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The HMC661LC4B is a SiGe monolithic, fully differential, single rank, track-and-hold (T/H) that provides unprecedented bandwidth and dynamic-range performance...
HMC661 on Analog.com
Are single-ended and differential one-port S-parameters for the two sampling inputs on the HMC661 available? I can't find them on the datasheet or web page.
Please find the 3 port s-parameters of HMC661-track mode, taken on the evaluation board.
Keep in mind that the connector and trace losses are included in these measurements for S21.