MixIMTA_Setup (Single-RF Intermodulation Table Extractor)
Symbol
Available in ADS
Parameters
| Name | Description | Units | Default |
|---|---|---|---|
| Filename | Name of IMT file to be generated | "imtfile.imt" | |
| RFharms | Number of RF harmonics involved in mixing | None | 2 |
| LOharms | Number of LO harmonics involved in mixing | None | 2 |
| LOpowr_Start | Nominal or lowest power of LO signal generated | dBm | -10 |
| LOpowr_Stop † | Highest power of LO signal generated (if swept) | dBm | |
| LOpowr_Step † | Increment in LO signal power (if swept) | dB | |
| RFpowr_Start | Nominal or lowest power of RF signal generated | dBm | -50 |
| RFpowr_Stop † | Highest power of RF signal generated (if swept) | dBm | |
| RFpowr_Step † | Increment in RF signal power (if swept) | dB | |
| LOfreq_Start | Nominal or lowest frequency of LO signal generated | Hz | 1.0 GHz |
| LOfreq_Stop † | Highest frequency of LO signal generated (if swept) | Hz | |
| LOfreq_Step † | Increment in LO signal frequency (if swept) | Hz | |
| RFfreq_Start | Nominal or lowest frequency of RF signal generated | Hz | 1.1 GHz |
| RFfreq_Stop † | Highest frequency of RF signal generated (if swept) | Hz | |
| RFfreq_Step † | Increment in RF signal frequency (if swept) | Hz | |
| † Values may be specified simultaneously in *_Stop and *_Step parameters, to sweep a corresponding variable. If both are left unspecified, only single point extraction occurs using the nominal value of the *_Start parameter. | |||
Notes/Equations
- MixIMTA_Setup is an intermodulation table generating component. When linked to a three pin mixer subcircuit, it is capable of stimulating the RF and LO inputs of the mixer using single-tone sinusoidal RF and LO signals at specified frequencies/powers, while capturing the IF output of the mixer to an intermodulation table (IMT) of specified size. It is possible to capture multiple IM tables to the same data file by sweeping RF and LO signal powers/frequencies.
- A-type (single RF tone) IMT files contain double side banded complex IF voltage values (dBm,deg), in matrices sized ( 2* RFharms + 1 ) x ( LOharms + 1), where RFharms and LOharms number of harmonics participate in the mixing process. Details of file format are described in Working with Data Files > IMT Format.
- Examine the sub-circuit of the extractor to see how the underlying harmonic balance simulation is set-up to achieve mixing. Although there is no theoretical upper limit on the number of harmonic indices that can be specified on this extractor, the user should establish a cut-off on the number of IF spurs to improve the performance of the underlying harmonic balance simulation.
- To understand the use model for this extractor see example design: BehavioralModels > MixIMT_prj > CKT_IMTA_extraction.dsn. Also see related component MixIMTB_Setup (Multi-RF Intermodulation Table Extractor).