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Optimized Zero Placement within Noise Coupling Transfer Functions for Oversampled ADCs | IEEE Conference Publication | IEEE Xplore

Optimized Zero Placement within Noise Coupling Transfer Functions for Oversampled ADCs


Abstract:

This paper presents an approach to optimally place noise coupling transfer functions (NCFs) zeros across the passband using oversampled analog-to-digital converters (ADCs...Show More

Abstract:

This paper presents an approach to optimally place noise coupling transfer functions (NCFs) zeros across the passband using oversampled analog-to-digital converters (ADCs). In addition, the presented optimization method is extended to account for and ultimately compensate NCF coefficient mismatch effects just using a single parameter only. As a result, NCF coefficient matching requirements are significantly relaxed enabling the robust design of accurate wideband oversampled data converters. The proposed technique is applied to two different ΣΔ ADCs both incorporating a second-order NCFs. For both ADCs, the optimal NCF zero placement is analytically calculated and verified through simulations. NCF coefficient mismatch simulations with the proposed single parameter compensation enabled, reveal a relaxed NCF coefficient matching requirement by a factor of 4× with only minor quantization noise penalties. Hence, the (analog) NCF filter area largely shrinks in size enabling ultra-compact oversampled ADCs.
Date of Conference: 26-29 May 2019
Date Added to IEEE Xplore: 01 May 2019
Print ISBN:978-1-7281-0397-6
Print ISSN: 2158-1525
Conference Location: Sapporo, Japan

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