A design of low mismatch charge pump with feedback compensation current

Gou Bo; Nei Hai; Wei Meng; Wang Fengbo

doi:10.1117/12.2673246

13 April 2023 A design of low mismatch charge pump with feedback compensation current

Gou Bo, Nei Hai, Wei Meng, Wang Fengbo

Author Affiliations +

Proceedings Volume 12605, 2022 2nd Conference on High Performance Computing and Communication Engineering (HPCCE 2022); 126051N (2023) https://doi.org/10.1117/12.2673246
Event: Second Conference on High Performance Computing and Communication Engineering, 2022, Harbin, China

Abstract

Charge pump is an important module in analog phase - locked loop. The mismatch current greatly affects the in-band noise of CPPLL. To reduce the charge pump mismatch current to improve the overall noise performance of the PLL. In order to reduce the influence of channel length modulation effect on current source, a compensation current is added to the current source of traditional charge pump, and the current is determined by feedback loop. The simulation results show that when the output voltage ranges from 0.4V to 2.8V after the addition of the structure, the charge-discharge mismatch ratio decreases from 7.9% to 0.34%. Thus, the noise performance of the PLL is greatly improved.

Citation Download Citation

Gou Bo, Nei Hai, Wei Meng, and Wang Fengbo "A design of low mismatch charge pump with feedback compensation current", Proc. SPIE 12605, 2022 2nd Conference on High Performance Computing and Communication Engineering (HPCCE 2022), 126051N (13 April 2023); https://doi.org/10.1117/12.2673246

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