TTLHardwareLogicHBridgedCurrentSource¶

Class Arguments

Argument	Type	Default Value
switch_direction	Switchable
switch_on	Switchable
current_source	CurrentSource
invert_direction	TBool	False
min_current	TFloat	-inf
max_current	TFloat	inf
default_ramp_steps	TInt32	30

Bold arguments are mandatory. For more documentation on the listed arguments refer to the class definition below. If parameters appear in this list but not in the class definition below, please recursively check the linked base classes for the definition of the parameter.

Inheritance Diagram

Example Component Dictionary

   {
    "currentsource_example": {
        "classname": "atomiq.components.electronics.currentsource.TTLHardwareLogicHBridgedCurrentSource",
        "arguments": {
            "switch_direction": "<mandatory parameter (Switchable)>",
            "switch_on": "<mandatory parameter (Switchable)>",
            "current_source": "<mandatory parameter (CurrentSource)>",
            "invert_direction": false,
            "min_current": -1e999,
            "max_current": 1e999,
            "default_ramp_steps": 30
        }
    }
}

Class Description

class atomiq.components.electronics.currentsource.TTLHardwareLogicHBridgedCurrentSource(switch_direction, switch_on, invert_direction=False, *args, **kwargs)[source]

Bases: HBridgedCurrentSource

H-bridged current source with control logic implemented in hardware

Some external hardware (logic gates) take care to set all MOSFETs of the H-bridge based on the desired direction as indicated by switch_direction. Via switch_on the entire bridge can be enabled and disabled.

`switch_on`	`switch_direction`	current flow
off	on	off
off	off	off
on	on	forward
on	off	reverse

Parameters:

switch_on (Switchable) -- When ON, H-bridge is eith forward or reverse; when OFF, load is disconnected from the PSU
switch_direction (Switchable) -- select forward or reverse direction of current flow
invert_direction (TBool) -- flip forward/reverse

A Parametrizable is an entity that can be controlled by one or more continuous parameter(s)

class HBridgeState(value)

Bases: IntEnum

conjugate(): Returns self, the complex conjugate of any int.

bit_length()

Number of bits necessary to represent self in binary.

>>> bin(37)
'0b100101'
>>> (37).bit_length()
6

bit_count()

Number of ones in the binary representation of the absolute value of self.

Also known as the population count.

>>> bin(13)
'0b1101'
>>> (13).bit_count()
3

to_bytes(length=1, byteorder='big', *, signed=False)

Return an array of bytes representing an integer.

length: Length of bytes object to use. An OverflowError is raised if the integer is not representable with the given number of bytes. Default is length 1.
byteorder: The byte order used to represent the integer. If byteorder is 'big', the most significant byte is at the beginning of the byte array. If byteorder is 'little', the most significant byte is at the end of the byte array. To request the native byte order of the host system, use `sys.byteorder' as the byte order value. Default is to use 'big'.
signed: Determines whether two's complement is used to represent the integer. If signed is False and a negative integer is given, an OverflowError is raised.

classmethod from_bytes(bytes, byteorder='big', *, signed=False)

Return the integer represented by the given array of bytes.

bytes: Holds the array of bytes to convert. The argument must either support the buffer protocol or be an iterable object producing bytes. Bytes and bytearray are examples of built-in objects that support the buffer protocol.
byteorder: The byte order used to represent the integer. If byteorder is 'big', the most significant byte is at the beginning of the byte array. If byteorder is 'little', the most significant byte is at the end of the byte array. To request the native byte order of the host system, use `sys.byteorder' as the byte order value. Default is to use 'big'.
signed: Indicates whether two's complement is used to represent the integer.

as_integer_ratio()

Return integer ratio.

Return a pair of integers, whose ratio is exactly equal to the original int and with a positive denominator.

>>> (10).as_integer_ratio()
(10, 1)
>>> (-10).as_integer_ratio()
(-10, 1)
>>> (0).as_integer_ratio()
(0, 1)

real: the real part of a complex number

imag: the imaginary part of a complex number

numerator: the numerator of a rational number in lowest terms

denominator: the denominator of a rational number in lowest terms

append_to_dataset(key, value)

Append a value to a dataset.

The target dataset must be a list (i.e. support append()), and must have previously been set from this experiment.

The broadcast/persist/archive mode of the given key remains unchanged from when the dataset was last set. Appended values are transmitted efficiently as incremental modifications in broadcast mode.

build()

Should be implemented by the user to request arguments.

Other initialization steps such as requesting devices may also be performed here.

There are two situations where the requested devices are replaced by DummyDevice() and arguments are set to their defaults (or None) instead: when the repository is scanned to build the list of available experiments and when the dataset browser artiq_browser is used to open or run the analysis stage of an experiment. Do not rely on being able to operate on devices or arguments in build().

Datasets are read-only in this method.

