Using ADS to design an MMIC Amplifier(40 页)

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Contents
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
Two-Stage MMIC Amplifier Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Branch-Line Coupler Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Conclusion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Appendixes
Appendix A – Using the Advanced Model Composer
to Create a Library of Inductor Models . . . . . . . . . . . . . . . . . . . . .30
Appendix B – Running the Design Rule Checker . . . . . . . . . . . . . . . . . . . . . . . . .37
Introduction
There are many design steps required for the development and manufacture of MMIC
circuits, as illustrated in the MMIC Design Flow. Advanced Design System (ADS) is a
central part of the complete MMIC design flow, and is used throughout this process.
This application note illustrates, through the design of an MMIC amplifier, several of the
common problems faced in designing, simulating, and producing a physical layout of an
MMIC circuit, as well as the validation steps that are needed to verify that the physical
layout still produces the desired result. It is beyond the scope of this note to describe all
possible design specifications for an MMIC circuit, but it does include enough specification
and design steps to address many common design challenges.
The following sections give a step-by step description of a 0.5-Watt, 10-GHz, narrow-band amplifier on a 100-μm GaAs substrate. The example files that are used here.

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