Wide-temperature-range automatic temperature compensation oscillator

Abstract

The invention discloses a wide-temperature-range automatic temperature compensation oscillator, and relates to the technical field of integrated circuits. The oscillator comprises a temperature detection module, a selection module and a clock generation module with temperature compensation. The temperature detection module outputs a detection result by comparing the input voltage with the reference voltage; the temperature detection module sends a detection result to the selection module, and the selection module judges the temperature range of the circuit according to the detection result soas to output a control signal to the clock generation module with temperature compensation; and the clock generation module with temperature compensation is connected with a corresponding temperaturecompensation scheme according to the control signal so as to output a clock signal after temperature compensation. According to the technical scheme, the current environment temperature is detected through the temperature detection module, the selection module judges the current environment temperature of the circuit, the corresponding temperature compensation structure is selected to be connectedaccording to the current environment temperature, and therefore the high-precision oscillator with the wide temperature range and the automatic temperature compensation function is achieved.

Description

technical field [0001] The invention relates to the technical field of integrated circuits, in particular to an oscillator with wide temperature range and automatic temperature compensation. Background technique [0002] At present, most of the low-power and small-area clock generation circuits integrated on the chip are resistor-capacitor oscillators (RCOSC), but due to the temperature coefficient of the resistor, the output clock varies greatly with temperature. To solve this problem, a common optimization solution is to combine two kinds of resistors with opposite temperature coefficients, so that the total resistance changes with temperature as small as possible after the combination, so as to improve the problem that the output clock frequency changes too much with temperature. [0003] However, with the continuous advancement of technology, this compensation scheme gradually cannot meet the requirements of practical applications. Because the combination of two resisto...

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Problems solved by technology

[0003] However, with the continuous advancement of technology, this compensation scheme gradually cannot meet the requirements of practical applications.

Because the combination of two resistors with opposite temperature coefficients can generally only be realized in a narrow temperature range (such as 0°C to 85°C), the resistance value changes little with temperature, and in the full temperature (-40°C to 125°C) In the low temperature range and high temperature range, the resistance value still varies greatly with temperature, which means that the traditional compensation scheme cannot achieve the low temperature coefficient of the output clock frequency in the full temperature range (-40°C ~ 125°C).

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