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"dcblock" and "dcfeed" are very common in RF simulator such as Keysight ADS and Keysight Goldengate.
They are available even in Cadence Spectre after version 14 or 11.
"dcblock" has to be "perfect short" except for DC and Tran Analyses. "dcfeed" has to be "perfect open" except for DC and Tran Analyses.
These are implemented correctly for AC and PSS Analyses of Cadence Spectre.
But they are wrong for PAC Analysis of Cadence Spectre.
"dcblock" is treated as "open" for sideband=0 in PAC Analysis. "dcfeed" is treated as "short" for sideband=0 in PAC Analysis.
These are wrong.
These are true for all slave small signal analyses subjected to master large signal analyses.
Behavior of "dcblock" and "dcfeed" are completely wrong in PAC, PXF, PNoise, PSP, PSTB, QPAC, QPXF, QPNoise, QPSP, HBAC, HBXF, HBNoise and HBSP.
My Spectre's Version is "17.1.0.124".
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