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jaseg 2024-09-19 17:30:57 +02:00
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@ -149,7 +149,7 @@ The trace trajectory of a standard planar spiral inductor can be parameterized i
an Archimedean spiral: \todo{For the lulz, cite Archimedes here}
\begin{equation}
r &= a\cdot\phi
r = a\cdot\phi
\label{eqn_arch_spi_basic}
\end{equation}
@ -157,18 +157,18 @@ An Archimedean spiral defined this way always starts at the origin, and it conti
this spiral to a curve parameter $t$ with range $\left[0,1\right]$.
inductor has a defined inner radius $r_0$ and outer radius $r_1$, and a
fixed turn count $n$. Let us further re-parameterize the spiral to a curve parameter $t$ with range $\left\[0,
1\right\]$. Taking into account that the input ports of a spiral inductor are usually placed on the outside of the
spiral, we define the inductor's first port to lie at $\left\(\phi, r\right\)=\left\(0, r_1\right\)$, and we define that
fixed turn count $n$. Let us further re-parameterize the spiral to a curve parameter $t$ with range $\left[0,
1\right]$. Taking into account that the input ports of a spiral inductor are usually placed on the outside of the
spiral, we define the inductor's first port to lie at $\left(\phi, r\right)=\left(0, r_1\right)$, and we define that
this corresponds to $t=0$. The resulting parametrization is:
\begin{align}
r &= r_1 - \frac{t}{n} \cdot \left\(r_1 - r_0\right\) \\
r &= r_1 - \frac{t}{n} \cdot \left(r_1 - r_0\right) \\
\phi &= 2\pi \cdot n \cdot t
\label{eqn_simple_spiral_ind}
\end{align}
For integer $n$, the spiral's second port will lie at $\left\(\phi, r\right\)=\left\(0, r_0\right\)$, however, other
For integer $n$, the spiral's second port will lie at $\left(\phi, r\right)=\left(0, r_0\right)$, however, other
values of $n$ are possible, which will rotate the second port around the coordinate origin.
%Let us further flip the radial coordinate axis such that the spiral's outer end is at $\phi=0$
@ -177,6 +177,18 @@ values of $n$ are possible, which will rotate the second port around the coordin
\subsection{From Spiral to Twisted Inductor}
\begin{figure*}
\begin{center}
\includegraphics[width=\textwidth]{figures/nk_simple_illust.pdf}
\end{center}
\end{figure*}
\begin{figure*}
\begin{center}
\includegraphics[width=\textwidth]{figures/nk_complex_illust.pdf}
\end{center}
\end{figure*}
\subsubsection{Ohmic Resistance}
\subsubsection{Inductance}