Digital phase detector

Abstract

The invention relates to a clock in a digital circuit, and discloses a digital phase detector, so that the phase detection accuracy can be improved under the same frequency phase detection clock. This digital phase detector includes: a delay module, which is used to generate a plurality of phase detection clock signals with different phases according to a phase detection clock signal; The phase detection clock signals of the phases are counted separately, and the total phase detection count value is saved for external use.

Description

technical field [0001] The invention relates to clocks in digital circuits, in particular to clock phase locking in digital circuits. Background technique [0002] The clock is a key component of any sequential digital circuit, especially for communication equipment, automatic control systems, and computer hardware with high timing and frequency requirements, it is a key factor that affects communication quality, control accuracy, and computing efficiency. The quality of the clock directly affects the performance of a single board or even the entire system. The local clock source of ordinary digital circuits can be used as a clock generation device, and the synchronous clock source circuit is generally realized by a dedicated phase-locked loop device. For systems with special clock applications, such as digital synchronous network equipment, the phase detector of the clock is used as the phase detector, and the phase detector still needs to be designed by technicians accord...

AI Technical Summary

Problems solved by technology

[0010] In practical applications, the above scheme has the following problems: the phase detection accuracy is directly limited by the frequency of the phase detection clock, which cannot be higher than the phase detection clock cycle

In addition, the maximum frequency that general circuits can withstand is limited. For example, some components in the circuit can only be used below certain frequencies. The drop doesn't even work

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