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A reused chopper/AM mixing amplifier for bio-signals acquisition

Authors
  • Liu, Lianxi1, 2
  • Zhang, Yi1
  • Mu, Junchao1
  • Hua, Tianyuan1
  • 1 Xidian University, School of Microelectronics, 2 South Taibai Road, Xi’an, Shaanxi, 710071, People’s Republic of China , Xi’an (China)
  • 2 Xidian University, Shaanxi Key Lab of Integrated Circuits and Systems, School of Microelectronics, Xi’an, 710071, People’s Republic of China , Xi’an (China)
Type
Published Article
Journal
Analog Integrated Circuits and Signal Processing
Publisher
Springer US
Publication Date
Mar 26, 2019
Volume
99
Issue
2
Pages
471–481
Identifiers
DOI: 10.1007/s10470-019-01445-7
Source
Springer Nature
Keywords
License
Yellow

Abstract

Bio-signal audio-transmission schemes require the design of a dedicated audio-modulation circuit to modulate the signal to audio band. In the conventional system, amplification and audio-modulation of the bio-signals are separated. A chopper/AM mixing amplifier is proposed in this paper according to the characteristics of the audio-transmission. The proposed amplifier could implement chopper-modulation and audio-modulation functions simultaneously as input signal passes through only one multiplier. This scheme reduces the three modulations into one modulation, and combines the two low-pass filtering into a band-pass filtering, which substantially simplifies the system structure and effectively reduces the power consumption.

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