Patent ID: 7106240

Claim:
A recirculating analogue to digital converter comprising: first, second and third storage and residual determination modules; an amplifier for use selectively with one of said storage and residual determination modules; and a comparator for determining a discrete output on the basis of an analogue input presented thereto, and for cooperation with said storage and residual determination modules to determine a residual based on the difference between a signal presented to the comparator and an analogue equivalent to said discrete output, said first storage and residual determination module being operable to cooperate with said amplifier and said comparator to cause generation of an initial discrete output and an initial residual on the basis of an analogue input presented to the analogue to digital converter, and said second and third storage and residual determination modules each being operable to cooperate in a recirculating manner on the basis firstly of the initial residual and then of residuals determined by each other, to cause generation of further discrete outputs.