def touchstone_options(obj):
    r"""
    Validate if an object is an :ref:`TouchstoneOptions` pseudo-type object.

    :param obj: Object
    :type  obj: any

    :raises: RuntimeError (Argument \`*[argument_name]*\` is not valid). The
     token \*[argument_name]\* is replaced by the name of the argument the
     contract is attached to

    :rtype: None
    """
    if (not isinstance(obj, dict)) or (
        isinstance(obj, dict)
        and (sorted(obj.keys()) != sorted(["units", "ptype", "pformat", "z0"]))
    ):
        raise ValueError(pexdoc.pcontracts.get_exdesc())
    if not (
        (obj["units"].lower() in ["ghz", "mhz", "khz", "hz"])
        and (obj["ptype"].lower() in ["s", "y", "z", "h", "g"])
        and (obj["pformat"].lower() in ["db", "ma", "ri"])
        and isinstance(obj["z0"], float)
        and (obj["z0"] >= 0)
    ):
        raise ValueError(pexdoc.pcontracts.get_exdesc())
r"""
    Validate if an object is an :ref:`TouchstoneOptions` pseudo-type object.

    :param obj: Object
    :type  obj: any

    :raises: RuntimeError (Argument \`*[argument_name]*\` is not valid). The
     token \*[argument_name]\* is replaced by the name of the argument the
     contract is attached to

    :rtype: None