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Application Notes

• Download
  Unique Applications for the LTC1062 Lowpass Filter &mdash AN24
  PDF, 587 Kb, File published: Sep 1, 1987
  Highlights the LTC1062 as a lowpass filter in a phase lock loop. Describes how the loop's bandwidth can be increased and the VCO output jitter reduced when the LTC1062 is the loop filter. Compares it with a passive RC loop filter. Also discussed is the use of LTC1062 as simple bandpass and bandstop filter.
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  A Simple Method of Designing Order All Pole Bandpass Filters by Cascading 2nd Order Sections &mdash AN27A
  PDF, 245 Kb, File published: Jun 23, 1988
  Presents two methods of designing high quality switched capacitor bandpass filters. Both methods are intended to vastly simplify the mathematics involved in filter design by using tabular methods. The text assumed no filter design experience but allows high quality filters to be implemented by techniques not presented before in the literature. The designs are implemented by numerous examples using devices from LTC's Switched- Capacitor filter family: LTC1060, LTC1061, and LTC1064. Butterworth and Chebyshev bandpass filters are discussed.
  Extract from the document

  Application Note 27A
  June 1988
  A Simple Method of Designing Multiple Order All Pole
  Bandpass Filters by Cascading 2nd Order Sections
  Nello Sevastopoulos
  Richard Markell
  INTRODUCTION DESIGNING BANDPASS FILTERS Filter design, be it active, passive, or switched capacitor,
  is traditionally a mathematically intensive pursuit. There
  are many architectures and design methods to choose
  from. Two methods of high order bandpass filter design
  are discussed herein. These methods allow the filter
  designer to simplify the mathematical design process
  and allow LTC’s switched capacitor filters (LTC®1059,
  LTC1060, LTC1061,LTC1064) to be utilized as high quality
  bandpass filters. Table 1 was developed to enable anyone to design Butterworth bandpass filters. We will discuss the tables in
  more detail later in this paper, but let’s first design a filter. AN27A is the first of a series of application notes from
  LTC concerning our universal filter family. Additional notes
  in the series will discuss notch, lowpass and highpass
  filters implemented with the universal switched capacitor
  filter. An addition to this note will extend the treatment of
  bandpass filters to the elliptic or Cauer forms.
  This note will first present a finished design example and
  proceed to present the design methodology, which relies on …

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Manufacturer's Classification

• Signal Conditioning > Filters > Filter Building Blocks

Other Names:

LTC1059CNPBF, LTC1059CN PBF