@article{CTT100666412,
  author = {Takahide Sato and Shigetaka Takagi},
  title = {Analysis of a charge pump for white LED driver using multi-step charging technique},
  journal = {Analog Integrated Circuits and Signal Processing},
  year = 2014,
}

@article{CTT100666415,
  author = {Hiroki Sato and Takahide Sato and Shigetaka Takagi},
  title = {Reduction in Active Elements for Leapfrog Low-pass and Band-pass Filter with Transmission Zeros},
  journal = {電気学会論文誌C},
  year = 2014,
}