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+ANALYSES
+========
+
+This file lists the analyses currently implemented into ngspice.
+
+Table of Contents
+
+ 1 Noise analysis (NOISE)
+   1.1 Small signal noise
+   1.2 Transient noise
+ 2 Operating point analysis (OP)
+ 3 Operating point sweep Analysis (DC)
+ 4 Pole-zero analysis (PZ)
+ 5 Small-Signal distortion analysis (DISTO)
+ 6 Small Signal frequency response analysis (AC)
+ 7 Sensitivity analysis (SENS)
+ 8 Transfer function analysis (TF)
+ 9 Transient analysis (TRAN)
+ 10 Periodic steady state analysis (PSS, experimental feature)
+
+
+
+1 Noise analysis (NOISE)
+
+ 1.1 Small signal noise
+
+    The noise analysis does analysis device-generated noise for the given
+ circuit. When provided with an input source and an output port, the analysis
+ calculates the noise contributions of each device (and each noise generator
+ within the device) to the output port voltage. It also calculates the input
+ noise to the circuit, equivalent to the output noise referred to the
+ specified input source. This is done for every frequency point in a specified
+ range - the calculated value of the noise corresponds to the spectral density
+ of the circuit variable viewed as a stationary gaussian stochastic process.
+
+ 1.2 Transient noise
+
+    Time domain noise analysis during transient simulation is enabled by
+ providing voltage (and current) source options with white, 1/f and
+ random telegraph signal noise signals.
+
+
+2 Operating point analysis (OP)
+
+    The operating point analysis determines the dc operating point of the
+ circuit with inductors shorted and capacitors opened.
+
+
+3 Operating point sweep Analysis (DC)
+
+    The operating point sweep analysis determines the values of output
+ variables while one or two specified independent voltage or current source is
+ stepped over a user-specified range and the dc output variables are stored
+ for each sequential source value. Resistance and temperature sweep are
+ included.
+
+
+4 Pole-zero analysis (PZ)
+
+    The pole-zero analysis computes the poles and/or zeros in the small-signal
+ ac transfer function. The program first computes the dc operating point and
+ then determines the linearized, small-signal models for all the nonlinear
+ devices in the circuit. This circuit is then used to find the poles and zeros
+ of the transfer function. Unfortunately this code is (since its inception in
+ spice3) not free of bugs.
+
+
+5 Small-Signal distortion analysis (DISTO)
+
+    The distortion analysis computes steady-state harmonic and intermodulation
+ products for small input signal magnitudes. Not all devices are supported.
+
+
+6 Small Signal frequency response analysis (AC)
+
+    The ac small-signal computes the ac output variables as a function of
+ frequency. The program first computes the dc operating point of the circuit
+ and determines linearized, small-signal models for all of the nonlinear
+ devices in the circuit. The resultant linear circuit is then analyzed over a
+ user-specified range of frequencies.
+
+
+7 Sensitivity analysis (SENS)
+
+    Ngspice will calculate either the DC operating-point sensitivity or the AC
+ small-signal sensitivity of an output variable with respect to all circuit
+ variables, including model parameters. Spice calculates the difference in an
+ output variable (either a node voltage or a branch current) by perturbing
+ each parameter of each device independently.
+
+
+8 Transfer function analysis (TF)
+
+    The (small signal) transfer function analysis computes the dc small-signal
+ value of a transfer function (ratio of output variable to input source),
+ input resistance, and output resistance is also computed as a part of the dc
+ solution.
+
+
+9 Transient analysis (TRAN)
+
+    The transient analysis computes the transient output variables as a
+ function of time over a user-specified time interval. The initial conditions
+ are automatically determined by a dc analysis. All sources which are not time
+ dependent (for example, power supplies) are set to their dc value.
+
+
+10 Periodic steady state analysis (PSS)
+
+    The periodic steady state analysis computes solutions for oscillating
+ circuits. Currently only the autonomous case is implemented.
+
+