Leftover positional and keyword arguments from the constructor are forwarded to this method. This is intended for experiments that are only meant to be executed programmatically (not from the GUI).

call_child_method(method, *args, **kwargs)

Calls the named method for each child, if it exists for that child, in the order of registration.

Parameters:

method (str) -- Name of the method to call
args -- Tuple of positional arguments to pass to all children
kwargs -- Dict of keyword arguments to pass to all children

get_argument(key, processor, group=None, tooltip=None)

Retrieves and returns the value of an argument.

This function should only be called from build.

Parameters:

key -- Name of the argument.
processor -- A description of how to process the argument, such as instances of BooleanValue and NumberValue.
group -- An optional string that defines what group the argument belongs to, for user interface purposes.
tooltip -- An optional string to describe the argument in more detail, applied as a tooltip to the argument name in the user interface.

get_dataset(key, default=<class 'artiq.language.environment.NoDefault'>, archive=True)

Returns the contents of a dataset.

The local storage is searched first, followed by the master storage (which contains the broadcasted datasets from all experiments) if the key was not found initially.

If the dataset does not exist, returns the default value. If no default is provided, raises KeyError.

By default, datasets obtained by this method are archived into the output HDF5 file of the experiment. If an archived dataset is requested more than one time or is modified, only the value at the time of the first call is archived. This may impact reproducibility of experiments.

Parameters:: archive -- Set to False to prevent archival together with the run's results. Default is True.

get_dataset_metadata(key, default=<class 'artiq.language.environment.NoDefault'>)

Returns the metadata of a dataset.

Returns dictionary with items describing the dataset, including the units, scale and precision.

This function is used to get additional information for displaying the dataset.

See set_dataset() for documentation of metadata items.

get_device(key): Creates and returns a device driver.

get_device_db(): Returns the full contents of the device database.

interactive(title='')

Request arguments from the user interactively.

This context manager returns a namespace object on which the method setattr_argument() should be called, with the usual semantics.

When the context manager terminates, the experiment is blocked and the user is presented with the requested argument widgets. After the user enters values, the experiment is resumed and the namespace contains the values of the arguments.

If the interactive arguments request is cancelled, raises CancelledArgsError.

mutate_dataset(key, index, value)

Mutate an existing dataset at the given index (e.g. set a value at a given position in a NumPy array)

If the dataset was created in broadcast mode, the modification is immediately transmitted.

If the index is a tuple of integers, it is interpreted as slice(*index). If the index is a tuple of tuples, each sub-tuple is interpreted as slice(*sub_tuple) (multi-dimensional slicing).

ramp_current(duration, current_end, current_start=nan, ramp_timestep=nan, ramp_steps=-1)

Ramp current over a given duration.

This method advances the timeline by duration

Parameters:

duration (artiq.compiler.types.TMono('float', OrderedDict())) -- ramp duration [s]
current_end (artiq.compiler.types.TMono('float', OrderedDict())) -- end current [A]
current_start (artiq.compiler.types.TMono('float', OrderedDict())) -- initial current [A]. If not given, the ramp starts from the current operating current.
ramp_timestep (artiq.compiler.types.TMono('float', OrderedDict()))
ramp_steps (artiq.compiler.types.TMono('int', OrderedDict([('width', artiq.compiler.types.TValue(32))])))

set_current(current)

Set the current delivered by the current source

Parameters:: current (artiq.compiler.types.TMono('float', OrderedDict())) -- Current in A

set_dataset(key, value, *, unit=None, scale=None, precision=None, broadcast=False, persist=False, archive=True)

Sets the contents and handling modes of a dataset.

Datasets must be scalars (bool, int, float or NumPy scalar) or NumPy arrays.

Parameters:

unit -- A string representing the unit of the value.
scale -- A numerical factor that is used to adjust the value of the dataset to match the scale or units of the experiment's reference frame when the value is displayed.
precision -- The maximum number of digits to print after the decimal point. Set precision=None to print as many digits as necessary to uniquely specify the value. Uses IEEE unbiased rounding.
broadcast -- the data is sent in real-time to the master, which dispatches it.
persist -- the master should store the data on-disk. Implies broadcast.
archive -- the data is saved into the local storage of the current run (archived as a HDF5 file).

set_default_scheduling(priority=None, pipeline_name=None, flush=None)

Sets the default scheduling options.

This function should only be called from build.

setattr_argument(key, processor=None, group=None, tooltip=None)

Sets an argument as attribute. The names of the argument and of the attribute are the same.

The key is added to the instance's kernel invariants.

setattr_dataset(key, default=<class 'artiq.language.environment.NoDefault'>, archive=True): Sets the contents of a dataset as attribute. The names of the dataset and of the attribute are the same.

setattr_device(key)

Sets a device driver as attribute. The names of the device driver and of the attribute are the same.

The key is added to the instance's kernel invariants.