Backplane Channel Design Exploration at 112 Gbps Using Channel Operating Margin (COM)

Paulis, Francesco de; Wang-Lee, Tim; Mellitz, Richard; Resso, Mike; Rabinovich, Rick; Danzy, O.J.

doi:10.1109/emcsi38923.2020.9191569

Cited by 11 publications

(7 citation statements)

References 8 publications

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“…Since three networks are being cascaded, the nominal form of the compact matrix relationship in (5) should be expanded as in (9). However, each element in [b] and [a] is, in general, a vector; whereas each element in the S-parameter matrix and each "0" are submatrices of rectangular dimensions, according to the input and output ports of each network.…”

Section: Cascade Of Three Network Characterized By Different Number O...mentioning

confidence: 99%

“…[3][4][5][6][7] Multipin connectors currently developed to assemble PCBs and cables for the up-to-date ethernet communications up to 100 Gbps per single channel lane is another example. 8,9 From a modeling point of view the multiport S-parameters can effectively describe multilayer PCBs structure such as DDR4 memories, 5 signal busses [10][11][12] and vias [13][14][15][16][17] or signal integrity analysis effects such as crosstalk. [18][19][20] Moreover, the analysis of power integrity for decoupling capacitor placement and optimization is carried out by modeling the entire power distribution network (PDN) by large S-parameters networks that need to be assembled taking into account, in general, multiple power layers in the multilayer stack-up and even hundreds of ports for capacitor connections.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Single‐step algorithm for the cascade assembly of multiple S‐parameters based multiports networks

Paulis

Scafati

Olivieri

et al. 2022

Int J RF Mic Comp-Aid Eng

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The complexity of electronic systems for RF and digital applications is ever increasing, and the corresponding compliance analysis for ensuring the required specifications in terms of performances, signal and power integrity is a challenging task often accomplished by relying on commercial circuit simulators. The modeling of multiport devices involves the assembly of electrical networks usually described in terms of S-parameter. This work proposes a new single-step algorithm that computes the global S-parameter matrix for a cascade of multiple networks with multiple ports without the need of any S-parameter transformation in T-parameters and their inverse transformation. The proposed method involves the construction of a large matrix filled with all S-parameters of all networks, and the subsequent evaluation of only one matrix expression. The proposed method is shown to be very efficient and reliable, since it can be easily automated without the need of a manual connections of tens or even hundreds of ports of the multiple blocks, which is an action that needs to be performed within a typical circuit simulator environment. Also, the proposed method overcomes the limitation of the standard method based on S-to-T parameter transformation since it is of general applicability to networks with different number of input and output ports. Examples involving the cascade of multiple 2-ports and multiports networks are considered, and the results are validated and compared with the reference results obtained from a commercial circuit simulator. The proposed method is shown to be effective and fast compared to its counterpart based on the T-parameters.

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Section: Cascade Of Three Network Characterized By Different Number O...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Single‐step algorithm for the cascade assembly of multiple S‐parameters based multiports networks

Paulis

Scafati

Olivieri

et al. 2022

Int J RF Mic Comp-Aid Eng

View full text Add to dashboard Cite

show abstract

“…All components of the solution are linearly dependent on C. The solution of the non-linear equation system in (13) can be achieved by a two step process: first, the linear system (13) can be solved first as function of the parameter C, and then the non-linear equation in (11e) can be solved. By assuming that the matrix A is not singular, the unique solution of the linear system depending on C is given by (15):…”

Section: Single-step Algorithm For Device Under Test (Dut) De-embeddingmentioning

confidence: 99%

“…The connector itself, the DUT in Figure 3a,b, is described in [13], developed in the form of a full wave three-dimensional model by SAMTEC [14], and its S-parameters evaluated up to 50 GHz. The S-parameters and the equivalent circuit of the left (FL) and right (FR) fixtures in Figure 3b,c.…”

Section: Validation Of the Proposed Single-step De-embeddingmentioning

confidence: 99%

Single Step 2-Port Device De-Embedding Algorithm for Fixture-DUT-Fixture Network Assembly

et al. 2021

Self Cite

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The de-embedding of measurement fixtures is relevant for an accurate experimental characterization of radio frequency and digital electronic devices. The standard technique consists in removing the effects of the measurement fixtures by the calculation of the transfer scattering parameters (T-parameters) from the available measured (or simulated) global scattering parameters (S-parameters). The standard de-embedding is achieved by a multiple steps process, involving the S-to-T and subsequent T-to-S parameter conversion. In a typical measurement setup, two fixtures are usually placed before and after the device under test (DUT) allowing the connection of the device to the calibrated vector network analyzer coaxial ports. An alternative method is proposed in this paper: it is based on the newly developed multi-network cascading algorithm. The matrices involved in the fixture-DUT-fixture cascading gives rise to a non-linear set of equations that is in one step analytically solved in closed form, obtaining a unique solution. The method is shown to be effective and at least as accurate as the standard multi-step de-embedding one.

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“…For example, Bradon Gone et al make comparisons between COM and An-nex69B for 10Gb/s Ethernet (10GbE) channel evaluation, illustrating that the former outperforms the latter in accuracy [5]. Francesco et al develop and validate a physical model of 400GbE channel depending on COM, moreover they make trade-off among channel length, losses and crosstalk and also select viable channel solutions based on COM [6]. Mike Resso et al present a COM based backplane characterization techniques to alleviate the conflict that old backplane faces the new product generations [7].…”

Section: Introductionmentioning

confidence: 99%

A COM Based High Speed Serial Link Optimization Using Machine Learning

Yan

2022

IEICE Trans. Electron.

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This paper presents a channel operating margin (COM) based high-speed serial link optimization using machine learning (ML). COM that is proposed for evaluating serial link is calculated at first and during the calculation several important equalization parameters corresponding to the best configuration are extracted which can be used for the ML modeling of serial link. Then a deep neural network containing hidden layers are investigated to model a whole serial link equalization including transmitter feed forward equalizer (FFE), receiver continuous time linear equalizer (CTLE) and decision feedback equalizer (DFE). By training, validating and testing a lot of samples that meet the COM specification of 400GAUI-8 C2C, an effective ML model is generated and the maximum relative error is only 0.1 compared with computation results. At last 3 link configurations are discussed from the view of tradeoff between the link performance and cost, illustrating that our COM based ML modeling method can be applied to advanced serial link design for NRZ, PAM4 or even other higher level pulse amplitude modulation signal.

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Backplane Channel Design Exploration at 112 Gbps Using Channel Operating Margin (COM)

Cited by 11 publications

References 8 publications

Single‐step algorithm for the cascade assembly of multiple S‐parameters based multiports networks

Single‐step algorithm for the cascade assembly of multiple S‐parameters based multiports networks

Single Step 2-Port Device De-Embedding Algorithm for Fixture-DUT-Fixture Network Assembly

A COM Based High Speed Serial Link Optimization Using Machine Learning

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