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3.8 Pole/Zero Analysis 329
Tolerance
Tolerance −> tol specifies the radius of the tolerance region around the initial guess theta0 in which
the sought eigenvalue Λ should lie. ApproximateDeterminant generates a warning if it converges
to an eigenvalue that lies outside the tolerance region. The Tolerance option allows you to check
whether ApproximateDeterminant has found the eigenvalue you wished to compute or whether
the iterations have converged to a completely different solution.
Tolerance uses a logarithmic measure for distances. For example, Tolerance −> 1.0 allows the
value of the solution Λ to lie within and times the value of the initial guess theta0.
Examples
Load Analog Insydes.
Define an AC model for
BJTs.
This netlist describes a
common-emitter amplifier.
In[1]:= AC,
Scope −> Global,
Ports −> {B, C, E},
Parameters −> {Rbe, Cbc, Cbe, beta, Ro,
RBE, CBC, CBE, BETA, RO},
Definition −> Netlist[
{CBE, {B, E}, Symbolic −> Cbe, Value −> CBE},
{RBE, {X, E}, Symbolic −> Rbe, Value −> RBE},
{CBC, {B, C}, Symbolic −> Cbc, Value −> CBC},
{CC, {B, X, C, E},
Symbolic −> beta, Value −> BETA},
{RO, {C, E}, Symbolic −> Ro, Value −> RO}
]
]
] // ExpandSubcircuits;
In[3]:= ceamplifier =
Circuit[
Netlist[
{V1, {1, 0}, 1},
{V0, {6, 0}, 0},
{C1, {1, 2}, Symbolic −> C1, Value −> 1.0*^−7},
{R1, {2, 6}, Symbolic −> R1, Value −> 1.0*^5},
{R2, {2, 0}, Symbolic −> R2, Value −> 47000.},
{RC, {6, 3}, Symbolic −> RC, Value −> 2200.},
{RE, {4, 0}, Symbolic −> RE, Value −> 1000.},
{C2, {3, 5}, Symbolic −> C2, Value −> 1.0*^−6},
{RL, {5, 0}, Symbolic −> RL, Value −> 47000.},
{Q1, {2 −> B, 3 −> C, 4 −> E},
Model −> BJT, Selector −> AC,
CBE −> 30.*^−12, CBC −> 5.*^−12, RBE −> 1000.,
RO −> 10000., BETA −> 200.}
]
]
Out[3]= Circuit