Design of Stage-Selective Negative Voltage Generator to Improve On-Chip Power Conversion Efficiency for Neuron Stimulation

Shiau Pin Lin, Ming Dou Ker*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Dedicated to neuron stimulation circuits, a stage-selective negative voltage generator is proposed to enhance the overall power efficiency. Since the supplied voltage of the stimulus driver is subject to applications and treatments, an extensive output requirement of supply is demanded to achieve energy-efficient stimulation. The charge pump is implemented as a negative voltage generator for on-chip design. In a limited area, excess power loss is eliminated by reconfiguring the cascaded architecture and clocks. Digitally programmable voltage levels can be outputted by varying the number of stages dynamically. The function of stage selection is achieved by the proposed stage-selective scheme. With appreciate control, the stage-selective negative voltage generator can maintain higher power efficiency under different output voltage levels and loading conditions. The technique improves 40% power conversion ratio at most but only leads to an increment of 8% in area occupation. The measured output voltage covers from-0.3 V to-9.3 V within a maximum 5.5-mA output current, which is verified in a 0.25μm BCD process.

Original languageEnglish
Article number9158498
Pages (from-to)4122-4131
Number of pages10
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Volume67
Issue number11
DOIs
StatePublished - Nov 2020

Keywords

  • energy-efficient
  • negative charge pump
  • negative voltage generator
  • stage control
  • Stage-selective circuit

Fingerprint Dive into the research topics of 'Design of Stage-Selective Negative Voltage Generator to Improve On-Chip Power Conversion Efficiency for Neuron Stimulation'. Together they form a unique fingerprint.

Cite this