Using Wireless Sources and Expressions

Introduction

The Wireless Sources available in RF Design Environment are useful for traditional Analog/RF measurements. In the initial stages of an RFIC design you may need to stimulate the design with proper wireless standard signals. Wireless sources generate complex signals useful for traditional measurements. Additionally, these can be used for wireless system measurements, such as WLAN EVM, using the set of Wireless Expressions.
The Wireless Sources are provided as part of the adsLib library in RFDE for wireless standard signal generation. These are configurable source components and their use model is similar to adsLib power sources such as P_1Tone. Wireless sources can be used in different analyses such as Circuit Envelope, and S-parameter just like other adsLib library sources.
The Wireless Expressions can be found in the Expression Builder under Env analysis type. For more complex measurements, such as BER, you must use the Wireless Test Bench Models using the WTB analysis. For details about using the Wireless Test Bench Models, refer to Chapter 3, Using Wireless Test Bench Models.

Setting up a Circuit Envelope Analysis

In the early stages of RFIC design you can use the wireless sources to generate the standard wireless signal required to stimulate the RFIC design under test (DUT). These sources, part of the adsLib library under Sources Modulated , can be placed on the schematic design similar to other adsLib source components. The sources are typically used with Circuit Envelope analysis.
To set up the DUT for a Circuit Envelope analysis:

1. Open the Analog Design Environment window. This can be done from the schematic window using Tools > Analog Design Environment .
2. In the Analog Design Environment window, select Analyses > Choose to open the Choosing Analyses window.
3. Choose the Env analysis. Update the parameters with the stop time, time step, and frequencies of interest.
   To set up wireless expressions for measurements:

1. In the Analog Design Environment window, select Outputs > Measurement Expressions .
2. In the Measurement Expressions window, choose Build Expressions .
3. In the RFDE Expression Builder window, select the Env analysis type. The list of Measurements includes wireless expressions in the list of Env expressions.
4. Select the expression, the DUT node to operate on, and set the parameters. Click OK . The expression appears in the string field in the Measurement Expressions window.
5. In the Measurement Expressions window, on the left side of the string field, add the expression name or the equation's left side followed by = . Click Add to add this expression to the expression list.