Numerically controlled ring oscillator and its control method and device

Abstract

The invention discloses a numerically controlled ring oscillator and a control method and device thereof. The numerically controlled ring oscillator comprises a high-order numerically controlled oscillator; and a low-order numerically controlled oscillator of which the input end is connected with the output end of the high-order numerically controlled oscillator and the output end is connected with the input end of the high-order numerically controlled oscillator and the output end of the numerically controlled ring oscillator, wherein the control code of the high-order numerically controlled oscillator is a high-order control code, and the control code of the low-order numerically controlled oscillator is a low-order control code. The technical problems of limitation of the output frequency accuracy and the output frequency range of the numerically controlled ring oscillator in the prior art can be solved.

Description

technical field [0001] The invention relates to the field of clock signal generation, in particular to a numerically controlled ring oscillator and a control method and device thereof. Background technique [0002] The clock is an integral part of the circuit system. The traditional clock source - crystal oscillator, has always been recognized as the best clock generator because of its excellent performance. However, with the continuous development of integrated circuits, crystal oscillators have also shown their own limitations. It has high power consumption, large area, and cannot be integrated, which are contrary to the development trend of today's integrated circuits. Therefore, researchers began to pay attention to the research of low-power and integrated on-chip clocks. Common on-chip clocks are divided into two types: analog and digital. The analog clock has high precision, but it also often has the disadvantages of high power consumption and large area. Moreover...

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Problems solved by technology

At the same time, the parasitic resistance and parasitic capacitance generated by the layout and wiring of the layout also increase the delay of the numerical control ring oscillator compared with the theory, while the delay caused by the multiplexer and parasitic resistance and capacitance is affected by the process and power supply voltage. , temperature is strictly affected, and will always exist in the circuit, which seriously limits the output frequency accuracy and frequency range of the numerically controlled ring oscillator

[0004] Aiming at the problem of limited output frequency accuracy and output frequency range of the digitally controlled ring oscillator in the prior art, no effective solution has been proposed yet

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