Antialiasing filter with an improved S/N ratio

Describes a CCD low pass filter for antialiasing employing a higher data rate at the input compared to the output, which is used to increase the signal-to-noise ratio. By adding a given number of consecutive charge packets at the output stage, the output data rate can be reduced until the Nyquist theorem for the output signal is violated. By summing up those charge packets, the signal is added arithmetically whereas the noise, not being correlated, is added geometrically. This results in an improvement of the S/N ratio equal to the number of charge packets added.