Overview
AFS oscillator
noise analysis (oscnoise/vconoise) computes the phase noise of periodic
autonomous circuits such as VCOs (LC-tank and ring-oscillator circuits)
and crystal oscillators. AFS
oscillator noise analysis is faster than
transient noise analysis for this type of circuit and, like periodic
noise analysis, can provide noise source contributions.
In
driven circuits, the period is known. However, when applied to
oscillators, PSS analysis needs to compute the oscillation period as
well.
For VCOs, AFS RF offers two types of PSS analyses. The first, oscpss,
determines
the period and steady-state waveforms
given the VCO control voltage. The second, vcopss, determines
the
VCO control voltage given the oscillation
frequency.
Benefits
- Always
nanometer SPICE accuracy
- Full
stochastic nonlinear analysis
- Periodic steady state (PSS) with
>100K-element capacity
- Contribution
for every noise source
- Impulse
sensitivity function for every
node
- Capacity
to handle post-layout circuits
- Always
full Spectrum - no need to specify
maxsideband
Target
Applications
- >1
GHz,
nanometer-scale, post-layout CMOS circuits
- VCOs
(ring-oscillator, LC-tank) including bias and amplifier
- Highly
nonlinear and high-Q crystal oscillators with limiters
PSS with >100K-Element Capacity
AFS RF periodic
steady-state (PSS) analysis is an efficient time-domain method
that uses the shooting method to calculate one steady-state period
accurately. AFS RF Analysis
has
superior PSS
convergence that easily handles
circuits that are far too complex for any other tool – up to
100,000 elements.
AFS oscillator
noise analysis (oscnoise and vconoise) provides superior results for
complex VCOs and crystal oscillators. It is the only such analysis in
the industry that is based on a full stochastic nonlinear analysis
without approximations. Hence AFS RF
delivers nanometer SPICE accuracy for
every run. In addition to providing contribution information for every
run, AFS RF also uniquely
provides Impulse Sensitivity Function (ISF)
information for every node and every run – automatically, with no
user interaction or simulation overhead.
Oscillator
Impulse Sensitivity Function
AFS RF
Specifications
AFS RF
Analysis uses industry-standard netlists and models and is fully
integrated into the leading EDA design environment. It produces
standard output file formats and includes sophisticated post-processing
and analysis capabilities.
- Analyses:
- Periodic
analyses: OSCPSS, VCOPSS, oscnoise, vconoise
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