System for detecting signal dither and its correcting method

Abstract

The system is utilized to detect the time interval between the upper edge, the lower edge of the high-speed data stream read out by the optical drive and the referent pulse (so called signal dithering). The radio frequency signal read out by the optical head is near the central standard position of the analog radio frequency signal. It is the approximate the proportional relation between the amplitude variation and the image variation. The dithering value is calculated out by equalizing the difference of the voltage to the difference of the time.

Description

technical field [0001] The invention belongs to a system for detecting signal jitter and a correction method thereof, which are applied to detecting the signal jitter of a data stream of a high-speed digital system, and in particular relates to a device for detecting signal jitter using a voltage difference into a time difference and method. Background technique [0002] In the past few years, "jitter" has become a signal characteristic that many engineers attach great importance to, because in high-speed digital systems, the "rise times" of the signal have changed. As the system's operating speed increases by one megabit per second (Mbps), a slight change in the rising or falling edge of a signal will have a bigger impact. The "skew" (skew) or "phase error" (data jitter) of the signal waveform not only affects the "integrity" (integrity) of the data and the "setup time" and "hold time" of the signal voltage ( hold time), it will also make it more difficult for the system ...

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Problems solved by technology

[0005] However, for high-speed optical drive data streams, the frequency of the data stream is already quite high. The pulse counting method requires a higher-speed counting pulse to detect signal jitter, and the resolution of signal jitter is limited by the counting pulse. Frequency of

The fast integration method also requires a large bandwidth and is easily affected by circuit saturation or drift

Therefore, for the adjustment of the servo system of high-speed optical drives, the third detection method is generally adopted, and the signal jitter is directly observed by the oscilloscope, but the signal jitter cannot be quantified only by the naked eye, and the servo system adjustment control cannot be provided in real time. Parameter reference

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