A power-efficient dynamic-time current mode comparator

Hosny, Ahmed; Farag, Fathi A.; Wahba, Ahmed; Mohamed, Ahmed Reda

doi:10.1016/j.aeue.2023.154934

Cited by 3 publications

(2 citation statements)

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“…Also, audio/video systems require ADC to convert audio signals into digital, and they will playback the voice whenever the user needs a high-quality, low-speed DAC. Sensors often require high dynamic ranges and slow ADCs, whose performance is highly dependent on the quality of the comparator voltage [1][2][3]. Often, comparators have unacceptable offset and noise, so they need to be trimmed or calibrated efficiently to meet the requirement of signal-noise ratio [3].…”

Section: Introductionmentioning

confidence: 99%

“…Sensors often require high dynamic ranges and slow ADCs, whose performance is highly dependent on the quality of the comparator voltage [1][2][3]. Often, comparators have unacceptable offset and noise, so they need to be trimmed or calibrated efficiently to meet the requirement of signal-noise ratio [3]. In 1 V supply CMOS technology, to design a 10-bit ADC (irrespective of the type of architecture), the least significant bit (LSB) of 1 mV (1/210) should be implemented [1,2].…”

Section: Introductionmentioning

confidence: 99%

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A 10.5 ppm/°C Modified Sub-1 V Bandgap in 28 nm CMOS Technology with Only Two Operating Points

Nagulapalli,

Yassine,

Tammam

et al. 2024

Electronics

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Reference voltage/current generation is essential to the Analog circuit design. There have been several ways to generate quality reference voltage using bandgap reference (BGR) and there are mainly two types: current mode and voltage mode. The current-mode bandgap reference (CBGR) is widely accepted in industry due to having an output voltage which is below 1 V. However, its drawbacks include a lack of proportional to absolute temperature (PTAT) current availability, a large silicon area, multiple operating points, and a large temperature coefficient (TC). In this paper, various operating points are explained in detail with diagrams. Similar to the conventional voltage mode bandgap reference (VBGR) circuits, modifications of the existing circuits with only two operating points have also been proposed. Moreover, the proposed BGR occupies a much smaller area due to eliminating the complimentary to absolute temperature (CTAT) current-generating resistor. A new self-biased opamp was introduced to operate from a 1.05 V supply, reducing systematic offset and TC of the BGR. The proposed solution has been implemented in 28 nm CMOS TSMC technology, and extraction simulations were performed to prove the robustness of the proposed circuit. The targeted mean BGR output is 500 mV, and across the industrial temperature range (−40 to 125 °C), the simulated TC is approximately 10.5 ppm/°C. The integrated output noise within the observable frequency band is 19.6 µV (rms). A 200-point Monte Carlo simulation displays a histogram with a 2.6 mV accuracy of 1.2% (±3-sigma). The proposed BGR circuit consumes 32.8 µW of power from a 1.05 V supply in a fast process and hot (125 °C) corner. It occupies a silicon area of 81 × 42 µm (including capacitors). This design can aim for use in biomedical and sensor applications.

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