Referenced Items are not available for this document.
In this paper, a study of the operation of switched continuous-time filters (SCTFs), defined as continuous-time filters with elements that are alternatively switched on and off in the signal path, is conducted. A well-known example is the use of switched resistors to multiply their value, but the universe of applications is wider. First, a detailed calculation of the output of an SCTF in the frequency domain, which allows the examination of any SCTF in a general framework, is presented. This result particularly explains the resistor multiplication effect. Three application examples using switched elements are presented and examined as SCTFs: a nonideal sample & hold, a switched active filter that is tuned by varying the duty cycle of the switching, and a switched Gm-C filter to implement a chopper amplifier. In all cases, the theoretical background allows the examination of circuit behavior and limitations, and the analysis is supported by measurements or transient simulations.
Published in:
Circuits and Systems I: Regular Papers, IEEE Transactions on
(Volume:55
,
Issue:
6
)
Date of Publication: July 2008
- Page(s):
- 1421 - 1429
- ISSN :
- 1549-8328
- INSPEC Accession Number:
- 10117086
- Digital Object Identifier :
- 10.1109/TCSI.2008.917999
- Product Type:
- Journals & Magazines
- Date of Publication :
- 07 February 2008
- Date of Current Version :
- 15 July 2008
- Issue Date :
- July 2008
- Sponsored by :
- IEEE Circuits and Systems Society
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