Analog Integrated Circuits and Signal Processing

, Volume 98, Issue 2, pp 291–297 | Cite as

A wideband current amplifier with DC-offset cancellation utilizing chopper modulation

  • Horng-Yuan ShihEmail author
  • Yu-Chuan Chang
  • Cheng-Wei Yang


A wideband current amplifier with DC-offset cancellation utilizing chopper modulation is proposed. Combining series–series feedback with backgate driven choppers, a wideband current amplifier with DC-offset cancellation is realized. As consumed a power of 1.495 mW under a supply voltage of 1.8 V, measured bandwidth of the current amplifier is 120 MHz, which leads the current amplifier can be adopted to compose the analog baseband of a wideband direct-conversion receiver with bandwidth of 240 MHz (twice of the baseband bandwidth). Measured current gain of the current amplifier is 15 dB. Measured output DC-offset without and with DC-offset cancellation are − 70.8 dBV and − 91 dBV, respectively. Thus, DC-offset reduction of 20 dB is achieved.


Current amplifier DC-offset cancellation Chopper modulation Analog baseband Wideband Receiver 



This study was funded by Ministry of Science and Technology, Taiwan.


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Horng-Yuan Shih
    • 1
    Email author
  • Yu-Chuan Chang
    • 1
  • Cheng-Wei Yang
    • 1
  1. 1.Electrical and Computer EngineeringTamkang UniversityNew Taipei CityTaiwan, ROC

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