Publication detail

AC analysis of switched capacitor filters in SPICE-family programs

BIOLEK, D. BIOLKOVÁ, V. KOLKA, Z.

Original Title

AC analysis of switched capacitor filters in SPICE-family programs

English Title

AC analysis of switched capacitor filters in SPICE-family programs

Type

conference paper

Language

en

Original Abstract

The paper describes a method for the analysis of the frequency characteristics of switched-capacitor circuits in SPICE-family programs, which do not provide a direct AC analysis of such networks. The method starts from the z-domain charge equations of switched circuit, which are modified to current equations. Based on these equations, macromodels of capacitor and operational amplifier are constructed and implemented as SPICE subcircuits. The method generates correct results for two-phase switched circuits containing ideal switches and ideal transforming cells such as operational amplifiers. For a convenient drawing of the model via schematic editor, special schematic symbols of the components are designed such that the user can define how the nodes are interconnected by switches during each switching phase, and also select the input and output samples for a definition of the corresponding frequency characteristics.

English abstract

The paper describes a method for the analysis of the frequency characteristics of switched-capacitor circuits in SPICE-family programs, which do not provide a direct AC analysis of such networks. The method starts from the z-domain charge equations of switched circuit, which are modified to current equations. Based on these equations, macromodels of capacitor and operational amplifier are constructed and implemented as SPICE subcircuits. The method generates correct results for two-phase switched circuits containing ideal switches and ideal transforming cells such as operational amplifiers. For a convenient drawing of the model via schematic editor, special schematic symbols of the components are designed such that the user can define how the nodes are interconnected by switches during each switching phase, and also select the input and output samples for a definition of the corresponding frequency characteristics.

Keywords

Switched capacitor; SC; AC analysis; frequency characteristic; SPICE

RIV year

2015

Released

14.10.2015

Publisher

AOS L. Mikuláš

Location

L. Mikuláš, Slovensko

ISBN

978-80-8040-508-3

Book

Proceedings of the KIT 2015

Pages from

1

Pages to

6

Pages count

6

BibTex


@inproceedings{BUT118257,
  author="Dalibor {Biolek} and Viera {Biolková} and Zdeněk {Kolka}",
  title="AC analysis of switched capacitor filters in SPICE-family programs",
  annote="The paper describes a method for the analysis of the frequency characteristics of switched-capacitor circuits in SPICE-family programs, which do not provide a direct AC analysis of such networks. The method starts from the z-domain charge equations of switched circuit, which are modified to current equations. Based on these equations, macromodels of capacitor and operational amplifier are constructed and implemented as SPICE subcircuits. The method generates correct results for two-phase switched circuits containing ideal switches and ideal transforming cells such as operational amplifiers. For a convenient drawing of the model via schematic editor, special schematic symbols of the components are designed such that the user can define how the nodes are interconnected by switches during each switching phase, and also select the input and output samples for a definition of the corresponding frequency characteristics.",
  address="AOS L. Mikuláš",
  booktitle="Proceedings of the KIT 2015",
  chapter="118257",
  howpublished="electronic, physical medium",
  institution="AOS L. Mikuláš",
  year="2015",
  month="october",
  pages="1--6",
  publisher="AOS L. Mikuláš",
  type="conference paper"
}