# Chapter 8:Microwave Diodes, Quantum-Effect, and Hot-Electron Devices¶

## Example 8.1 Page 257¶

In [3]:
#initialisation of variable
from math import *
L=10*10**-9;#inductance
C=4*10**-12;#capacitance

#calculation
Z=(L/C)**.5;#impedence

#result
print"characteristics impedence is",round(Z,2),"ohm"

characteristics impedence is 50.0 ohm


## Example 8.2 Page 258¶

In [1]:
#initialisation of variable
from math import *
a=.05;#m
b=.025;#cm
d=.1;#m
c=3*10**8;#speed

#calculation
f=c/2*((1/a)**2+(1/d)**2)**.5;#frequency

#result
print"resonant frequncy is",round(f/10**9,3),"GHz"

resonant frequncy is 3.354 GHz


## Example 8.3 Page 263¶

In [1]:
#initialisation of variable
from math import *
b=10**-4;
W=6*10**-4;#width
F=3.3*10**5;#field
Q=2*10**12;#charge density
q=1.6*10**-19;#charge
D=11.9;
E=8.85*10**-14;#constant

#calculation
a=W-b;
Vb=(F*10**-4+(F-q*Q/D/E)*a);#brekdown voltage
Fd=13/a;#field
f=10**7/2/a;#frequency

#result
print"breakdown voltage is",round(Vb,2),"V"
print"field in drift region is",round(Fd,2),"V/cm"
print"frequency is",round(f/10**9,2),"GHz"

breakdown voltage is 46.07 V
field in drift region is 26000.0 V/cm
frequency is 10.0 GHz


## Example8.4 Page269¶

In [4]:
#initialisation of variable
from math import *
l=10;#length
L=10**-3;
v=10**7;#velocity

#calculation
t=L/v;#time

#result
print"time required is",round(t*10**9,2),"ns"

time required is 0.1 ns


## Example 8.5 Page 273¶

In [2]:
#initialisation of variable
from math import *
Lw=4.5;#nm
Vp1=700;#mV
Vp2=280;#mV

#calculation
V=Vp1-Vp2;

#result
print"ground water level is 140mV and peak width is 1meV for",round(Lw,1),"nm"
print"difference of voltage drop due to accumulation and depletion region is",round(V,2),"mV"

ground water level is 140mV and peak width is 1meV for 4.5 nm
difference of voltage drop due to accumulation and depletion region is 420.0 mV