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4th Order LC-Based Sigma Delta Modulators
Due to the characteristic of narrow band conversion around a central radio frequency, the Sigma Delta Modulator ([Formula: see text] M) based on LC resonators is a suitable option for use in Software-Defined Radio (SDR). However, some aspects of the topologies described in the state-of-the-art, such...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9697217/ https://www.ncbi.nlm.nih.gov/pubmed/36433513 http://dx.doi.org/10.3390/s22228915 |
Sumario: | Due to the characteristic of narrow band conversion around a central radio frequency, the Sigma Delta Modulator ([Formula: see text] M) based on LC resonators is a suitable option for use in Software-Defined Radio (SDR). However, some aspects of the topologies described in the state-of-the-art, such as noise and nonlinear sources, affect the performance of [Formula: see text] M. This paper presents the design methodology of three high-order LC-Based single-block Sigma Delta Modulators. The method is based on the equivalence between continuous time and discrete time loop gain using a Finite Impulse Response Digital-to-Analog Converter (FIRDAC) through a numerical approach to defining the coefficients. The continuous bandpass LC [Formula: see text] M simulations are performed at a center frequency of 432 MHz and a sampling frequency of 1.72 GHz. To the proposed modulators a maximum Signal-to-Noise Ratio (SNR) of 51.39 dB, 48.48 dB, and 46.50 dB in a 4 MHz bandwidth was achieved to respectively 4th Order Gm-LC [Formula: see text] M, 4th Order Magnetically Coupled [Formula: see text] M and 4th Order Capacitively Coupled [Formula: see text] M. |
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