METHOD AND APPARATUS FOR PROGRAMMABLE DELAY HAVING FINE DELAY RESOLUTION

摘要

An programmable delay apparatus (200) includes a first delay stage (210) having a delay cell (230) which includes a passive network (214), where the first stage is capable of providing a first time delay. The apparatus further includes a second delay stage (220) which includes a plurality of delay cells (240_l, 240_2, 240_3, 240_4, 240_5, 240_6), where each delay cell is capable of providing a second time delay which is larger than the first time delay. A method for delaying an input signal (INPUT) includes receiving a delay select command (sel_dly0... sel_dly6) based upon the desired time delay, establishing a circuit path which includes at least one delay element, selected from a plurality of delay cells (210, 220) according to the delay select command, wherein at least one of the plurality of delay cells includes a delay element (230) which comprises a passive network (214).