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Ampsa Design Wizards

Innovative Amplifier Design Tools

Ampsa's Amplifier Design Wizard (ADW) provides comprehensive control of the intrinsic and external impedances presented to transistors in linear power amplifiers.  Similar features are provided in the Matching Wizard (MW), but no control over the intrinsic terminations is possible with the MW.

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Differential evolution or systematic searches are used in both tools when matching networks are synthesized. The evolution is in Q-space, while the systematic searches are on the Qs or the transmission-phase shift.

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The comprehensive control provided over the fundamental-frequency and harmonic terminations leads to better efficiency in the amplifiers designed. Higher efficiency reduces transistor stress, energy consumption and maintenance requirements - directly improving reliability and performance.

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The matching problems to be solved can be defined by using load-pull hardware, load-pull with nonlinear transistor models or clipping theory.

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​Clipping theory has been extended to a fully useful point in the ADW. S-parameters and I/V-curve boundaries are used to setup ADW transistor models. The ADW models can be fine-tuned by comparing the performance of a designed amplifier with measurements, or by using an accurate nonlinear model.

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The CIL Wizard in the ADW provides control of the intrinsic impedances presented to a transistor and is used to set up diverse power-matching problems, which are then solved with the Impedance-Matching module.​​

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Automate Complex Tasks

The ADW and the MW automate many amplifier design tasks:

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  • The CIL wizard in the ADW lets you set up diverse power-matching problems, which are then solved with the Impedance-Matching module.

  • The CIR wizard is used to control the available power gain and/or the noise figure of an amplifier stage.

  • The IIM wizard is used to setup basic matching problems, including small-signal gain control interstage matching networks. It can also setup the specifications for image impedance half-sections.

  • The Impedance-Matching Modules are used to synthesize solutions to matching problems. The Distributed Networks Wizards provided in these modules are used to setup specifications for distributed networks.

  • The CMA wizard synthesizes phase-controlled matching networks. The networks synthesized are derived from PI- and T-section topologies. Parallel elements or resonating sections can be used in the shunt branches.

  • ​The DSLT wizard synthesizes stepped transmission-line transformers with geometric-mean, maximally flat, or Chebyshev responses. Lines can also be tapered (Stepped Klopfenstein or geometric-mean tapers).

  • The Modification Network wizard provided in the ADW synthesizes lossy sections to stabilize transistors, level the power gain of interest and reduce gain-bandwidth constraints.

  • A microstrip wizard is provided to convert distributed ADW and MW circuits to microstrip circuits. Hammerstadt or Gopinath models, or S-parameter based models can be used for the microstrip junctions. Because of the inherent accuracy, S-parameter based junctions should be used when the harmonics are controlled.

  • The parameters for S-parameter based junctions must be generated externally. The junctions can be extracted automatically from an ADW or MW circuit file, after which the artwork for each junction can be exported in the format required for EM simulation. The file names are setup to allow the simulation results to be imported efficiently into the ADW or MW.

  • The ADW artwork can be converted to Sonnet Software (R) .son format or Microwave Office (TM) basic scripts. ADW schematics can also be converted to basic scripts. The artwork and the schematics can also be exported in DXF format. 

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