Linearizer DesignGuide

The Linearizer DesignGuide contains many templates that can assist developers in designing a linearizer to meet performance specifications for non-linear circuits. This DesignGuide provides a complete tool kit to interactively explore dynamic linearization systems at the top level as part of an integrated design process.

ONLINE DEMO

ADS Linearizer DesignGuide To see a step-by step demo of the Linearizer DesignGuide in Advanced Design System (ADS), click on the following link: ADS Linearizer DesignGuide Complete Online Product Demos

Linearizer DesignGuide illustrates the following Linearization techniques: Feedforward, LINC, Cartesian Feedback and Digital Predistortion.

Linearizer DesignGuide Capability

The schematics in Linearizer DesignGuide help demonstrate the performance that can be achieved through linearization. User-defined subcircuits can replace the individual components such as the couplers, auxiliary amplifier, combiners, and complex correlators. Parameters including the operating frequency and power level are user definable. The linearization techniques generally consist of steps should be followed to better understand the design procedure and ultimately realize an optimized linearized power amplifier. The steps are also used to demonstrate sensitivity and adaptation techniques.

For Digital Predistortion, schematics and menu-driven coefficient data file management functions are provided to linearize an actual hardware power amplifier. In this mode, ADS is connected to and operates an ESG signal generator and a Vector Signal Analyzer to implement a full closed-loop adaptive digital predistortion linearizer.

Complete Linearization Capability

• Digital Predistortion of Hardware using Connected ESG and VSA
  
• FeedForward eight-step design process.
  
• FeedForward IS-95 CDMA, pi/4 DQPSK, 16 QAM and CDMA 2000.
  
• Reverse Link.
  
• RF Predistortion six-step design process.
  
• RF Predistortion IS-95 CDMA and pi/4 DQPSK, 16 QAM.
  
• Combined FeedForward and PreDistortion ten-step design process.
  
• LINC design five-step design process.
  
• LINC design pi/4 DQPSK, IS-95 CDMA and 16 QAM simulation.
  
• Analog PreDistortion cubic law three-step design process.
  
• Analog PreDistortion square law three-step design process.
  
• Cartesian feedback pi/4 DQPSK, IS-95 CDMA and 16 QAM simulation.
  
• Digital PreDistortion six-step design process.
  
• Digital PreDistortion CMDA 2000 Reverse Link, IS-95 CDMA, pi/4.
  
• DQPSK and 16 QAM.
  
• Short Time/ Long Time Constant Memory Effects.
  
• ACPR optimization technique.
  
• Gradient optimization technique.
  

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Linearization DesignGuide Capability

DesignSeminars

Two DesignSeminars from Agilent EEsof EDA on linearization techniques offer additional technical training and insight. These DesignSeminars present the DesignGuide developer in a CD-ROM-based video and slide presentation.

The linearization DesignSeminars are:

• Adaptive Feedforward Linearization for Power Amplifiers (part number N3500A)
  
• Adaptive RF Predistortion of Power Amplifiers (part number N3501A)
  

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Linearizer DesignGuide: Performance of the Feedforward Linearizer
Based on a Reverse Link IS-95 CDMA Signal

License Dependency Table

Click on the following link to see a table of dependencies that shows which simulator licenses are required for the various test benches in this DesignGuide:

• Linearizer DesignGuide License Dependency Table (PDF file, 10 KB)
  

For More Information ...

• ADS 2003C - What's New: Linearizer DesignGuide with Digital Predistortion
  

Technical Articles

Click on the following links for technical articles describing designs in which the Linearizer DesignGuide was used:

• Kelly Mekechuk, Wan-Jong Kim, and Shawn P. Stapleton, Simon Fraser University, Jong Heon Kim, Kwangwoon University, Linearizing Power Amplifiers Using Digital Predistortion, EDA Tools and Test Hardware, High Frequency Electronics, April 2004. PDF, 437 KB. Current issue: High Frequency Electronics.
  
• Seminar: Gain Without Pain, November 2000 - Adaptive FeedForward Linearization for RF Power Amplifiers
  
• Seminar: Gain Without Pain, November 2000 - Adaptive Digital Predistortion of Power Amplifiers
  
• Shawn P. Stapleton, Amplifier Linearization Using Adaptive RF Predistortion, Applied Microwave & Wireless, March 2001.
  

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