Device for realizing multi-mode clock reference source

Abstract

The invention discloses a device for realizing a multi-mode clock reference source. The device is composed of a controlled frequency generator, a high-quality factor multi-band frequency selection network, a multi-mode frequency divider, an automatic frequency calibration unit, and a digital signal to analog signal converter. Consists of five parts. The device can realize the clock reference source function of the multi-mode output frequency by setting its control bit. While the control bit selects the frequency division coefficient of the multi-mode frequency divider, the automatic frequency calibration unit generates a digital control bit, and controls the working state of the controlled frequency generator after a digital signal to analog signal converter. The output of the controlled frequency generator passes through the high-quality factor multi-band frequency selection network and is used as the input of the multi-mode frequency divider for frequency division, and then the frequency division output is sent to the automatic calibration unit again, and the calibrated clock output is the whole device The final output is used as a clock reference source for other electronic devices. The invention has the advantages of simple structure, high clock precision, easy realization, low cost and the like; it can replace the traditional clock reference source device and is widely used in electronic equipment requiring clock control.

Description

technical field [0001] The invention is a device for realizing a multi-mode clock reference source, which mainly provides accurate reference clocks for devices in various electronic fields such as communications, test instruments, and consumer electronic equipment. Background technique [0002] With the rapid development of modern communication, control and integrated circuit technology, high stability and high precision clock reference source has become one of the key components to determine the performance of various electronic systems. Especially in consumer electronic devices, continuous cost reduction has also become a direct driving force for technological development and breakthroughs. In the increasingly integrated electronic devices, the traditional clock reference source has become a bottleneck, and cannot meet the requirements of modern electronic equipment and devices in terms of manufacturing, packaging process, cost and technical performance. The technical rea...

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Problems solved by technology

[0003] Technical problem: Many traditional clock reference sources mainly used in electronic equipment and devices cannot be system integrated in the chip, and when the clock reference source is required to have a higher output frequency, it is necessary to use a frequency phase-locked loop circuit to achieve frequency multiplication function, thereby significantly increasing equipment cost

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