Comparator Noise

Noise Analysis

TODO 📅

Noise Simulation

SNR during sampling region and decison region increase

SNR during regeneration region is constant, where noise is critical

\[ \text{SNR} = \frac{V_{o,sig}^2}{V_{o,n}^2} = \frac{V_{i,sig}^2}{V_{i,n}^2} \]

we can get \(V_{i,n}^2 = \frac{V_{i,sig}^2}{\text{SNR}}\), which is constant also

That is \[ V_{i,n}^2 = \frac{V_{i,sig}^2}{V_{o,sig}^2}V_{o,n}^2 = \frac{V_{o,n}^2}{A_v^2} \] where \(V_{i,sig}\) is constant signal is applied to input of comparator

offset

reference

Xu, H. (2018). Mixed-Signal Circuit Design Driven by Analysis: ADCs, Comparators, and PLLs. UCLA. ProQuest ID: Xu_ucla_0031D_17380. Merritt ID: ark:/13030/m5f52m8x. Retrieved from [https://escholarship.org/uc/item/88h8b5t3]

A. Abidi and H. Xu, "Understanding the Regenerative Comparator Circuit," Proceedings of the IEEE 2014 Custom Integrated Circuits Conference, San Jose, CA, 2014, pp. 1-8.

T. Sepke, P. Holloway, C. G. Sodini and H. -S. Lee, "Noise Analysis for Comparator-Based Circuits," in IEEE Transactions on Circuits and Systems I: Regular Papers, vol. 56, no. 3, pp. 541-553, March 2009 [https://dspace.mit.edu/bitstream/handle/1721.1/61660/Speke-2009-Noise%20Analysis%20for%20Comparator-Based%20Circuits.pdf]

Sepke, Todd. "Comparator design and analysis for comparator-based switched-capacitor circuits." (2006). [https://dspace.mit.edu/handle/1721.1/38925]

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Jaeha Kim, Lecture 12. Aperture and Noise Analysis of Clocked Comparators URL:https://ocw.snu.ac.kr/sites/default/files/NOTE/7038.pdf

Rabuske, Taimur & Fernandes, Jorge. (2017), Chapter 5 Noise-Aware Synthesis and Optimization of Voltage Comparators, "Charge-Sharing SAR ADCs for Low-Voltage Low-Power Applications"

Y. Luo, A. Jain, J. Wagner and M. Ortmanns, "Input Referred Comparator Noise in SAR ADCs," in IEEE Transactions on Circuits and Systems II: Express Briefs, vol. 66, no. 5, pp. 718-722, May 2019. [https://sci-hub.se/10.1109/TCSII.2019.2909429]

Art Schaldenbrand, Senior Product Manager, Keeping Things Quiet: A New Methodology for Dynamic Comparator Noise Analysis URL:https://www.cadence.com/content/dam/cadence-www/global/en_US/videos/tools/custom-_ic_analog_rf_design/NoiseAnalyisposting201612Chalk%20Talk.pdf

X. Tang et al., "An Energy-Efficient Comparator With Dynamic Floating Inverter Amplifier," in IEEE Journal of Solid-State Circuits, vol. 55, no. 4, pp. 1011-1022, April 2020