An on-chip reference clock generation circuit and method

Abstract

The invention discloses an on-chip reference clock generating circuit and a method thereof. The on-chip reference clock generating circuit includes a fully differential ring oscillation circuit (10) formed by cascading a plurality of delay units, respectively connected to each delay unit A temperature compensation circuit (20), a comparator (30) connected to the two output terminals of the last-stage delay unit, and a delay phase-locked loop (40) connected to the output terminals of the comparator (30). The beneficial effect of implementing the present invention is that the on-chip integration of the oscillating circuit is realized by adopting the method of temperature compensation, and combined with the low-pass filtering characteristics of the delay phase-locked loop for phase jitter, under the condition of relatively low complexity, a complete On-chip integrated, highly stable on-chip reference clock generation circuit.

Description

technical field [0001] The invention relates to an on-chip reference clock generation circuit and method capable of realizing high stability, full integration and low-cost on-chip reference clock signal. Background technique [0002] For most system-on-chip designs, the oscillator circuit is an essential component that provides the clock for the chip. In wireless radio frequency communication systems, the stability of the reference clock determines the accuracy of frequency synthesis and affects the accuracy of data transmission and processing. In a digital system, the stable and reliable operation of the system also depends heavily on the stability of the clock. There are currently two main ways to provide a reference clock for the system: crystal and oscillator circuit. [0003] Crystals can be divided into active crystals and passive crystals. Among them, the oscillation frequency of active crystals has extremely high stability with changes in temperature, process and p...

AI Technical Summary

Problems solved by technology

However, in the standard CMOS process widely used at present, it is still facing many challenges to realize a highly stable on-chip reference clock generation circuit under the conditions of process, power supply voltage and temperature variation.

In view of the above problems, the on-chip oscillator based on the RC self-calibration method is mainly used at present, but this method requires discrete resistors and capacitors with small temperature coefficients outside the chip, and the use of discrete devices is not conducive to the improvement and reduction of integration. cost, and the additional calibration circuit takes up a large chip area

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