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A 1 MHz bandwidth, filtering continuous-time delta-sigma ADC with 36 dBFS out-of-band IIP3 and 76 dB SNDR
, Saravana Manivannan
Published in Institute of Electrical and Electronics Engineers Inc.
2018
Pages: 1 - 4
Abstract
The high dynamic range of CTΔΣMs used in wireless receivers, needed to accommodate large out-of-band interferers, can be reduced by using a filter up front. Embedding the filter inside the modulator loop is more power efficient. Prior work has embedded a Tow-Thomas biquad inside the ADC. We show that using a Rauch filter instead yields higher out-of-band linearity (for the same power dissipation) due to the passive-RC filtering inherent in the Rauch structure. The theory is borne out by measurements from a 1 MHz bandwidth CTΔΣM with an embedded second-order Rauch filter, achieving 76 dB SNDR and 36 dBFS out-of-band IIP3 while consuming 2.2 mW in a 65 nm CMOS process1. © 2018 IEEE.
About the journal
JournalData powered by Typeset2018 IEEE Custom Integrated Circuits Conference, CICC 2018
PublisherData powered by TypesetInstitute of Electrical and Electronics Engineers Inc.
Open AccessNo
Concepts (12)
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    Analog to digital conversion
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    Bandwidth
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    Continuous time systems
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    Cmos processs
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    Continuous-time
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    DELTA-SIGMA ADC
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    High dynamic range
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    POWER EFFICIENT
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    RC-FILTERING
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    Second orders
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    WIRELESS RECEIVERS
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    Passive filters