Multiple precision clock generating circuit on single chip and its realizing method

Abstract

The generation circuit includes following parts: clock signal source in high precision in use for generating clock signal; frequency divider is in use for receiving the said clock signal, and outputting a standard time clock to a comparator; inner oscillator in use for generating an internal clock and outputting to the comparator; the comparator is in use for carrying out comparison between the standard time clock and the internal clock, and if deviation exists, then signal is output to a frequency control register; the frequency control register is in use for setting up frequency of the inner oscillator. Through the clock signal source in high precision, the invention makes the clock circuit generate clock signal with multiple corresponding frequencies based on requirements of functions and power consumptions of chip host so that least number of peripheral electron device, and minimal cost of manufacturing circuit board are reached.

Description

technical field [0001] The invention relates to an integrated circuit, in particular to a multiple accurate clock generation circuit on a single chip and a realization method thereof. Background technique [0002] In recent years, with the continuous improvement of integrated circuit technology, more and more systems have been integrated on the chip. The pace of electronic products without peripheral devices and low cost is also getting faster and faster. Flexible and accurate clock circuits play an important role in the overall power consumption of today's single-chip wireless communication chips. [0003] In an existing single-chip communication system with multiple clock circuits, various precise clocks are generated through multiple clock generation circuits. It usually adopts the following two solutions: [0004] One solution is to use multiple crystal oscillator circuits on chip to generate precise clocks. This requires connecting a plurality of oscillating crystal...

AI Technical Summary

Problems solved by technology

All of these put forward higher requirements for the application of the chip, which not only increases the application cost of the chip, but also limits the application field of the chip.

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