In [1]:

    

import pandas as pd
import numpy as np
import matplotlib.pyplot as plt
%matplotlib inline


    

In [3]:

    

df = pd.read_csv('FET_data.csv', header=None)
df.head()


    

    
Out[3]:







  

    

      

      
0
      
1
    
  
  

    

      
0
      
-40
      
8.170000e-10
    
    

      
1
      
-39
      
1.190000e-09
    
    

      
2
      
-38
      
1.070000e-09
    
    

      
3
      
-37
      
1.350000e-09
    
    

      
4
      
-36
      
1.410000e-09
    
  

In [9]:

    

V = df[0].values
I = df[1].values
logI = np.log10(I)


    

In [13]:

    

plt.plot(V,logI)
plt.xlabel('Voltage (V)')
plt.ylabel('Log of Current (logA)')
plt.title('Voltage vs. Current of a FET')
plt.show()


    

In [16]:

    

on_off_ratio = np.max(I)/np.min(I)
on_off_ratio


    

    
Out[16]:





855045.87155963306

In [18]:

    

loc = np.argwhere(I==min(I))


    

In [20]:

    

Vt_array = V[loc]


    

In [21]:

    

Vt_flt = float(Vt_array)


    

In [22]:

    

Vt_flt


    

    
Out[22]:





4.0

In [23]:

    

type(Vt_flt)


    

    
Out[23]:





float

In [35]:

    

print('The on/off ratio is {0:4.1f} and the threshold voltage is {1:2.1f} V'.format(on_off_ratio,Vt_flt))


    

    




The on/off ratio is 855045.9 and the threshold voltage is 4.0 V