ch13.a.htm

介绍asci设计的一本书

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RSH </P>
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2</SPAN>
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&nbsp;</P>
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<SPAN CLASS="Symbol">
W  / </SPAN>
square</P>
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&nbsp;</P>
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Sheet resistance of source and drain</P>
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THETA </P>
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<A NAME="pgfId=106713">
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<SPAN CLASS="BodyComputer">
0.27</SPAN>
</P>
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<A NAME="pgfId=106715">
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<SPAN CLASS="BodyComputer">
0.29</SPAN>
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<P CLASS="TableLeft">
<A NAME="pgfId=106717">
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V<SUP CLASS="Superscript">
&#8211;1</SUP>
</P>
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<A NAME="pgfId=106719">
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&nbsp;</P>
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<A NAME="pgfId=106721">
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Mobility-degradation factor</P>
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TOX </P>
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<SPAN CLASS="BodyComputer">
1E-8</SPAN>
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&nbsp;</P>
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m</P>
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&nbsp;</P>
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Gate-oxide thickness</P>
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<SPAN CLASS="BodyComputer">
TPG </SPAN>
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<SPAN CLASS="BodyComputer">
1</SPAN>
</P>
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<A NAME="pgfId=106741">
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<SPAN CLASS="BodyComputer">
-1</SPAN>
</P>
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<A NAME="pgfId=106743">
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none</P>
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<A NAME="pgfId=106745">
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&nbsp;</P>
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<A NAME="pgfId=106747">
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Type of polysilicon gate</P>
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<A NAME="pgfId=106750">
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<SPAN CLASS="BodyComputer">
U0</SPAN>
</P>
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<A NAME="pgfId=106752">
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<SPAN CLASS="BodyComputer">
550</SPAN>
</P>
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<A NAME="pgfId=106754">
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<SPAN CLASS="BodyComputer">
135</SPAN>
</P>
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<A NAME="pgfId=106756">
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cm<SUP CLASS="Superscript">
2</SUP>
V<SUP CLASS="Superscript">
&#8211;1</SUP>
s<SUP CLASS="Superscript">
&#8211;1</SUP>
</P>
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<A NAME="pgfId=106758">
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&nbsp;</P>
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<A NAME="pgfId=106760">
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Low-field bulk carrier mobility (Uzero, not Uoh)</P>
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<TR>
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<P CLASS="TableLeft">
<A NAME="pgfId=106763">
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<SPAN CLASS="BodyComputer">
</SPAN>
<A NAME="marker=106762">
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XJ </P>
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<P CLASS="Table">
