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FilterLab®2.0 User’s Guide

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  • 日期: 2018-03-26
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标签: Filterlab

Filterlab

源滤波器

源滤波器

滤波器电路

滤波电路常用于滤去整流输出电压中的纹波,一般由电抗元件组成,如在负载电阻两端并联电容器C,或与负载串联电感器L,以及由电容,电感组成而成的各种复式滤波电路。

FilterLab®  2.0  is  an  innovative  software  tool  that  simplifies  active  filter  design。Available  at  no  cost  from  Microchip’s  web  site  (www.microchip.com),  the  FilterLab  2.0  active  filter  software  design  tool  provides  full  schematic  diagrams  of  the  filter  circuit  with  recommended  component  values  and  displays  the  frequency  response。

M FilterLab®2.0 User’s Guide  2003 Microchip Technology Inc. DS51419A Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • • • • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip's Data Sheets. Most likely, the person doing so is engaged in theft of intellectual property. Microchip is willing to work with the customer who is concerned about the integrity of their code. Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not mean that we are guaranteeing the product as “unbreakable.” Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our products. Attempts to break microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act. Information contained in this publication regarding device applications and the like is intended through suggestion only and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. No representation or warranty is given and no liability is assumed by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Use of Microchip’s products as critical components in life support systems is not authorized except with express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property rights. Trademarks The Microchip name and logo, the Microchip logo, Accuron, dsPIC, KEELOQ, MPLAB, PIC, PICmicro, PICSTART, PRO MATE and PowerSmart are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. AmpLab, FilterLab, microID, MXDEV, MXLAB, PICMASTER, SEEVAL and The Embedded Control Solutions Company are registered trademarks of Microchip Technology Incorporated in the U.S.A. Application Maestro, dsPICDEM, dsPICDEM.net, ECAN, ECONOMONITOR, FanSense, FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP, ICEPIC, microPort, Migratable Memory, MPASM, MPLIB, MPLINK, MPSIM, PICkit, PICDEM, PICDEM.net, PowerCal, PowerInfo, PowerMate, PowerTool, rfPIC, Select Mode, SmartSensor, SmartShunt, SmartTel and Total Endurance are trademarks of Microchip Technology Incorporated in the U.S.A. and other countries. Serialized Quick Turn Programming (SQTP) is a service mark of Microchip Technology Incorporated in the U.S.A. All other trademarks mentioned herein are property of their respective companies. © 2003, Microchip Technology Incorporated, Printed in the U.S.A., All Rights Reserved. rfLAB, Printed on recycled paper. Microchip received QS-9000 quality system certification for its worldwide headquarters, design and wafer fabrication facilities in Chandler and Tempe, Arizona in July 1999 and Mountain View, California in March 2002. The Company’s quality system processes and procedures are QS-9000 compliant for its PICmicro® 8-bit MCUs, KEELOQ® code hopping devices, Serial EEPROMs, microperipherals, non-volatile memory and analog products. In addition, Microchip’s quality system for the design and manufacture of development systems is ISO 9001 certified. DS51419A-page ii  2003 Microchip Technology Inc. M FilterLab® 2.0 User’s Guide Table of Contents General Information Introduction .......................................................................................... 1 About This Guide ................................................................................. 2 The Microchip Internet Web Site.......................................................... 2 Customer Support ................................................................................ 3 Chapter 1. Dialog Boxes 1.1 Dialog Boxes ................................................................................ 5 Chapter 2. Wizards 2.1 Anti-Aliasing Wizard ................................................................... 19 2.2 Filter Selection Wizard ............................................................... 25 Chapter 3. Toolbar 3.1 Buttons ....................................................................................... 35 3.2 Approximation Combo Box ........................................................ 38 3.3 Frequency Textboxes ................................................................. 39 Chapter 4. Menus 4.1 File ............................................................................................. 41 4.2 Edit ............................................................................................. 44 4.3 View ........................................................................................... 45 4.4 Filter ........................................................................................... 46 4.5 Window ...................................................................................... 47 4.6 Help ............................................................................................ 47  2003 Microchip Technology Inc. DS51419A-page iii FilterLab® 2.0 User’s Guide Chapter 5. Window Views 5.1 Frequency View ..........................................................................49 5.2 Circuit View .................................................................................50 5.3 Spice Listing View ......................................................................51 Appendix A. FilterLab 2.0 to SPICE Interface A.1 Introduction And Highlights......................................................... 53 Appendix B. Filter Magnitude Templates B.1 Introduction................................................................................. 57 Appendix C. Group Delay C.1 Introduction................................................................................. 63 Appendix D. Bessel Filter Response D.1 Introduction................................................................................. 65 Appendix E. Op Amp Selection E.1 Introduction................................................................................. 67 Appendix F. Selected References F.1 Introduction................................................................................. 71 Worldwide Sales and Service ................................................................. 72 DS51419A-page iv  2003 Microchip Technology Inc. M FilterLab® 2.0 User’s Guide General Information INTRODUCTION FilterLab® 2.0 is an innovative software tool that simplifies active filter design. Available at no cost from Microchip’s web site (www.microchip.com), the FilterLab 2.0 active filter software design tool provides full schematic diagrams of the filter circuit with recommended component values and displays the frequency response. FilterLab 2.0 allows the design of low-pass filters up to an 8th order filter with Cheby- chev, Bessel or Butterworth responses from frequencies of 0.1 Hz to 1 MHz. FilterLab 2.0 also can be used to design band-pass and high-pass filters with Chebychev and Butterworth responses. The circuit topologies supported by FilterLab 2.0 are the Sallen Key and Multiple Feedback (MFB). The low-pass filters can use either the Sallen Key or MFB, the band-pass is available with the MFB and the high-pass uses the Sallen Key. Users can select a flat pass band or sharp transition from pass band to stopand. Options (such as minimum ripple factor, sharp transition and linear phase delay) are available. Once the filter response has been identified, FilterLab 2.0 generates the fre- quency response and the circuit. For maximum design flexibility, changes in capacitor values can be implemented to fit the demands of the application. FilterLab 2.0 will recalculate all values to meet the desired response, allowing real-world values to be substituted or changed as part of the design process. FilterLab 2.0 also generates a SPICE model of the designed filter. Extraction of this model will allow time domain analysis in SPICE simulations, streamlining the design process. Further consideration is given to designs used in conjuction with an Analog-to-Digital Converter (ADC). A suggested filter can be generated by simply inputting the bit resolution and sample rate via the Anti-Aliasing Wizard. This eliminates erroneous signals folded back into the digital data due to the aliasing effect. This section also covers the following topics: • About This Guide • The Microchip Internet Web Site • Customer Support  2003 Microchip Technology Inc. DS51419A-page 1
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