Oscillator

Abstract

The invention discloses an oscillator whose output signal frequency is adjustable with temperature. The oscillator includes a reference voltage generating circuit connected to a power supply voltage and ground, and outputs first, second and third reference voltages. The first reference voltage Greater than the second and third reference voltages; the reference current generation circuit connected to the reference voltage generation circuit generates a reference current proportional to the absolute temperature under the action of the first and third reference voltages; and the reference voltage generation circuit and the reference current The oscillating signal generating circuit connected to the generating circuit generates an oscillating signal under the action of the reference current and the first and second reference voltages. The whole circuit of the oscillator of the present invention does not use resistance, and the frequency of the output signal can be adjusted following the change of temperature.

Description

technical field [0001] The invention relates to an oscillator, in particular to an oscillator whose frequency is adjustable with temperature. Background technique [0002] In most digital system designs at present, the clock is an indispensable part, and an external active or passive oscillator is usually used to provide the clock signal. The advantage of providing a clock signal through an external oscillator is stable performance and easy design, but the disadvantage is that it will increase the layout area. In high-frequency design, the requirements for circuit wiring and processing are relatively strict, so using an external oscillator to provide a clock signal will undoubtedly increase system cost and design difficulty. [0003] At present, more and more designs are to implement the oscillator on-chip, and the oscillators suitable for on-chip generally include ring oscillators and RC oscillators. However, the frequency and power consumption of these two oscillators ar...

AI Technical Summary

Problems solved by technology

However, not only the frequency and power consumption of these two oscillators are greatly affected by the power supply voltage and process, but also the frequency will become lower as the oscillator temperature rises.

As a commonly used device, resistors not only fluctuate greatly due to the influence of the process, making the oscillator frequency unstable, but also use slightly larger resistors, which will increase the layout area and increase the cost of the chip

[0004] When the frequency of the oscillator does not slow down with the change of temperature, especially when the frequency is required to increase with the increase of temperature, the above two oscillators cannot be realized

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