Clock generator producing clock signal quickly adjusted to target frequency

摘要

A frequency monitor compares an actual frequency of an oscillating circuit with a target frequency for producing a control signal representative of the comparison result, a controller is responsive to the control signal so as to trim the resistance of a resistor string with an n-bit control signal regulated through a binary search algorithm, and quickly adjusts the actual frequency to the target frequency, because the trimming operation is only repeated n times at the maximum.