2.2. Quadrature oscillator with Amplitude control
If a coupled form digital oscillator that uses finite precision
arithmetic is simulated, it can be seen that the amplitude
deviates with time from the ideal case. For example,
if we consider a coupled form oscillator that uses 14-bit
precision and the generated frequency is
then the difference between the ideal sine wave and the
generated one is presented in Figure 1a. The amplitude
deviation increases rapidly as the number of bits used to
represent the samples and the coefficients decreases. The
output amplitude degradation, for a coupled form oscillator,
is also frequency dependent.