Abstract: A digital tuning circuit (100) for a filter (120) has a filter input and a filter output and employs a switchable element array (122). The filter includes a tuning signal generator (104) that generates a tuning signal (106) that is delivered to the filter input and a clock circuit (102) that generates a periodic stream of pulses. The digital tuning circuit includes a delay circuit (110), a phase comparator (130) and an integrating up-down counter (140). The delay circuit (110) is responsive to the tuning signal generator (104) and delays the tuning signal (106) by a predetermined amount corresponding to the nominal delay through the filter (120). The integrating up-down counter (140) counts pulses in a first direction when the phase comparator (130) generates the first value and counts pulses in a second direction, opposite from the first direction, when the phase comparator (130) generates the second value.