Single-Stage OTA biased by Voltage-Combiners with Enhanced Performance using Current Starving

R. Povoa, N. Lourenco, R. Martins, A. Canelas, N. Horta, J. Goes

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


This paper presents an improved single-stage amplifier biased by voltage-combiners, through the proper usage of current starving. The topology designed and fabricated shows an enhancement of the low-frequency gain; an improvement in the establishing time due to enhanced gain-bandwidth product; and a high improvement of the energy-efficiency. The circuit was optimized using AIDA-C, a state-of-the-art multi-objective multi-constraint analog IC sizing and optimization tool, and simulation results demonstrate that a gain above 60 dB and a figure-of-merit over 900 MHz×pF/mA are acquirable with this circuit, using the UMC 130 nm technology design kit. The circuit was fabricated and experimentally measured, presenting a gain of 58 dB with a figure-of-merit of 1102 MHz×pF/mA, for a 3.3 V supply source.

Original languageEnglish
Number of pages5
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
Publication statusAccepted/In press - 23 Nov 2017


  • Amplifier
  • Circuits and systems
  • Current Starving
  • Energy efficiency
  • Energy-Efficiency
  • Feeds
  • Gain
  • Gain Enhancement.
  • Optimization
  • OTA
  • Simulation
  • Single-Stage
  • Topology
  • Voltage-Combiners


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