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Application Notes

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  Unique Applications for the LTC1062 Lowpass Filter &mdash AN24
  PDF, 587 Кб, Файл опубликован: 1 сен 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 Кб, Файл опубликован: 23 июн 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.
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  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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  Take the Mystery Out of the Switched Capacitor Filter &mdash AN40
  PDF, 3.0 Мб, Файл опубликован: 1 мар 1990
  This note presents guidelines for circuits utilizing LTC's switched capacitor filters. The discussion focuses on how to optimize filter performance by optimizing the printed wiring board, the power supply, and the output buffering of the filter. Many additional topics are discussed such as how to select the proper filter response for the application and how to characterize a filter's THD for DSP applications.
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  Application Note 40
  March 1990
  Take the Mystery Out of the Switched-Capacitor Filter:
  The System Designer’s Filter Compendium
  Richard Markell
  INTRODUCTION
  Overview
  This Application Note presents guidelines for circuits utilizing Linear Technology’s switched-capacitor filter family.
  Although the switched-capacitor filter has been designed
  into “telecom” circuits for over 20 years, the newer devices are faster, quieter and lower in distortion. These
  filters now achieve total harmonic distortion (THD) below
  –76dB (LTC®1064-2), wideband noise below 55μVRMS
  (LTC1064-3), high frequency of operation (LTC1064-2,
  LTC1064-3 and LTC1064-4 to 100kHz) and steep roll-offs
  from passband to stopband (LTC1064-1: –72dB at 1.5 ×
  fCUTOFF). These specifications make the new generation of
  switched-capacitor filters from LTC candidates to replace
  all but the most esoteric of active RC filter designs.
  Application Note 40 takes the mystery from the design of
  high performance active filters using switched-capacitor
  filter integrated circuits. To help the designer get the highest performance available, this Note covers most of the
  problems prevalent in system level switched-capacitor
  filter design. The Note covers both tutorial filter material …

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