and the phase-90 ~ The plots are thus straight lines. When co = 1 rad/s
then the gain is 0. When 09 = 10 rad/s it is -20 dB. When o9 = 100 rad/s
it is -40 dB. Thus the slope of the gain line for a transfer function of 1/s
is -20 dB for each tenfold increase in frequency (this is termed a
decade).
For G(s) = 1/s ~ we have G(jco) = 1/(jco) ~ = -(j/co)". For such a system
the gain is: