Advanced Design System
by Michael Ellis, All Rights Reserved

More Tutorials

Click here for application notes and tutorials on ADS from Agilent

This page is a concise tutorial of HP's ADS software using a 3 transistor amplifier as an example. The amplifier is to have a gain of 25 to 25.5 dB over 5-210 MHz for use as a cable TV reverse amplifier. The schematic, captured with ADS, is shown below. The MRF581A can be selected from the Component Library under RF Transistor Library/Packaged BJTs. The input and output nodes are named under Component/Name Node. The input source is selected using Sources-Freq Domain/P_nHarm. The output termination is selected under the menu item Simulation-S_Param/Term.

Setup parameters for optimization are given below, along with the necessary simulation definitions for spectral analysis (harmonic balance), time domain waveforms (transient), dc annotation (dc), and s-parameter (s parameters) analysis. A component is selected for optimization by selecting the component, then selecting Optimization/Statistics Setup. Status should be "Enabled", with type "Continuous" and Format "min/max". Minimum and maximum values can be specified. Notice that R11, R13, R15, and L5 have been set up for optimization.

After optimization, select Simulate/Update Optimization Values. The DC bias voltages can be displayed by selecting Simulate/Annotate DC Solution. On some PCs, optimization needs to be disabled after the Simulate/Update Optimization Values, and the circuit resimulated before the dataset parameters (s-parameters, harmonic balance, etc.) can be displayed. Sample ADS output screens are shown below, including harmonic distortion components.

Download this three transistor ADS design file.

Other Resources

10 Helpful Hints for Using Advanced Design System (154 kB)
Generating Custom, Real-World Waveforms for 3G Wireless Applications (929 kB)
CDMA Source Generation for ACPR/ACI Simulation (128 kB)
Designing to Digital Wireless Specifications Using Circuit Envelope Simulation (224 kB)
Developing an Environment for Mixed RF and DSP Design (485 kB)
Low Power Mixer Design Example Using Advanced Design System (486 kB)
Mixer Simulation with Advanced Design System (190 kB)