Charge pump CMOS circuit based on internal clock voltage boosting for biomedical applications

Raghavendra R. Anantha; Ashok Srivastava; Pratul K. Ajmera

doi:10.1117/12.600546

16 May 2005 Charge pump CMOS circuit based on internal clock voltage boosting for bio-medical applications

Raghavendra R. Anantha, Ashok Srivastava, Pratul K. Ajmera

Proceedings Volume 5763, Smart Structures and Materials 2005: Smart Electronics, MEMS, BioMEMS, and Nanotechnology; (2005) https://doi.org/10.1117/12.600546
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2005, San Diego, California, United States

Abstract

The charge pump CMOS circuit designs are presented for bio-medical applications wherein the clock voltage is boosted internally. Four and six-stage charge pumps are implemented in 1.5 μm n-well CMOS process. The charge pump circuits can be operated in 1.2 V - 3 V power supply voltage range. Outputs of 12.5 V and 17.8 V are measured from four and six-stage charge pumps, respectively with a 3 V power supply. The charge pump circuits can also be used to generate clock voltage higher than the input clock voltage. In the present design, the clock voltages, 8 V and 11 V have been generated from four-stage and six-stage charge pumps, respectively which are nearly 2.5 and 4 times the input clock voltage of 3 V. The technique of boosting the clock internally has been applied in implementation of a bio-implantable battery powered electrical stimulation chip.

Citation Download Citation

Raghavendra R. Anantha, Ashok Srivastava, and Pratul K. Ajmera "Charge pump CMOS circuit based on internal clock voltage boosting for bio-medical applications", Proc. SPIE 5763, Smart Structures and Materials 2005: Smart Electronics, MEMS, BioMEMS, and Nanotechnology, (16 May 2005); https://doi.org/10.1117/12.600546

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