ADS Circuit Simulation Techniques

全长两个多小时视频课程，原版英文讲解。课程以使用ADS设计一个FET放大器为例，讲授了使用ADS软件进行仿真设计的全过程，涉及的内容包括：FET放大器设计、LoadPull DesignGuide的设置和使用、Smith圆图、匹配电路设计、ADS优化设计分析、谐波分析、双音交调分析、包络分析等内容。课程使用的软件版本为ADS2012，适合ADS2011之后各版本ADS软件的学习。

课程共分4节，每节都对应有课程讲解和实际设计操作讲解两部分，具体内容如下：

Part 1：FET Amplifier and Load Pull DesignGuide

The first part covers using a basic Load Pull DesignGuide setup for a FET from the built-in ADS DemoKit. Also included are the use of variables, a stability network, the Smith Chart contours, and more. The skills you will learn in this part can be applied to other simulations.

A Lab is included in this part. This Lab topics are Load Pull design guide and stability for a FET amplifier design, including:

• •  New Workspace with Load Pull Design Guide
• •  Set up the DemoKit FET for Load Pull
• •  Specify the Basic Variables and Simulate
• •  Stability Network and Rectangular Load Sweep
• •  Circular Sweep for Load Pull 
• •  Other Load Pull Results 
• •  Load Pull Summary

Part 2：Matching Designing and Optimization

This second part covers Optimization and Goals, including an overview of the ADS optimizer. It also covers how to use the Impedance Matching tool and more.

A Lab is included in this part. This Lab topics are Small-signal S-parameter optimization and designing matching networks for amplifiers and other designs. Optional is the Impedance Matching too. More details are:

• •  Amplifier Design with Template
• •  Simulate and examine Gain and Stability
• •  Set up an Optimization controller and Goals
• •  Enabling Variables or Parameters to be Optimized
• •  Running an Optimization
• •  Simulate with a Matching Network
• •  OPTIONAL: Impedance Matching tool

Part 3：Harmonic Balance Techniques

This third part covers Harmonic Balance simulations, including swept variables, IP3 and 2-tone analysis.

There also is a Lab in this part, demonstrating Harmonic Balance simulations including swept variables, 2-tone simulations, equations for HB data, compression, and IP3. More details about the Lab are:

• •  FET amplifier design
• •  Basic HB 1-tone Simulation
• •  Functions and Equations for Input Power and Zin
• •  Gain Compression using XDB
• •  Sweep Input Power and Bias Voltage
• •  Output Power, Gain, and Power Sweep with a Slider
• •  Two-tone HB Simulation with variables
• •  Spectrum and Mix table
• •  OPTIONAL: IP3 Simulation (Third Order Intercept Point)

Part 4：Circuit Envelope Simulations with Modulated Sources

The last part covers Circuit Envelope simulation, which uses modulated sources such as CDMA and GSM. The envelope data is also covered.

A Lab is included in this part, which demonstrating Circuit Envelope simulation using system components and a FET amplifier with GSM and CDMA modulated sources. More details about the Lab are:

• •  Create a new Workspace
• •  System Amp and PtRF source design
• •  Envelope simulation controller setup
• •  Simulate and plot the time domain response.
• •  Simulate with Amp distortion
• •  Amp with Demodulators for GSM
• •  GSM Envelope Simulation with VAR setup
• •  Copy FET AMP into the current workspace
• •  CDMA setup for FET Amp
• •  Example Data Display: ModSources_wrk
• •  CDMA simulation and data equation
• •  OPTIONAL – Distortion Effects using the Tune