensing Principle and The Proposed Dual Offset Cancelation In Double Tail Comparatormentioning
The highlight of in vivo or ex vivo measurement to monitor the pH value from blood or saliva is emerging in these years since changes in pH suggest that hidden diseases are about to occur. In this paper, we design and implement a SoC for pH measurement, and a dual offset cancelation technique in comparator featured with 150-uV input referred voltage and 1-GHz comparison bandwidth is verified. The SoC by utilizing proposed dual offset cancelation technique can sense 8 femto farad capacitance change in the deionized water, 12 femto farad change in the glucose liquid, and 14 femto farad in the 0.5% hydrochloric acid.The SoC for pH measurement is not only used to detect pH change in blood or saliva, but can also extend to wearable device to monitor human's biomarkers such as pH and Na+ in sweat to prevent the disease in advance.
“…An energy‐efficient pipelined ADC is deeply reliant on the energy‐efficient comparator 28 . So in this structure, we have designed a latch with maximum power efficiency and minimum delay of output voltage.…”
Section: Proposed Overall Structurementioning
confidence: 99%
“…An energy-efficient pipelined ADC is deeply reliant on the energy-efficient comparator. 28 So in this structure, we have designed a latch with maximum power efficiency and minimum delay of output voltage. Figure 15 demonstrates the schematic diagram of the proposed dynamic double-tail comparator which is used in the subcontrol block.…”
Section: Proposed Double-tail Dynamic Latch For Subcontrol and Sub-adcmentioning
Summary
In this paper, a low‐power 10‐bit 15‐MS/s opamp‐less pipelined analog‐to‐digital converter (ADC) has been proposed. The circuit is comprised of eight 1.5‐bit/stage MDACs and a 2‐bit backend flash ADC. Each 1.5‐bit/stage structure comprises a CCP‐based MDAC which uses a modified multilevel variable‐current‐source (ML‐VCS) scheme. The modified ML‐VCS CCP structure facilitates its usage in a pipeline ADC structure. Also, the proposed ML‐VCS structure improves the speed behavior as well as the power consumption of a 1.5‐bit/stage CCP‐based MDAC structure. In order to further reduce power consumption, an ultra‐low‐power low‐delay double‐tail dynamic latch has been offered which features high‐speed operation. The suggested ADC is simulated using 180‐nm scaled CMOS technology with a 2‐Vp‐p differential full‐scale input voltage. Hspice simulation results show that the ADC exhibits an SNDR of 60‐dB, an ENOB of 9.67 bits, and the FOM of 0.546 PJ/Conv.step at a Nyquist‐rate input frequency. According to the results, the proposed 10‐bit ADC consumes only 6.7‐mW under a 1.8‐V supply voltage.
“…It can be shown that in the comparison cycle, the current flowing through the input devices are dependent on the input voltages [20]. However, the maximum current is limited by the tail current.…”
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