from math import log

L_n = 0.6E-6
L_p = 0.6E-6
K_n = 122E-6
K_p = 61E-6
C_ox = 33E-4
V_tn = 0.7
V_tp = -0.7

# 2a
V_gs = 5
V_ds = 5
V_dsat = V_gs - V_tn
I_ds = 2.82E-3

w_n = (2*I_ds*L_n) / (K_n * V_dsat**2)
print("2a:", w_n)

# 2b
w_p = (2*I_ds*L_p) / (K_p * V_dsat**2)
print("2b:", w_p)
# 2c
C_g = C_ox*w_n*L_n
C_equiv = 12*C_g + 20E-15
print("C_g:", C_g)
print("C_equiv:", C_equiv)

beta = K_n*w_n/L_n
print("beta:", beta)

I_sat = beta * (V_gs - V_tn)**2 / 2
print("I_sat:", I_sat)
t_sat = V_tn*C_equiv / I_sat
print("t_sat:", t_sat)

R = 10E3
print("R:", R)
tau = R*C_equiv
print("tau:", tau)

# v(t) = 0.5 = 4.3e^(-t/tau)
t_lin = -tau*log(0.5/4.3)
print("t_lin:", t_lin)
t = t_lin + t_sat
print("t:", t)

# 2e
t_pd = R*C_equiv
print("t_pd:", t_pd)