Ring oscillator circuit with own temperature and process corner calibration

Abstract

The invention discloses a ring oscillator with own temperature and process corner calibration. A temperature detection circuit and a process corner detection circuit are added on the basis of the traditional ring oscillator circuit, and an analogue phase inverter circuit used in the traditional ring oscillator is improved; the new structure can automatically detect the change of the temperature and the process corner, and feed back the change of the temperature and the process corner to a voltage bias terminal of an analogue phase inverter, thereby calibrating the working frequency of the ring oscillator.

Description

technical field [0001] The invention relates to the field of mixed signals and analog integrated circuits, in particular to a ring oscillator circuit with temperature and process angle calibration. Background technique [0002] The ring oscillator is an important module of analog radio frequency integrated circuits, and is widely used in phase-locked loops and FPGAs. Because the chip area occupied by the ring oscillator is small, the design is simple and easy to integrate, and the power consumption is low, the ring oscillator is widely used in SOC chips and data storage chips to generate clock signals. [0003] Traditional ring oscillators such as figure 1 As shown, it is generally composed of three or four stages of analog inverters cascaded, and the phase difference between the inverters is used to form positive feedback to generate oscillation. The traditional ring oscillator has a simple structure, often adopts a voltage bias circuit with a single structure, and uses v...

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Problems solved by technology

[0004] Although the structure of the traditional ring oscillator is simple and easy to integrate, because the bias of the traditional ring oscillator is too simple, only an external voltage is roughly used to control the frequency of the ring oscillator, and the external voltage is fixed, resulting in temperature changes and When the process angle changes, the output frequency of the ring oscillator fluctuates greatly

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