Ultra Low Power Oscillator

Abstract

The invention provides an ultra-low power consumption oscillator, which includes a capacitor, a first, a second, a third and a fourth field effect transistor, and an inverter. One end of the capacitor is connected to the first power supply end, and the other end serves as a signal oscillation end and is connected to the substrate of the second field effect transistor. The gate, drain and source of the second transistor are connected to the second power terminal, the source and substrate of the first transistor are connected to the first power terminal, the drain is connected to the signal oscillation terminal, the source and the source of the fourth transistor are connected to the first power terminal. The substrate is connected to the first power supply end, the gate is connected to the signal oscillation end, the drain is connected to the input end of the inverter and the substrate of the third field effect transistor, and the gate, drain and source of the third transistor are connected to The second power supply terminal is connected, and the output terminal of the inverter is connected with the gate of the first transistor. In this way, its static power consumption is mainly generated by the leakage current of the second and third transistors. Each leakage branch current can be designed to be very small, and an oscillator with very low total power consumption can be easily designed.

Description

【Technical field】 [0001] The invention relates to the field of circuit design, in particular to an ultra-low power consumption oscillator. 【Background technique】 [0002] Chinese patent 200810112605.4 filed on May 26, 2008 discloses a low-voltage low-power oscillator, which has the advantages of low operating power supply voltage, low power consumption, and high precision. But only suitable for lower power consumption designs, such as current consumption above 200nA. However, with the development of technology, the demand for lower power consumption is becoming stronger and stronger. For example, in Bluetooth 4.0, medical and other fields, the battery needs to be replaced once, and the longer the service time, the better. Some products even hope that they do not need to replace the battery during the entire product life cycle, or some energy harvesting circuits do not have batteries, relying on the absorption of environmental Weak energy produces weak electric energy to su...

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Problems solved by technology

If the minimum width of the resistor is L=1u and the spacing is 1um, an area of ​​2umX1000000um=1.4mmX1.4mm is required, which is too expensive

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