📄 ch13.a.htm
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d<SPAN CLASS="EquationVariables">
I</SPAN>
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<SPAN CLASS="EquationVariables">
V</SPAN>
<SUB CLASS="SubscriptVariable">
P</SUB>
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=</P>
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–<SPAN CLASS="EquationVariables">
L</SPAN>
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–––</P>
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(13.30)</P>
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d<SPAN CLASS="EquationVariables">
t</SPAN>
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=</P>
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–10 nH (4 <SPAN CLASS="Symbol">
¥</SPAN>
10<SUP CLASS="Superscript">
6</SUP>
) As<SUP CLASS="Superscript">
–1</SUP>
</P>
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=</P>
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–40 mV</P>
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<P CLASS="BodyAfterHead">
<A NAME="pgfId=4103">
</A>
The result is a glitch in the power supply voltage during the buffer output transient. This is known as <A NAME="marker=4099">
</A>
<SPAN CLASS="Definition">
supply bounce</SPAN>
or <A NAME="marker=4102">
</A>
<SPAN CLASS="Definition">
ground bounce</SPAN>
. To limit the amount of bounce we may do one of two things:</P>
<OL>
<LI CLASS="NumberFirst">
<A NAME="pgfId=4107">
</A>
Limit the power supply lead inductance (minimize L)</LI>
<LI CLASS="NumberList">
<A NAME="pgfId=4109">
</A>
Reduce the current pulse (minimize dI/dt)</LI>
</OL>
<P CLASS="Body">
<A NAME="pgfId=4113">
</A>
We can work on the first solution by careful design of the packages and by using parallel bonding wires (inductors add in series, reduce in parallel). </P>
</DIV>
<DIV>
<H2 CLASS="Heading2">
<A NAME="pgfId=18842">
</A>
13.10.2 SPICE Models</H2>
<P CLASS="BodyAfterHead">
<A NAME="pgfId=19092">
</A>
<A HREF="CH13.a.htm#25633" CLASS="XRef">
Table 13.14</A>
shows the SPICE parameters for the typical 0.5 <SPAN CLASS="Symbol">
m</SPAN>
m CMOS process (0.6 <SPAN CLASS="Symbol">
m</SPAN>
m drawn gate length), G5, that we used in <A HREF="/Humuhumu/from Antibes/Prof.htm#13612" CLASS="XRef">
Section 2.1</A>
. These <SPAN CLASS="BodyComputer">
LEVEL = 3</SPAN>
parameters may be used with Spice3, PSpice, and HSPICE (see also <A HREF="/Humuhumu/from Antibes/Prof.htm#33387" CLASS="XRef">
Table 2.1</A>
and <A HREF="/Humuhumu/from Antibes/Prof.htm#31594" CLASS="XRef">
Figure 2.4</A>
).</P>
<TABLE>
<TR>
<TD ROWSPAN="1" COLSPAN="6">
<P CLASS="TableTitle">
<A NAME="pgfId=106425">
</A>
TABLE 13.14 <A NAME="25633">
</A>
SPICE transistor model parameters ( <SPAN CLASS="BodyComputer">
LEVEL = 3</SPAN>
). </P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=106444">
</A>
<SPAN CLASS="TableHeads">
SPICE<BR>
parameter<A HREF="#pgfId=106448" CLASS="footnote">
1</A>
</SPAN>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=106450">
</A>
<SPAN CLASS="TableHeads">
n-channel</SPAN>
</P>
<P CLASS="Table">
<A NAME="pgfId=106451">
</A>
<SPAN CLASS="TableHeads">
value</SPAN>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=106453">
</A>
<SPAN CLASS="TableHeads">
p-channel</SPAN>
</P>
<P CLASS="Table">
<A NAME="pgfId=106454">
</A>
<SPAN CLASS="TableHeads">
value</SPAN>
</P>
<P CLASS="Table">
<A NAME="pgfId=106455">
</A>
<SPAN CLASS="TableHeads">
(if different)</SPAN>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=106457">
</A>
<SPAN CLASS="TableHeads">
Units<A HREF="#pgfId=106801" CLASS="footnote">
2</A>
</SPAN>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=106459">
</A>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=106461">
</A>
<SPAN CLASS="TableHeads">
Explanation</SPAN>
</P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=106464">
</A>
<SPAN CLASS="BodyComputer">
CGBO </SPAN>
<A NAME="marker=106463">
</A>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=106466">
</A>
<SPAN CLASS="BodyComputer">
4.0E-10</SPAN>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=106468">
</A>
3.8E-10</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=106470">
</A>
Fm<SUP CLASS="Superscript">
–1</SUP>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=106472">
</A>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=106474">
</A>
Gate–bulk overlap capacitance (CGBoh, not CGBzero)</P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=106477">
</A>
<SPAN CLASS="BodyComputer">
</SPAN>
<A NAME="marker=106476">
</A>
CGDO </P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=106479">
</A>
<SPAN CLASS="BodyComputer">
3.0E-10</SPAN>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=106481">
</A>
2.4E-10</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=106483">
</A>
Fm<SUP CLASS="Superscript">
–1</SUP>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=106485">
</A>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=106487">
</A>
Gate–drain overlap capacitance (CGDoh, not CGDzero)</P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=106490">
</A>
<SPAN CLASS="BodyComputer">
CGSO </SPAN>
<A NAME="marker=106489">
</A>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=106492">
</A>
<SPAN CLASS="BodyComputer">
3.0E-10</SPAN>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=106494">
</A>
2.4E-10</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=106496">
</A>
Fm<SUP CLASS="Superscript">
–1</SUP>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=106498">
</A>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=106500">
</A>
Gate–source overlap capacitance (CGSoh, not CGSzero)</P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=106503">
</A>
<SPAN CLASS="BodyComputer">
CJ </SPAN>
<A NAME="marker=106502">
</A>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=106505">
</A>
<SPAN CLASS="BodyComputer">
5.6E-4</SPAN>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=106507">
</A>
9.3E-4</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=106509">
</A>
Fm<SUP CLASS="Superscript">
–2</SUP>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=106511">
</A>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=106513">
</A>
Junction area capacitance</P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=106516">
</A>
<SPAN CLASS="BodyComputer">
CJSW </SPAN>
<A NAME="marker=106515">
</A>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=106518">
</A>
<SPAN CLASS="BodyComputer">
5E-11</SPAN>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=106520">
</A>
2.9E-10</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="TableLeft">
<A NAME="pgfId=106522">
</A>
Fm<SUP CLASS="Superscript">
–1</SUP>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=106524">
</A>
</P>
</TD>
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