Ring oscillator with low power consumption and low temperature coefficient

Abstract

Oscillators are widely used for integration circuits needing internal clocks, such as various switching circuits and digital circuits. In the design of a low-power-consumption integration circuit, power consumption of an oscillator is an important index for balancing quality of the oscillator, the temperature coefficient of an output clock of the oscillator determines deviation of frequency of the oscillator along with changes of temperature, and a lower temperature coefficient benefits improvement of stability of a system; in the design of a common oscillator with a low temperature coefficient, a temperature detection circuit is adopted, the circuit is adjusted according to the detected temperature, and accordingly the aim of reducing the temperature coefficient of the oscillator is achieved, but the temperature detection circuit needs to be additionally arranged in the structure, and accordingly power consumption and the area of the oscillator are increased. To solve the preceding problems, the invention discloses a ring oscillator with a low temperature coefficient under a lower power consumption condition. Circuits of the ring oscillator include a ring oscillation circuit and a bias circuit.

Description

technical field [0001] The invention belongs to the field of integrated circuit design, and is used for clock generation in analog / digital-analog hybrid integrated circuits, especially low-power integrated circuits; specifically designs a new oscillator whose bias current temperature coefficient and inverter flipping level The structure of mutual compensation of temperature coefficients can obtain a clock with a lower temperature coefficient only under the condition of adding a few devices to the traditional circuit. Background technique [0002] In some circuits, the clock signal is the prerequisite for the normal operation of the circuit, and the clock signal with low temperature coefficient is conducive to the stability of the circuit performance; in many integrated clock circuits, the RC delay ring oscillator has low power consumption and low cost. Advantages are widely used. [0003] figure 1 It is a basic low-power ring oscillator with a high power supply rejection r...

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Problems solved by technology

[0007] It can be seen from [Equ.1], [Equ.2], [Equ.3] that there is no power supply term in the expression, so the clock generated by the oscillator has a better power supply rejection ratio; but [Equ.1 ] The mobility μ of the NMOS tube in n and threshold voltage V TH are variables with high temperature coefficients, making the flipping level V of the inverter sw has a high temperature coefficient, so this oscillator has a high temperature coefficient

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