<A NAME="pgfId=106765">
 </A>
<SPAN CLASS="BodyComputer">
0.2E-6</SPAN>
</P>
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<P CLASS="Table">
<A NAME="pgfId=106767">
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&nbsp;</P>
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<A NAME="pgfId=106769">
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m</P>
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<A NAME="pgfId=106771">
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&nbsp;</P>
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Junction depth</P>
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VMAX </P>
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<A NAME="pgfId=106778">
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2E5</SPAN>
</P>
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<A NAME="pgfId=106780">
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2.5E5</P>
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<A NAME="pgfId=106782">
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ms<SUP CLASS="Superscript">
&#8211;1</SUP>
</P>
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&nbsp;</P>
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Saturated carrier velocity</P>
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<A NAME="pgfId=106789">
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</SPAN>
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VTO </P>
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<TD ROWSPAN="1" COLSPAN="1">
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<A NAME="pgfId=106791">
 </A>
<SPAN CLASS="BodyComputer">
0.65</SPAN>
</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Table">
<A NAME="pgfId=106793">
 </A>
<SPAN CLASS="BodyComputer">
-0.92</SPAN>
</P>
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<P CLASS="TableLeft">
<A NAME="pgfId=106795">
 </A>
V</P>
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<A NAME="pgfId=106797">
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&nbsp;</P>
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<A NAME="pgfId=106799">
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Zero-bias threshold voltage (VTzero, not VToh)</P>
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<P CLASS="Body">
<A NAME="pgfId=105322">
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There are several levels of the SPICE MOSFET models, the following is a simplified overview (a huge number of confusing variations, fixes, and options have been added to these models&#8212;see Meta Software&#8217;s HSPICE User&#8217;s Manual, Vol.&nbsp;II, for a comprehensive description [<A NAME="[HSpice User誷 Manual, 1996c]">
 </A>
1996]):</P>
<OL>
<LI CLASS="NumberFirst">
<A NAME="pgfId=108218">
 </A>
<SPAN CLASS="BodyComputer">
LEVEL  =  1</SPAN>
 (<A NAME="marker=108257">
 </A>
<SPAN CLASS="Definition">
Schichman&#8211;Hodges model</SPAN>
) uses the simple square-law <SPAN CLASS="EquationVariables">
I</SPAN>
<SUB CLASS="SubscriptVariable">
DS</SUB>
&#8211;<SPAN CLASS="EquationVariables">
V</SPAN>
<SUB CLASS="SubscriptVariable">
DS</SUB>
 relation we derived in Section&nbsp;2.1 (Eqs.&nbsp;2.9 and 2.12).</LI>
<LI CLASS="NumberList">
<A NAME="pgfId=108241">
 </A>
<SPAN CLASS="BodyComputer">
LEVEL  =  2</SPAN>
 (<A NAME="marker=108258">
 </A>
<SPAN CLASS="Definition">
Grove&#8211;Frohman model</SPAN>
) uses the 3/2 power equations that result if we include the variation of threshold voltage across the channel.</LI>
<LI CLASS="NumberList">
<A NAME="pgfId=108248">
 </A>
<SPAN CLASS="BodyComputer">
LEVEL  =  3</SPAN>
 (<SPAN CLASS="Definition">
empirical model</SPAN>
<A NAME="marker=108870">
 </A>
) uses empirical equations.</LI>
<LI CLASS="NumberList">
<A NAME="pgfId=108259">
 </A>
The UCB <A NAME="marker=108482">
 </A>
<SPAN CLASS="Definition">
BSIM1</SPAN>
 model (~1984, PSpice <SPAN CLASS="BodyComputer">
LEVEL  =  4</SPAN>
, HSPICE <SPAN CLASS="BodyComputer">
LEVEL  =  13</SPAN>
) focuses on modeling observed device data rather than on device physics. A commercial derivative (HSPICE <SPAN CLASS="BodyComputer">
