Article
On the Use of FIR Feedback in Bandpass Delta-Sigma Modulators
Author/s | Gorji, Javad
Pavan, Shanthi Rosa Utrera, José Manuel de la |
Department | Universidad de Sevilla. Departamento de Electrónica y Electromagnetismo |
Publication Date | 2024-03 |
Deposit Date | 2024-03-05 |
Published in |
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Abstract | This paper presents a new architecture for bandpass delta-sigma modulators (BP ΔΣ Ms) featuring finite impulse response (FIR) filters in the feedback path. The effectiveness of FIR feedback in lowpass delta-sigma modulators ... This paper presents a new architecture for bandpass delta-sigma modulators (BP ΔΣ Ms) featuring finite impulse response (FIR) filters in the feedback path. The effectiveness of FIR feedback in lowpass delta-sigma modulators (LP ΔΣ Ms) has been well-established in improving loop-filter linearity and robustness to clock jitter. Building upon these findings, we explore the application of bandpass FIR filters in single-bit BP ΔΣ Ms. By contrast to conventional BP ΔΣ Ms, the proposed technique significantly reduces out-of-band quantization error contents in the feedback signal. This approach is applicable to both discrete-time and continuous-time implementations. Further, we show that performance does not improve by increasing the number of FIR taps beyond a certain point. However, we can enhance filtering performance by employing non-equal coefficients within the filter. To validate the efficacy of the presented approach, the paper includes electrical simulation of a 4th-order active-RC BP ΔΣM . |
Funding agencies | Ministerio de Ciencia e Innovación (MICIN). España Agencia Estatal de Investigación. España European Commission (EC). Fondo Europeo de Desarrollo Regional (FEDER) |
Project ID. | PID2019-103876RB-I00
PID2022-138078OB-I00 |
Citation | Gorji, J., Pavan, S. y Rosa Utrera, J.M.d.l. (2024). On the Use of FIR Feedback in Bandpass Delta-Sigma Modulators. IEEE Transactions on Circuits and Systems I: Regular Papers, 71 (3), 1082-1092. https://doi.org/10.1109/TCSI.2023.3336719. |
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