Flash Menu

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! »

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 and offers all the features of Filter Free plus:
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

Filter Solutions supports the following desirable features:

General:

• 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
• S and Z Transforms in Standard, Cascade, and Parallel Forms
• Stand Alone or Floating Network Licensing Available
• Asymmetrical Band Pass Filter, Including Parametric Butterworth Filters
• Time Analysis of User Entered Data
• Constricted Pass Band Ripple for Improved Chebyshev I and Elliptic Filter Performance
• Extensive HELP Section To Support Your Filter Design Effort
• Custom Designed Filters From User Entered S and Z Transforms
• Manual Pole/Zero User Manipulation to Easily Adjust Your Filter Design
• All Pass Additions
• 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 Update Features to Aid in Delay Equalization and Other Design Requirements.
• Smith charts and Jones charts, and polar plots.

Passive LC Filters:

• 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
• Finite Q Analysis for All Filters.
• Finite Q Compensation for Single and Unequally Terminated Filters.
• Amplitude Equalization for Equally and Unequally Terminated filters.
• Diplexers and Triplexers.
• Coupled Resonator Band Pass Filters.
• Tubular Band Pass Filters.
• Minimum Inductor Zigzag filters.
• 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.
• Automatic Inductor and Capacitor Tuning.
• Complex Termination Synthesis.
• 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
• Cross Coupled Resonator Chebyshev I and Elliptic Narrow Band Pass Filters.

  Transmission Line Filters:

• 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.
• Nonzero Resistance and Conductance Analysis for All Filters.
• Diplexers For all Double Terminated Designs With and Without Reflection Compensation.
• Low Pass/High Pass and Band Pass/Band Stop Diplexers.
• Finite Length Transmission Lines Between Stubs Analysis for All Filters.
• Coupled Resonator Band Pass Filters.
• Easily Change Single Stub Resonators to Dual Stub
and Dual Stub to Single Stub.
• Means to Easily Modify, Add, or Delete Elements and Stubs.
• Create Composite Filters Composed of Lumped Elements and Transmission Line Stubs.
• Insert Transmission Line segments Between Filter Stubs and Elements.
• Random Value Updates for filter elements for Monte Carlo analysis.
• Complex Termination synthesis.
• Stripline and Micropstrip Implementations and Analysis, Including Conductor and Dielectric Losses.
• Coupled Stripline and Microstrip Band Pass and High Pass Filters, including Resonator Filters.
• Hairpin, Interdigital, and Combline Filters, both Tapped and Untapped, and in both Microstrips and Striplines.

Digital Filters:

• 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.
• 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 2007, and Filter Free 2007 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.