Polyphase Decomposition for Tunable Band-Pass Sigma-Delta A/D Converters

Feng, Da; Maloberti, Franco; Sin, Sai-Weng; Martins, Rui P.

doi:10.1109/jetcas.2015.2502158

Cited by 8 publications

(4 citation statements)

References 28 publications

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“…Similar to quadrature BP-Σ∆Ms, TI BP-Σ∆Ms are also limited by circuit impairments, such as offset, gain and timing mismatch, which causes spur tones to appear at the output spectrum, thus degrading the noise shaping [46]. Based on a similar idea, some authors proposed a polyphase decomposition of the NTF of BP-Σ∆Ms [47] as follows:…”

Section: Notch Frequency Location and Basic Architecturesmentioning

confidence: 99%

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Bandpass Sigma–Delta Modulation: The Path toward RF-to-Digital Conversion in Software-Defined Radio

Rosa

2023

Chips

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This paper reviews the state of the art on bandpass ΣΔ modulators (BP-ΣΔMs) intended to digitize radio frequency (RF) signals. A priori, this is the most direct way to implement software-defined radio (SDR) systems since the analog/digital interface is placed closer to the antenna, thus reducing the analog circuitry and doing most of the signal processing in the digital domain. In spite of their higher programmability and scalability, RF BP-ΣΔM analog-to-digital converters (ADCs) require more energy to operate in the GHz range as compared with their low-pass (LP) counterparts. This makes conventional direct conversion receivers (DCRs) the commonplace approach due to their overall smaller energy consumption. This paper surveys some circuits and systems techniques which can make RF ADCs and SDR-based transceivers more efficient and feasible to be embedded in mobile terminals.

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Section: Notch Frequency Location and Basic Architecturesmentioning

confidence: 99%

“…we obtain the expression of NTF given in Equation (7). It can be shown that the spur tones due to path mismatches fall out of the signal band at f s /P, with P being the number of paths used in the polyphase decomposition [47].…”

Section: Notch Frequency Location and Basic Architecturesmentioning

confidence: 99%

Bandpass Sigma–Delta Modulation: The Path toward RF-to-Digital Conversion in Software-Defined Radio

Rosa

2023

Chips

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“…The above scheme can be implemented by the N-path architecture [4], As illustrated in Fig. 3, the main path can offer the transfer function of NTF = 1 + z −N , while the remaining polynomial term can be formed by the injection of coupling noise derived from the quantisers.…”

Section: Realisation Of Tunable Noise Transfer Functions (Ntfs)mentioning

confidence: 99%

“…Such characteristic leads to the need for evolving the conventional second‐order bandpass SDM into high order cases. In general, the uniform NTF for N ‐path is given by

NT F_{N - channels} = 1 + k_{1} z^{- 1} + k_{2} z^{- 2} + \dots + k_{N - 1} z^{N - 1} + z^{- N}

The above scheme can be implemented by the N ‐path architecture [4], As illustrated in Fig. 3, the main path can offer the transfer function of NTF = 1 +

z^{- N}

, while the remaining polynomial term can be formed by the injection of coupling noise derived from the quantisers.…”

Section: Realisation Of Tunable Noise Transfer Functions (Ntfs)mentioning

confidence: 99%

Reconfigurable mismatch‐free time‐interleaved bandpass sigma–delta modulator for wireless communications

Jiang¹,

Sin²,

Seng-Pan³

et al. 2017

Electron. lett.

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A reconfigurable bandpass time‐interleaved sigma–delta modulator to achieve a wide tuning range is presented. With the calculated control parameters, the interleaving mismatch tones can always be shifted out of the interesting band during the whole tuning range, allowing always a mismatch‐free implementation. The proposed method adopts a look‐up table to obtain the various parameters including path numbers, path sampling frequencies, and tuning coefficients. With higher levels of reconfigurability the design meets the requirements of a multiband receiver for software defined radio systems, and the technique verified by behavioural simulations that also confirm the performance.

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Taxonomy of ΣΔ Architectures

Rosa¹

2018

Sigma‐Delta Converters

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Polyphase Decomposition for Tunable Band-Pass Sigma-Delta A/D Converters

Cited by 8 publications

References 28 publications

Bandpass Sigma–Delta Modulation: The Path toward RF-to-Digital Conversion in Software-Defined Radio

Bandpass Sigma–Delta Modulation: The Path toward RF-to-Digital Conversion in Software-Defined Radio

Reconfigurable mismatch‐free time‐interleaved bandpass sigma–delta modulator for wireless communications

Taxonomy of ΣΔ Architectures

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