Tracking error signal generation circuit

Abstract

The invention provides a tracking error signal generation circuit, comprising a digital circuit, a short signal removal circuit and a phase comparison circuit; the digital circuit receives a first pickup signal and a second pickup signal output by an optical reading head and respectively compares the first pickup signal and the second pickup signal with a reference voltage so as to obtain a first digital signal and a second digital signal. The short signal removal circuit is used for removing pulses in the first digital signal and the second digital signal, which are less than a prearranged time; the pulse is further taken as a first judging signal and a second judging signal. The phase comparison circuit receives the first judging signal and the second judging signal; the tracking error signal is output according to the phase difference of the first judging signal and the second judging signal.

Description

technical field [0001] The present invention relates to a disc-shaped storage medium positioning technology, and in particular to a tracking error signal generation circuit. Background technique [0002] Optical storage media, such as CDs and DVDs, has gradually replaced traditional magnetic storage media and has become a modern One of the indispensable storage media. Due to the rapid development of optical technology in recent years, the capacity of optical storage media is getting higher and higher. Correspondingly, the number of tracks of optical storage media is also increasing. Therefore, the track positioning technology of optical storage media is becoming more and more important. [0003] figure 1 is a schematic diagram of an existing track-following method. Please refer to figure 1 , where the position marked 11 represents the position of the optical pickup head (Pick-Up Head) of the optical disk drive. The irradiation area of ​​the optical pick-up head 11 on ...

AI Technical Summary

Problems solved by technology

However, the above method of improving the tracking error signal does not mention improving or simplifying the equalizer

Since the equalizer and its pre-amplifier analog circuits occupy a lot of the layout area of ​​the integrated circuit, the layout area of ​​the integrated circuit will need to be large, which means that the cost of the product will inevitably increase, and the product competitiveness will also decline.

Images