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Improved Continuous-Time Delta-Sigma Modulators With Embedded Active Filtering
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DOI：10.1109/TCSI.2020.3013006.png)
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Abstract
En 中文
Continuous-time Delta Sigma modulators used in wireless transceivers need to digitize small desired signals that are accompanied by large out-of-band interferers. In such applications, it is desirable that the CT Delta Sigma M have a low-pass signal transfer function whose bandwidth can be specified. Many architectures present themselves as potential candidates to realize such filtering-CT Delta Sigma Ms. This work investigates these threads and concludes that a CT Delta Sigma M with an embedded Rauch filter is a compelling design choice. The theory is supported by measurement results from a filtering-CT Delta Sigma M test chip that achieves a peak SNDR of 76.7dB in a 1MHz signal bandwidth. Measurements demonstrate improved power efficiency and out-of-band linearity when compared to prior art.
Keywords:
Modulation
Linearity
Bandwidth
Finite impulse response filters
Topology
Intermodulation distortion
Compensation
continuous-time
filtering
analog-to-digital converters (ADC)
FIR DAC
oversampling
sigma-delta
dummy-switching
interferers
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