LEVEL  =  28</SPAN>
<A NAME="marker=108489">
 </A>
) is widely used by ASIC vendors. </LI>
<LI CLASS="NumberList">
<A NAME="pgfId=108281">
 </A>
The UCB <SPAN CLASS="Definition">
BSIM2</SPAN>
 model (~1991, the commercial derivative is HSPICE <SPAN CLASS="BodyComputer">
LEVEL  =  39</SPAN>
<A NAME="marker=108490">
 </A>
) improves modeling of subthreshold conduction.</LI>
<LI CLASS="NumberList">
<A NAME="pgfId=108495">
 </A>
The UCB <SPAN CLASS="Definition">
BSIM3</SPAN>
 model (~1995, the commercial derivative is HSPICE <SPAN CLASS="BodyComputer">
LEVEL  =  49</SPAN>
<A NAME="marker=108574">
 </A>
) corrects potential nonphysical behavior of earlier models.</LI>
<TABLE>
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<TD ROWSPAN="1" COLSPAN="2">
<P CLASS="TableTitle">
<A NAME="pgfId=108504">
 </A>
TABLE&nbsp;13.15&nbsp;<A NAME="31851">
 </A>
PSpice parameters for process G5 (PSpice <SPAN CLASS="BodyComputer">
LEVEL  =  4</SPAN>
).<A HREF="#pgfId=108502" CLASS="footnote">
3</A>
</P>
</TD>
</TR>
<TR>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Computer">
<A NAME="pgfId=108508">
 </A>
.MODEL NM1 NMOS LEVEL=4 </P>
<P CLASS="Computer">
<A NAME="pgfId=108509">
 </A>
+ VFB=-0.7, LVFB=-4E-2, WVFB=5E-2</P>
<P CLASS="Computer">
<A NAME="pgfId=108510">
 </A>
+ PHI=0.84, LPHI=0, WPHI=0</P>
<P CLASS="Computer">
<A NAME="pgfId=108511">
 </A>
+ K1=0.78, LK1=-8E-4, WK1=-5E-2</P>
<P CLASS="Computer">
<A NAME="pgfId=108512">
 </A>
+ K2=2.7E-2, LK2=5E-2, WK2=-3E-2</P>
<P CLASS="Computer">
<A NAME="pgfId=108513">
 </A>
+ ETA=-2E-3, LETA=2E-02, WETA=-5E-3</P>
<P CLASS="Computer">
<A NAME="pgfId=108514">
 </A>
+ MUZ=600, DL=0.2, DW=0.5</P>
<P CLASS="Computer">
<A NAME="pgfId=108515">
 </A>
+ U0=0.33, LU0=0.1, WU0=-0.1</P>
<P CLASS="Computer">
<A NAME="pgfId=108516">
 </A>
+ U1=3.3E-2, LU1=3E-2, WU1=-1E-2</P>
<P CLASS="Computer">
<A NAME="pgfId=108517">
 </A>
+ X2MZ=9.7, LX2MZ=-6, WX2MZ=7</P>
<P CLASS="Computer">
<A NAME="pgfId=108518">
 </A>
+ X2E=4.4E-4, LX2E=-3E-3, WX2E=9E-4</P>
<P CLASS="Computer">
<A NAME="pgfId=108519">
 </A>
+ X3E=-5E-5, LX3E=-2E-3, WX3E=-1E-3</P>
<P CLASS="Computer">
<A NAME="pgfId=108520">
 </A>
+ X2U0=-1E-2, LX2U0=-1E-3, WX2U0=5E-3</P>
<P CLASS="Computer">
<A NAME="pgfId=108521">
 </A>
+ X2U1=-1E-3, LX2U1=1E-3, WX2U1=-7E-4</P>
<P CLASS="Computer">
<A NAME="pgfId=108522">
 </A>
+ MUS=700, LMUS=-50, WMUS=7</P>
<P CLASS="Computer">
<A NAME="pgfId=108523">
 </A>
+ X2MS=-6E-2, LX2MS=1, WX2MS=4</P>
<P CLASS="Computer">
<A NAME="pgfId=108524">
 </A>
+ X3MS=9, LX3MS=2, WX3MS=-6</P>
<P CLASS="Computer">
<A NAME="pgfId=108525">
 </A>
+ X3U1=9E-3, LX3U1=2E-4, WX3U1=-5E-3</P>
<P CLASS="Computer">
<A NAME="pgfId=108526">
 </A>
+ TOX=1E-2, TEMP=25, VDD=5</P>
<P CLASS="Computer">
<A NAME="pgfId=108527">
 </A>
+ CGDO=3E-10, CGSO=3E-10, CGBO=4E-10</P>
<P CLASS="Computer">
<A NAME="pgfId=108528">
 </A>
+ XPART=1</P>
<P CLASS="Computer">
<A NAME="pgfId=108529">
 </A>
+ N0=1, LN0=0, WN0=0</P>
<P CLASS="Computer">
<A NAME="pgfId=108530">
 </A>
+ NB=0, LNB=0, WNB=0</P>
<P CLASS="Computer">
<A NAME="pgfId=108531">
 </A>
+ ND=0, LND=0, WND=0</P>
<P CLASS="Computer">
<A NAME="pgfId=108532">
 </A>
* n+ diffusion </P>
<P CLASS="Computer">
<A NAME="pgfId=108533">
 </A>
+ RSH=2.1, CJ=3.5E-4, CJSW=2.9E-10</P>
<P CLASS="Computer">
<A NAME="pgfId=108534">
 </A>
+ JS=1E-8, PB=0.8, PBSW=0.8</P>
<P CLASS="Computer">
<A NAME="pgfId=108535">
 </A>
+ MJ=0.44, MJSW=0.26, WDF=0</P>
<P CLASS="Computer">
<A NAME="pgfId=108536">
 </A>
*, DS=0</P>
</TD>
<TD ROWSPAN="1" COLSPAN="1">
<P CLASS="Computer">
<A NAME="pgfId=108538">
 </A>
.MODEL PM1 PMOS LEVEL=4 </P>
<P CLASS="Computer">
<A NAME="pgfId=108539">
 </A>
+ VFB=-0.2, LVFB=4E-2, WVFB=-0.1</P>
<P CLASS="Computer">
<A NAME="pgfId=108540">
 </A>
+ PHI=0.83, LPHI=0, WPHI=0</P>
<P CLASS="Computer">
<A NAME="pgfId=108541">
 </A>
+ K1=0.35, LK1=-7E-02, WK1=0.2</P>
<P CLASS="Computer">
<A NAME="pgfId=108542">
 </A>
+ K2=-4.5E-2, LK2=9E-3, WK2=4E-2</P>
<P CLASS="Computer">
<A NAME="pgfId=108543">
 </A>
+ ETA=-1E-2, LETA=2E-2, WETA=-4E-4</P>
<P CLASS="Computer">
<A NAME="pgfId=108544">
 </A>
+ MUZ=140, DL=0.2, DW=0.5</P>