Low-voltage variable gain current amplifier for high-voltage signal processing

Nicodimus Retdian, Jieting Zhang, Takahide Sato, Shigetaka Takagi

Research output: Contribution to journalArticlepeer-review


In low power-supply voltage systems, the method converting the input voltage signals into current signals by a resistor is useful in case that the amplitude of input voltage signals is larger than the supply voltage. This paper proposes a variable gain current amplifier as a current mode processing interface. The proposed circuit uses MOSFETs operated in the triode region to obtain a controllable current gain. High linearity is achieved by fixing the drain-to-source voltage of the MOSFETs. The proposed circuit is simulated by HSpice to confirm its performance.

Original languageEnglish
Pages (from-to)1511-1517+10
JournalIEEJ Transactions on Electronics, Information and Systems
Issue number8
Publication statusPublished - 2009
Externally publishedYes


  • Current amplifier
  • Low power-supply voltage
  • Triode region
  • Voltage-regulated

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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