Added companion functions for noise lookup

src/pygmid/Lookup.py

@@ -5,7 +5,7 @@
 from scipy.interpolate import interpn
 import pickle
 
-from .constants import eps
+from .constants import *
 from .numerical import interp1
 
 class Lookup:
@@ -378,3 +378,38 @@ def look_upVGS(self, **kwargs):
             output = output[:]
 
         return np.squeeze(output)
+
+    def gamma(self, **kwargs):
+        """
+        Companion gamma function. Computes gamma from:
+
+            STH/gm * 1/(4kT)
+        
+        where STH is thermal noise psd at 1 Hz
+            
+        Args:
+            **kwargs: lookup parameters, GM_ID, length, VDS etc...
+        Output:
+            output: interpolated data specified by outkeys. Squeezed to remove extra
+                    dimensions
+        """
+
+        # should provide a GMID, VDS and L
+        return self.look_up('STH_GM', **kwargs)/(4*kB*self['TEMP'].item())
+
+    def fco(self, **kwargs):
+        """
+        Companion flicker corner function. Computes flicker corner from:
+
+            SFL/STH
+        
+        where STH is thermal noise psd at 1 Hz
+        and SFL is flicker noise psd at 1 Hz
+            
+        Args:
+            **kwargs: lookup parameters, GM_ID, length, VDS etc...
+        Output:
+            output: interpolated data specified by outkeys. Squeezed to remove extra
+                    dimensions
+        """
+        return self.look_up('SFL_STH', **kwargs)

src/pygmid/constants.py

@@ -1,3 +1,5 @@
 import numpy as np
+from scipy.constants import k
 
-eps = np.finfo(float).eps
+eps = np.finfo(float).eps
+kB = k

tests/debug/debug_lookup.py

@@ -97,8 +97,4 @@
 # %%
 # test for utility function
 gm_ID = NCH.look_up('GM_ID', VDS=np.arange(0.025, 1.2+0.025, 0.025), VSB=0.0, L=0.18)
-print(gm_ID)
-
-# %%
-gmID = NCH.look_up('GM_ID',vgs=VGSs,vds=VDsat,L=L)
-JDsat = NCH.look_up('ID_W',GM_ID=np.linspace(2,25))
+print(gm_ID)