By Yves Geerts
Layout of Multi-Bit Delta-Sigma A/D Converters discusses either structure and circuit layout features of Delta-Sigma A/D converters, with a distinct concentrate on multi-bit implementations. The emphasis is on high-speed high-resolution converters in CMOS for ADSL functions, even though the fabric is also utilized for different specification targets and applied sciences. layout of Multi-Bit Delta-Sigma A/D Converters begins with a normal advent of the suggestions of Delta-Sigma converters. a large number of architectures are mentioned, starting from single-loop to cascaded and numerous multi-bit topologies. those topologies are optimized to acquire good converters with a excessive accuracy. a transparent assessment is supplied of the utmost available functionality of every topology, which permits a fashion designer to pick the optimum structure for a definite specification. unique awareness is paid to multi-bit architectures and attainable suggestions for the linearity challenge of the DA converter within the suggestions loop of converters. numerous circuit layout points of multi-bit Delta-Sigma converters are mentioned. a variety of versions are supplied for quite a lot of linear and non-linear circuit imperfections, that can degrade the functionality of the converter. those versions let the clothier to figure out the required requirements for different development blocks and shape the foundation of a scientific layout strategy. The provided fabric is mixed in a concluding bankruptcy, which illustrates the systematic layout approach for 2 high-performance converters. layout of Multi-Bit Delta-Sigma A/D Converters offers a transparent comparability of architectures and yields perception into the impression of an important circuit non-idealities. it's going to let you layout powerful and high-performance Delta-Sigma advert converters in a shorter time. it really is crucial analyzing for analog layout engineers and researchers within the box of advert converters and it's also appropriate as a textual content for a sophisticated path at the topic.
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Extra resources for Design of Multi-Bit Delta-Sigma A/D Converters (THE KLUWER INTERNATIONAL SERIES IN ENGINEERING AND (The Springer International Series in Engineering and Computer Science)
1 The system H : U → Y with input u ∈ U and output y ∈ Y is said to be passive if there exists a constant β ≥ 0 such that τ y T (t)u(t)dt ≥ −β 0 for all input signals u ∈ U and for all τ ∈ R+ . In addition, H is said to be © Springer International Publishing Switzerland 2015 T. 1007/978-3-319-15171-7_2 31 32 2 Foundation: Passivity, Stability and Passivity-Based Motion Control Fig. 1 Remark that passivity is also defined for a static map h : R p → R p . In the case, a static map h : R p → R p is passive if the inequality (h(u))T u ≥ 0 holds for all u ∈ R p .
7 is also passive from input u = u1 = u2 to output y = y1 + y2 . Finally, we consider the system H1 . Let us now transform the input u1 and output y1 as u1 = M(x1 )u¯ 1 and y¯1 = M T (x1 )y1 , respectively, using a matrix M(x1 ) ∈ R p×q . Then, it is straightforward to prove the following theorem for the system in Fig. 8 from the transformed input u¯ to transformed output y¯ . Fig. 5 Block diagram of Hey 8 The notation e ≡ 0 for any signal e means e(t) = 0 ∀t ∈ R+ . 1 Passivity 39 Fig. 6 Block diagram of He1 y1 Fig.
4) • output strictly passive if there exists a scalar δ y > 0 such that τ S(x(τ )) − S(x0 ) ≤ y T (t)u(t) − δ y y(t) 2 0 for all input signals u : [0, τ ] → R p , initial states x0 ∈ Rn and τ ∈ R+ . These two definitions are closely related to each other. 1) is known to define a causal4 input–output mapping Hx0 : U → Y . 2) is nonnegative, we have τ y T (t)u(t)dt ≥ −S(x0 ). 1. The same statements hold for both of the input and output strict passivity. 2 except for a portion of Part I. 2) can be transformed into another form.