Digital television modulator chip synchronization frequency division clock production devices and method

Abstract

The invention provides a device and a method for generating a synchronous frequency dividing clock in the chip of a digital TV modulator. The invention is used in the chip of the modulator for the multimedia broadcasting base band of a GB20600 ground digital TV and able to divide the main frequency clock signal exponentially. The device includes a main frequency clock signal input end, a testing and enabling signal input end, three basic frequency dividing units in serial connection and three selectors, and, in particular, two flip-latches. The device and the method divide the main frequency clock signal into 2, 4 and 8 sections using a register and an inverter, and meanwhile flip-latching the signal of divided frequency using the main frequency clock signal; the obtained signal of divided frequency becomes the final clock signal of divided frequency after passing through the selector. The invention has the main advantage that each clock signal of divided frequency can be averaged according to the delay in passing the main frequency clock signal so as to reduce the deflection of the synchronous clock signal, thus reducing the deflection of the clock of the whole integrated circuit chip and improving the frequency and performance of the chip.

Description

technical field [0001] The invention belongs to the field of integrated circuit design, and relates to the field of digital integrated circuits. Specifically, it relates to a device and a method for generating a synchronous frequency-division clock in the chip design of a baseband modulator for terrestrial digital TV multimedia broadcasting according to the national standard GB20600. Background technique [0002] As another leap forward of the TV industry, digital TV integrates the world's most advanced image coding processing technology, digital processing technology and digital communication technology, and is one of the focuses of technological competition in the world today. The national standard for terrestrial digital TV GB20600-2006 "Digital TV Terrestrial Broadcasting Transmission System Frame Structure, Channel Coding and Modulation" has been officially promulgated, but there is no baseband modulator chip that fully complies with the national standard GB20600 for ter...

AI Technical Summary

Problems solved by technology

[0014] The present invention aims at the problem that the existing synchronous frequency-division clock generation device and its method in digital integrated circuit design will increase the delay of the internal synchronous clock in the chip, and provides an improved baseband for national standard GB20600 terrestrial digital TV multimedia broadcasting Device and method for generating synchronous frequency division clock in modulator chip design, the device and method can reduce the skew of the internal clock signal of the chip and improve the operating frequency of the chip

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