F. Leyn, G. Gielen, and W. Sansen,
Analog Small-Signal Modeling--Part I: Behavioral Signal Path Modeling
for Analog Integrated Circuits.
IEEE Transactions on Circuits and Systems II: Analog and digital
signal processing,
ISSN 1057-7130,
48(7), pp. 701-711,
July 2001.
This paper describes the transformation of
small-signal modeling of analog integrated circuits into control
system modeling. Transforming a small-signal circuit into a
control system equivalent results in a behavioral signal path (BSP)
model. A BSP model gives insight in the operation of a circuit
because it shows all the different conversions from current to
voltage and vice versa, including poles and zeros which cause a
decrease-increase in transfer along the signal path. The different
poles are a function of the small-signal parameters of the different
devices and are modeled with small symbolic equations, which
make them fully comprehensible. This enables the designer
to accurately control the sizing process by enabling pole/zero
placement. On a BSP model, all theorems of control theory as
well as typical design approximations can be performed. The
methodology and its applications are illustrated with several
examples.