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Calculations/rendered/Preamp-Current.md

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+```python
+import matplotlib.pyplot as plt
+import numpy as np
+from pint import UnitRegistry
+unit = UnitRegistry()
+unit.formatter.default_format = "~"
+unit.setup_matplotlib()
+
+
+gain_first_stage = 10e6 * unit.V / unit.A
+gain_second_stage = 100e3 / 1e3
+
+tunnel_current_in = np.linspace(1e-12, 10e-9, 100) * unit.A
+volts_out = tunnel_current_in * gain_first_stage * gain_second_stage
+
+plt.xscale("log")
+plt.plot(tunnel_current_in, volts_out)
+xticks = [1e-12, 10e-12, 100e-12, 1e-9, 10e-9] * unit.A
+plt.xticks(xticks, [f'{t.to("nA"):.3f~}' for t in xticks], minor=False)
+plt.xlabel("Tunneling Current")
+
+plt.yscale("log")
+yticks = [0.001, 0.010, 0.1, 1.0, 5] * unit.V
+plt.yticks(yticks, [f'{t.to("V"):.3f~}' for t in yticks], minor=False)
+plt.ylabel("Preamp Voltage")
+plt.grid(True, "both")
+```
+
+
+    
+![png](Preamp-Current_files/Preamp-Current_0_0.png)
+    
+
+
+
+```python
+v = 0.359 * unit.V
+a = v / (gain_first_stage * gain_second_stage)
+a.to("pA")
+```
+
+
+
+
+359.0 pA
+
+
+
+
+```python
+
+```