From 424402c3aee34b76fc5e773d58133d17f8ac6a66 Mon Sep 17 00:00:00 2001 From: jaseg Date: Thu, 31 Oct 2024 17:33:31 +0100 Subject: [PATCH] Work on related work --- paper/paper.tex | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/paper/paper.tex b/paper/paper.tex index 95ecc51..5dce2e6 100644 --- a/paper/paper.tex +++ b/paper/paper.tex @@ -124,7 +124,7 @@ turns of a cylindrical multilayer inductor not layer by layer, but instead layer connecting adjacent turns in a diagonal zigzag pattern. Then as now, wound inductors applying this technique were not feasible to manufacture reliably by machine, but the technique can be closely replicated in PCB inductors as shown in \textcite{leePrintedSpiralWinding2011a}. The main limiting factors in a PCB implementation are the requirement for a -large number of vias inside the inductor's turns limiting the achievable turn count\footnotes{In PCBs, as opposed to +large number of vias inside the inductor's turns limiting the achievable turn count\footnote{In PCBs, as opposed to ICs, vias limit the achievablie turn count when they need to be placed in-line inside the turns as opposed to on the inside or outside because a PCB's minimum trace/space widths are usually much smaller than the smallest feasible via, consisting of a minimum-size drill surrounded by a minimum-size annular ring.} and increasing ESR through the thin trace @@ -212,6 +212,15 @@ commonly used for two-layer planar inductors\cite{lopeFirstSelfResonant2021,sproHighVoltageInsulationDesign2021,leePrintedSpiralWinding2011a}, and which has been used to stack planar coils for more than a century\cite{flemingPrinciplesElectricWave1910}. +Another, more recent design interleaves two counter-wound planar spiral inductors on the same layer with the help of +some jumper connections on a second layer, as shown in \cite{daneshDifferentiallyDrivenSymmetric2002}. The use of this +design in RFIC design is mainly focused on its electrical symmetry, so that the two input ports can be fed with a fully +differential signal, with both driver outputs being loaded equally across the inductor's frequency range. + +% They note that the main point behind the design is electrical symmetry of the two ports to make driving the thing +% differentially cleaner. We should adopt this observation for our inductors, which likewise are electrically symmetric +% when compared to a single-layer spiral inductor. + \subsection{Inductive Wireless Power Transfer in Practice} Inductive WPT has been proposed in a large number of scenarios, each of which comese with a set of