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Welcome to Filter Solutions Filter Light and Filter Free! Products of Nuhertz Technologies, LLC Filter Design At Its Best Filter Solutions Passive and Tx Line Features Are Now Integrated With AWR's Microwave Office under the name Nuhertz Filter and Sold by AWR Find a Nuhertz Sales Representative             Find an AWR Sales Representative Free Trial: Register here for free trial! »

*** Filter Solutions 2008 Just Released With Off-Axis Quadruplet Zeros for More Efficient  Low Pass, High Pass, and Band Pass Delay Equalization. ***

The new fourth edition of Electronic Filter Design Handbook illustrates Elliptic filter design with Filter Solutions.
Author Arthur Williams does an excellent job making Elliptic filter design easy.

Filter Solutions, Filter Light, and Filter Free are comprehensive PC windows based filter synthesis and analysis software packages for passive, transmission line, active, switched capacitor, and digital filters. Filter Free is the freeware version with minimal functionality. Filter Light is the low cost version with expanded capabilities over Filter Free, and Filter Solutions is the fully functional version. 

Filter Light is the low cost version of Filter Solutions.
Filter Solutions supports tall of the features of Filter Light plus many advanced features.

Filter Light and Filter Solutions support the following desirable features:

General:

Filter Light and Filter Solutions:

• Gaussian, Bessel, Butterworth, Legendre, Chebyshev Type I, Chebyshev Type II, Hourglass, Elliptic, Raised Cosine, Matched and Delay filters.
• Low Pass, High Pass, Band Pass, Band Stop and Asymmetrical Band Pass.
• Real Time Feedback on Filter Modification Analysis.
• S and Z Transforms in Vector Format to Easily Interface With Matlab and Matrix-x.
• Displays Transfer Functions, Pole/Zero Plots, Time Response, Frequency Response, and Reflection Coefficient of Ideal Filter Designs.
• Stand Alone or Floating Network Licensing Available.
• Asymmetrical Band Pass Filter, Including Parametric Butterworth Filters.
• Time Analysis of User Entered Data.
• High order filters: 20 for passive and IIR filters, 10,000 for digital FIR filters, 200 for switched capacitor FIR filters.
• Element modification capability for passive, transmission, and active filters.
• Frequency, impedance, and time analysis for modified passive, transmission, and active filters.
• Transfer functions for modified passive, active, and switched capacitor filters.
• Reflection analysis for modified passive filters.
• Cascade and parallel forms for S and Z transforms.
• Stop Band and Off-axis real zeros Placement for Butterworth and Chebyshev I Filters.
• Extensive HELP Section To Support Your Filter Design Effort.

Filter Solutions Only:

• Custom Designed Filters From User Entered S and Z Transforms.
• Constricted Pass Band Ripple for Improved Chebyshev I and Elliptic Filter Performance.
• Custom Designed Filters From User Entered S and Z Transforms.
• Manual Pole/Zero User Manipulation to Easily Adjust Your Filter Design.
• Manual Delay Equalization For All Analog and IIR Filters.
• Automatic Delay Equalization for Low Pass and Band Pass Analog and IIR Filters.
• Real Time Design Updates From Pole/Zero Plot Changes to Aid in Delay Equalization and Other Design Requirements.
• Smith Charts and Jones charts, and Polar Plots.  (Smith and Jones charts supported in Passive and Tx Line implementations only).
• Off-Axis Quadruplet Zero Placement for More Efficient Low Pass, High Pass, and Band Pass Delay Equalization.  (Passive, Active, Sw Cap, and Digital Implementations only).
• Maintain Up to Three Standard Parts Lists and Automatically Select the Nearest Standard Part For Each Element.

Passive LC Filters:

Filter Light and Filter Solutions:

• LC Circuit Synthesis for Single Terminated, Unequally Terminated, and Equally Terminated Filters.
• Balanced and Unbalanced Filters
• Easy to Read Graphical Circuit Displays
• Export Transfer Functions of Modified Filters.
• Analysis of User Modified LC Circuits Including Time Response, Frequency Response, Input/Output Reflection Coefficient, Input/Output Impedance, and Transfer Functions.
• Textual Net Lists That Are Ready to Execute in Applications That Support Net Lists

Filter Solutions Only:

