mixed-mode-analysislisted

# Mixed-mode S-parameter analysis Expert guide for mixed-mode S-parameters from single-ended measurements, and for reading the source datasets in CloudSprite. **Reference:** Bert Simonovich, "A Guide for Single-Ended to Mixed-Mode S-Parameter Conversions," *Signal Integrity Journal*, July 2020. This plugin's MCP is **read-only**. You may inspect CloudSprite datasets and explain or compute locally. You may **not** publish new datasets or notebooks through MCP. ## What mixed-mode is A VNA measures **single-ended** S-parameters. For a differential device with 4 ports (2 in, 2 out) that is a 4×4 matrix (16 parameters). **Mixed-mode** rewrites that matrix into differential and common-mode behavior: ```text [ SDD SDC ] [ SCD SCC ] ``` | Quadrant | Stimulus | Response | Meaning | |-|-|-|-| | **SDD** | Differential | Differential | Differential gain/loss — primary figure of merit | | **SCC** | Common | Common | Common-mode transmission | | **SDC** | Common | Differential | Common → differential conversion | | **SCD** | Differential | Common | Differential → common conversion | A well-designed differential path has high SDD21, low SCC21 (rejection), and near-zero SDC/SCD (balance). **CMRR (dB):** `|SDD21_dB| − |SCC21_dB|` A single 2-port measurement cannot separate differential from common mode. You need all four port-pair interactions. ## Confirm before computing Wrong port mapping produces numbers that look fine and are physically wrong. Always verify mapping **before