Olle Hansson · Oscar Gustafsson
--- a/b_asic/signal_generator.py
+++ b/b_asic/signal_generator.py
+
+    def __init__(self, path) -> None:
+        try:
+            data = np.loadtxt(path, dtype=complex).tolist()
+            self._data = data
+            self._len = len(data)
+        except FileNotFoundError:
+            self._window.logger.error(f"Selected input file not found.")
+
+    def __call__(self, time: int) -> complex:
+        if 0 <= time < self._len:
+            return self._data[time]
+        return 0.0
+
+    def __repr__(self) -> str:
+        return f"ZeroPad({self._data})"
--- a/b_asic/signal_generator.py
+++ b/b_asic/signal_generator.py
+    """
+    Signal generator that reads from file and pads a sequence with zeros.
+
+    Parameters
+    ----------
+    path : string
+        Path to input file.
+    """
+
+    def __init__(self, path) -> None:
+        try:
+            data = np.loadtxt(path, dtype=complex).tolist()
+            self._data = data
+            self._len = len(data)
+        except FileNotFoundError:
+            self._window.logger.error(f"Selected input file not found.")