Devices and methods to improve tracking error signals for optic storage systems

A servo control system comprising:

• a photo-detector to detect a position of a laser spot;
• a set of photo-detector elements formed in the photo-detector to provide optical detection signals regarding the position of the laser spot;
• an amplifier circuit to generate a tracking error (TE) signal in accordance with an algorithm;
• and
• a circuit for generating a compensation signal (TC) to compensate a swing of the TE signal, the circuit further comprising:
• a set of peak detection devices corresponding to the set of photo-detector elements, each of the peak detection devices detecting a peak amplitude of an optical detection signal derived from a corresponding photo-detector element;
• a set of amplifiers of a same gain corresponding to the set of peak detection devices, the gain being selectable between an inverting and a non-inverting terminals;
• a set of gain selection signals corresponding to the set of amplifiers to select one of the inverting and non-inverting terminals;
• and
• an adder for adding the amplitudes that are gain selected.

A servo control system comprising:

• a photo-detector to detect a position of a laser spot;
• a set of photo-detector elements formed in the photo-detector to provide optical detection signals regarding the position of the laser spot;
• a tracking error (TE) signal generated in accordance with an algorithm;
• a compensation signal (TC) associated with the algorithm to compensate a TE signal swing further comprising a linear combination of peak (X) representing an envelope peak amplitude value of an optical detection signal derived from one of the photo-detector elements X of the photo-detector;
• and
• a swing signal associated with the algorithm to represent the TE signal swing;
• wherein a peak amplitude of the swing signal and a peak amplitude of the TC signal are measured in compensating the TE signal swing.

A servo control system comprising:

• a first circuit to generate a tracking error (TE) signal in accordance with an algorithm;
• a TE swing produced in generating the TE signal in accordance with the algorithm;
• a swing signal associated with the algorithm generated to represent the TE swing;
• and
• a second circuit to generate a compensation signal (TC) to compensate the TE swing, the TC signal being K times in amplitude and reverse in polarity with respect to the TE swing, K being a coefficient;
• wherein the coefficient K is determined by dividing a peak amplitude of the swing signal with a peak amplitude of the TC signal.

A method of compensating a tracking error (TE) swing in a servo control system, comprising:

• determining an algorithm for generating a TE signal;
• generating a swing signal associated with the algorithm that represents the TE swing;
• generating a compensation signal (TC) associated with the algorithm;
• measuring an amplitude of the swing signal as VTE;
• measuring an amplitude of the TC signal as VTC;
• and
• determining a gain by dividing VTE with VTC.

A method of compensating a tracking error (TE) swing in a servo control system, comprising:

• providing an algorithm;
• providing a first circuit to generate a tracking error (TE) signal in accordance with the algorithm;
• generating a swing signal associated with the algorithm to represent a TE swing produced in generating the TE signal;
• providing a second circuit to generate a compensation signal (TC) to compensate the TE swing, the TC signal being K times in amplitude with respect to the TE swing, K being a coefficient;
• and
• determining the coefficient K by dividing a peak amplitude of the swing signal with a peak amplitude of the TC signal.

A method of compensating a tracking error (TE) swing in a servo control system, comprising:

• providing a photo-detector to detect a position of a laser spot;
• providing a set of photo-detector elements formed in the photo-detector to provide optical detection signals regarding the position of the laser spot;
• generating a tracking error (TE) signal in accordance with an algorithm;
• generating a compensation signal (TC) associated with the algorithm in a linear combination of peak (X) that represents an envelope peak amplitude value of an optical detection signal derived from one of the photo-detector elements X of the photo-detector;
• and
• generating a swing signal associated with the algorithm to represent a TE swing produced in generating the TE signal.