Current mode comparator based low voltage low power consumption CMOS (Complementary Metal Oxide Semiconductors) relaxation oscillator and method

Abstract

The invention discloses a current mode comparator based low voltage low power consumption CMOS (Complementary Metal Oxide Semiconductors) relaxation oscillator and a method. The oscillator comprises a current reference source, a current mode comparator, a current source load RS trigger. Compared with current mode comparator based relaxation oscillators in the prior art, the current mode comparator based low voltage low power consumption CMOS relaxation oscillator has the advantages of reducing the sensibility of the RS trigger turnover electric level along with variation of power voltage due to the current source load RS trigger; providing large flexibility for the design of an output square wave signal duty ratio due to a double-capacitor structure; being simple in circuit structure, enabling output oscillation square wave signals to be designed into arbitrary duty ratio and meanwhile overcoming the disadvantages that the traditional relaxation oscillators cannot work under low power voltage and are large in power consumption, sensitive in output frequency along with variation of power voltage and temperature and the like; being particularly suitable for application fields of implantation medical treatment devices, wireless sensor network nodes and the like which require low power voltage and low power consumption.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to an all-on-chip integrated CMOS relaxation oscillator with low voltage and low power consumption and an oscillation generation method. Background technique [0002] Clock sources are important building blocks in many electronic systems, with applications ranging from DC / DC converters and signal processing to carrier modulation in communication systems. It can be said that the quality of the clock source directly affects the overall performance of the electronic system, so the requirements for the clock source are getting higher and higher. [0003] At present, electronic systems generally use crystal oscillators as clock sources, which benefit from the high precision and high stability of crystal oscillators. However, because the crystal oscillator uses a quartz crystal, it is incompatible with standard CMOS integrated circuits, and the cost is high. In addition, the crystal os...

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Problems solved by technology

[0006] However, while the relaxation oscillator based on the current mode comparator can effectively reduce power consumption, at least there are defects such as the output frequency is greatly affected by the change of the power supply voltage, and the duty cycle of the output oscillation square wave signal cannot be adjusted.

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