• Finite Q Analysis for All Filters.
• Finite Q Compensation for Single and Unequally Terminated Filters.
• Amplitude Equalization for Equally and Unequally Terminated filters.
• Diplexers, Triplexers, and Band Pass Diplexers with Reflection Compensation.
• Coupled Resonator Band Pass Filters.
• Tubular Band Pass Filters.
• Cross Coupled Resonator Chebyshev I and Elliptic Narrow Band Pass Filters with Minimum Possible Number of Couplings.
• Minimum Inductor Zigzag Filters, Including Odd Order, to Minimize Inductor Count.
• All Pass Sections, both Balanced and Unbalanced, to Support Delay Equalizers.
• Means to Easily Modify, Add, or Delete Elements Including Resistors, Capacitors, Inductors, LC pairs, and All Pass Sections.
• Maintain Up to Three Standard Parts Lists and Automatically Select the Nearest Standard Part For Each Element.
• Automatically Update Parts to the Nearest 1% or 5% Standard Industrial Part.
• Random Value Updates for filter Elements for Monte Carlo Analysis.
• Detailed Component Sensitivity Analysis, Including Sensitivity Tables and Plots.
• Automatic Inductor and Capacitor Tuning.
• Optimizations for Complex Terminations.
• General Norton, PI->T, and T->PI Conversions.
• Parasitic Node Capacitance Compensation for Elliptic, Hourglass, and Chebyshev II Band Pass Filters.
• Equal Inductor Band Pass Filters.
• Band Pass Filters Implemented from Cascaded High and Low Pass Sections
• Monte Carlo analysis and Component Sensitivity Analysis and Plots.

Transmission Line Filters:

Filter Light and Filter Solutions:

• Transmission Line Filter Synthesis for Single Terminated, Unequally Terminated, and Equally Terminated Filters.
• Balanced and Unbalanced Filters.
• User Selectable Length Units of Meters, Feet, and Inches.
• Easy to Read Graphical Circuit Displays.
• Textual Net Lists That Are Ready to Execute in Applications That Support Net Lists.
• Analysis of User Modified Transmission Line Circuits Including Time Response, Frequency Response, Input/Output Reflection Coefficient, Input/Output Input Impedance, and Transfer Functions.
• Single Stub and Dual Stub Resonators.
• Textual Net Lists That Are Ready to Execute in Applications That Support Net Lists.

Filter Solutions Only:

• Micro Strip and Strip Line Geometries.
• Parallel Edge Coupled Resonator, and Shunt Stub Resonator Band Pass Filters, in Both Micro Strips and Strip Lines.
• Hairpin, Interdigital, and Combline Filters, both Tapped and Untapped, in Both Micro Strips and Strip Lines.
• Parasitic Resistance and Conductance Analysis.
• Diplexers.
• Easily Change Single Stub Resonators to Dual Stub
and Dual Stub to Single Stub.
• Composite Filters Composed of Lumped Elements and Transmission Line Stubs.
• Random Value Updates for filter Elements for Monte Carlo Analysis for Stub/Segment Filters.

Digital Filters:

Filter Light and Filter Solutions:

• Digital Transformations of Bilinear, Z Matched, Impulse Invariant, and Step Invariant.
• FIR Window Filters of Rectangular, Bartlett, Hanning, Hamming, Blackman, Blackman-Harris, Kaiser, and Dolph-Chebyshev.
• FIR Iterative Remez.
• FIR Communications Filters of Raised Cosine, Root Raised Cosine, Cosine, Sine, and Matched.
• FIR Arithmetically Symmetric Band Pass Raised Cosine and Root Raised Cosine.
• FIR Approximations of all Supported Analog Filters.
• FIR arithmetically symmetric raised cosine and root raised cosine filters.
• Z Transforms in Vector Format to Easily Interface With Matlab and Matrix-x.
• Z Transforms in Standard, Cascade, and Parallel Forms.

Filter Solutions Only:

• Finite Precision Error Analysis of Digital Filters Including Effects on Frequency Traces, Time Traces, and Pole/Zero Movements.
• Automatic C code Generation of Digital Filters With User Specified Precision and Form.
• Sin(x)/x Sampling Correction With First, Second, or Third Order Approximation Options.
• Z Transform Outputs and Finite Precision Analysis in Decimal, Signed and Unsigned Floating Point, and Signed and Unsigned Fixed Point.

Filter Free is the free version of Filter Solutions. Functionality is limited 3rd order analog and IIR filters, and 10 tap FIR filters. Filters are synthesized. Frequency, time, and reflection analysis are performed on the ideal functions only. Transfer functions are displayed in standard form only.

Filter Solutions 2008, Filter Light 2008 and Filter Free 2008 are available from our Download site.   Trial periods for Filter Solutions may be requested from Nuhertz.   Filter Free is free.

You may purchase a license from Nuhertz Technologies, LLC at any time if you wish to continue to use Filter Solutions beyond the trial period.