J. Semicond. > 2015, Volume 36 > Issue 10 > 105008
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SEMICONDUCTOR INTEGRATED CIRCUITS

A low power low noise analog front end for portable healthcare system

Yanchao Wang, Keren Ke, Wenhui Qin, Yajie Qin, Ting Yi and Zhiliang Hong

+ Author Affiliations

 Corresponding author: Wang Yanchao, wangyanchao@fudan.edu.cn; Yi Ting, yiting@fudan.edu.cn

DOI: 10.1088/1674-4926/36/10/105008

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Abstract: The presented analog front end (AFE) used to process human bio-signals consists of chopping instrument amplifier (IA), chopping spikes filter and programmable gain and bandwidth amplifier.The capacitorcoupling input of AFE can reject the DC electrode offset.The power consumption of current-feedback based IA is reduced by adopting capacitor divider in the input and feedback network.Besides, IA's input thermal noise is decreased by utilizing complementary CMOS input pairs which can offer higher transconductance.Fabricated in Global Foundry 0.35 μm CMOS technology, the chip consumes 3.96 μA from 3.3 V supply.The measured input noise is 0.85 μVrms (0.5-100 Hz) and the achieved noise efficient factor is 6.48.

Key words: AFE, chopping IA, low power consumption, low noise, NEF



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Fig. 1.  System block diagram of AFE.

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Fig. 2.  System diagram of IA.

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Fig. 3.  Main schematic of IA.

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Fig. 4.  Realization of $C$. (a) Structure of tunable capacitor $C_{\rm t}$. (b) Implementation of $C_0.$

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Fig. 5.  Relationship of $C_0$ and $V_{\rm c}$.

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Fig. 6.  Input impedance model of IA.

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Fig. 7.  Schematic of RRL.

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Fig. 8.  AC response of RRL.

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Fig. 9.  Noise model of AFE.

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Fig. 10.  CSF and the control signals.

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Fig. 11.  The topology of PGA.

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Fig. 12.  CSF and the control signals.

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Fig. 13.  Transient response of AFE.

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Fig. 14.  (Color online) Measured results of AFE's AC response.

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Fig. 15.  Measured input noise density spectrum.

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Table 1.   Performance summary and comparison.

Parameter Reference [10] Reference [13] Reference [14] Reference [15] This work
Technology 0.13 $\mu$m 0.5 $\mu$m 0.18 $\mu$m 0.18 $\mu$m 0.35 $\mu$m
Power supply (V) 1 3.3 1.8 1.8 3.3
Supply current ($\mu $A) 12.1 20 11 12.5 3.96
Input impedance (M$\upOmega )$ 4 @ 1 kHz >100 >2000 2000 300 @ 80 Hz
Input noise ($\mu $Vrms) 2.2 - 0.8 0.8 0.85
(20-10 kHz)(0.5-100 Hz)(0.5-100 Hz)(0.5-100 Hz)
DEO (mV) Rail to rail 50 Rail to rail Rail to rail Rail to rail
CMRR (dB) 80 120 82 82 115
PSRR (dB) $>80$ $>80$ - - 100
NEF 4.9 9.2 12 16 6.48
Gain (dB) 40 52-68 10-40 43-63 41-79
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    Received: 06 March 2015 Revised: Online: Published: 01 October 2015

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      Article Navigation >  Journal of Semiconductors  > 2015  >  36(10): 105008
      Yanchao Wang, Keren Ke, Wenhui Qin, Yajie Qin, Ting Yi, Zhiliang Hong. A low power low noise analog front end for portable healthcare system[J]. Journal of Semiconductors, 2015, 36(10): 105008. doi: 10.1088/1674-4926/36/10/105008 ****Y C Wang, K R Ke, W H Qin, Y J Qin, T Yi, Z L Hong. A low power low noise analog front end for portable healthcare system[J]. J. Semicond., 2015, 36(10): 105008. doi: 10.1088/1674-4926/36/10/105008.
      Citation:
      Yanchao Wang, Keren Ke, Wenhui Qin, Yajie Qin, Ting Yi, Zhiliang Hong. A low power low noise analog front end for portable healthcare system[J]. Journal of Semiconductors, 2015, 36(10): 105008. doi: 10.1088/1674-4926/36/10/105008 ****
      Y C Wang, K R Ke, W H Qin, Y J Qin, T Yi, Z L Hong. A low power low noise analog front end for portable healthcare system[J]. J. Semicond., 2015, 36(10): 105008. doi: 10.1088/1674-4926/36/10/105008.
      shu

      A low power low noise analog front end for portable healthcare system

      DOI: 10.1088/1674-4926/36/10/105008

      • State Key Laboratory of ASIC & Systems, Fudan University, Shanghai 201203, China

      Funds:

      Project supported by the Science and Technology Commission of Shanghai Municipality (No.13511501100), the State Key Laboratory Project of China (No.11MS002), and the State Key Laboratory of ASIC & System, Fudan University.

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