Patent ID: 6430126
Filing Date: 2002-08-06
Classification: G11B

Abstract:
A pick-up head controller for optical disk drives, featuring a high-frequency controller, comprising:a gain path, for providing a combinational forward gain value, wherein an input signal is input into a first summing element, and is then output and goes through, in sequence, a first amplifier circuit, a second amplifier circuit, a third amplifier circuit, and a fourth amplifier circuit, wherein the output of said fourth amplifier circuit is coupled, in sequence, to a second summing element and a third summing element; two forward gain paths, connected respectively to different amplifier circuits at one end and to different summing elements at the other end, for providing forward gain; three feedback gain paths, connected respectively to different amplifier circuits at one end and to different summing elements at the other end, for providing feedback gain; an output path having an amplifier circuit, connected to said third summing element, for providing an output gain value; an input path having an amplifier circuit, connected to the input signal at the input and said second summing element at the output, for providing an input gain value; and an averaging unit, connected to an input signal at the input and a low-frequency controller at the output, for providing an averaged input signal; wherein such an approach provides compensation in gain and phase, resulting in good actuation characteristics.