Effects of non-ideal Hadamard modulators on the performance of ΠΔΣ ADC

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Effects of non-ideal Hadamard modulators on the performance of ΠΔΣ ADC

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A non-ideal Hadamard modulator in the front-end of ΠΔΣ ADC can be modelled as an ideal Hadamard modulator with gain error in parallel with an offset error. The effects of non-ideal Hadamard modulators can be partially removed by using chopper stabilisation and adaptive channel gain equalisation.

Inspec keywords: Hadamard transforms; circuit stability; adaptive equalisers; choppers (circuits); sigma-delta modulation

Other keywords: gain error; chopper stabilisation; adaptive channel gain equalisation; offset error; ΠΔΣ ADC; nonideal Hadamard modulators

Subjects: A/D and D/A convertors; A/D and D/A convertors

References

    1. 1)
      • I. Galton , H.T. Jensen . Delta-sigma modulator based A/D conversion without oversampling. IEEE Trans. Circuits Systems II: Analog Digital Signal Process. , 12 , 773 - 784
    2. 2)
      • Kong, S.K., Ku, W.H.: `Adaptive equalization of channel gain mismatches in ΠΔΣADC', TA1.6, IEEE 39th Midwest Symp. Circuits and Systems, Ames, Iowa, USA, p. 18–21.
    3. 3)
      • Kong, S.K., Ku, W.H.: `Frequency domain analysis of ΠΔΣ ADC and its applicationto combining subband decomposition and ΠΔΣ ADC', TA1.6, IEEE 39th Midwest Symp. Circuits and Systems, 18–21 Aug 1996, Ames, Iowa.
    4. 4)
      • S.K. Kong , W.H. Ku . A chopper stabilized ΠΔΣ analog to digital conversion. Electron. Lett. , 12 , 1052 - 1054
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