Title | A Novel Two-Channel Continuous-Time Time-Interleaved 3rd-order Sigma- Delta Modulator with Integrator-Sharing Topology |
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Type | Journal article |
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Authors | Talebzadeh, J. and Kale, I. |
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Abstract | this paper presents a 3rd-order two-path Continuous-Time Time-Interleaved (CTTI) delta-sigma modulator which is implemented in standard 90nm CMOS technology. The architecture uses a novel method to resolve the delayless feedback path issue arising from the sharing of integrators between paths. By exploiting the concept of the time-interleaving techniques and through the use time domain equations, a conventional single path 3rd-order Discrete-Time (DT) ΔΣ modulator is converted into a corresponding two-path Discrete-Time Time-Interleaved (DTTI) counterpart. The equivalent Continuous-Time Time-Interleaved version derived from the DTTI ΔΣ modulator by determining the DT loop filters and converting them to the equivalent Continuous-Time (CT) loop filters through the use of the Impulse Invariant Transformation. Sharing the integrators between two paths of the reported modulator makes it robust to path mismatch effects compared to the typical Time-Interleaved (TI) modulators which have individual integrators in all paths. The modulator achieves a dynamic range of 12 bits with an OverSampling Ratio (OSR) of 16 over a bandwidth of 10MHz and dissipates only 28mW of power from a 1.8-V supply. The clock frequency of the modulator is 320MHz but integrators, quantizers and DACs operate at 160MHz. |
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Keywords | discrete-time, continuous-time, delta-sigma modulator, signal transfer function, noise transfer function, and timeinterleaved. |
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Journal | Analog Integrated Circuits and Signal Processing |
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Journal citation | 95 (3), pp. 375-385 |
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ISSN | 0925-1030 |
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| 1573-1979 |
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Year | 2018 |
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Publisher | Springer |
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Accepted author manuscript | License CC BY 4.0 File Access Level Open (open metadata and files) |
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Publisher's version | License CC BY 4.0 File Access Level Open (open metadata and files) |
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Digital Object Identifier (DOI) | https://doi.org/10.1007/s10470-018-1125-5 |
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Web address (URL) | https://link.springer.com/article/10.1007%2Fs10470-018-1125-5 |
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Publication dates |
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Published | 14 Feb 2018 |
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Supplemental file | License CC BY 4.0 File Access Level Open (open metadata and files) |
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License | CC BY 4.0 |
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