Symbolic nodal analysis of fully-differential analog circuits

In this paper, a simple element stamp for floating or grounded voltage-controlled voltage sources is proposed. The novelty is that not only the behavior of single-ended, fully-differential and balanced differential operational amplifiers can directly be introduced in the admittance matrix without ex...

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Bibliographic Details
Published in2013 IEEE 4th Latin American Symposium on Circuits and Systems (LASCAS) pp. 1 - 4
Main Authors Sanchez-Lopez, C., Ochoa-Montiel, R., Ruiz-Pastor, A., Gonzalez-Contreras, B. M.
Format Conference Proceeding
LanguageEnglish
Published IEEE 01.02.2013
Subjects
Admittance
Analog circuits
commoun-mode rejection ratio
controlled sources
Equations
Equivalent circuits
Integrated circuit modeling
Mathematical model
Memory management
Nodal analysis
nullor
operational amplifier
symbolic analysis
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Summary:In this paper, a simple element stamp for floating or grounded voltage-controlled voltage sources is proposed. The novelty is that not only the behavior of single-ended, fully-differential and balanced differential operational amplifiers can directly be introduced in the admittance matrix without extra variables, but also the new stamp has few nonzero elements. As a consequence, a reduced and sparse system of equations is built, which means that the computational complexity and memory consumption during the solution of the system of equations by using recursive determinant-expansion techniques are both enhanced. Three analysis examples are used to show that fully-symbolic transfer functions of single-ended, fully-differential and balanced differential analog circuits can be computed by using standard nodal analysis. Furthermore, symbolic expressions for the common-mode rejection ratio of the fully-differential amplifiers are also computed.
ISBN:146734897X
9781467348973
DOI:10.1109/LASCAS.2013.6519009