MEMS sensor and starting circuit

Abstract

The invention provides an MEMS sensor and a starting circuit. The starting circuit is used for starting a band-gap reference core circuit and comprises an equivalent resistance generation unit and a state switching unit, wherein the equivalent resistance generation unit is composed of an equivalent transistor M1, and the equivalent transistor M1 comprises a plurality of equivalent field effect transistors connected in series; the state switching unit is electrically connected with the equivalent resistance unit and the band-gap reference core circuit; and the state switching unit is used for pulling up an internal node of the reference core circuit to force the internal node to be separated from a degenerate mode when detecting that the output voltage of the band-gap reference core circuitis 0, so that the band-gap reference core circuit can enter a normal working mode. According to the starting circuit, the equivalent transistor M1 is used for replacing a traditional resistor, so that the area of a chip can be smaller, and integration is facilitated, and when the band-gap reference core circuit is in a normal working mode, quiescent current is not consumed on the starting circuit, and the requirement for low power consumption is met.

Description

technical field [0001] The invention relates to the field of sensors, in particular to a MEMS sensor and a starting circuit. Background technique [0002] The domestic MEMS (Microelectro Mechanical Systems, microelectromechanical systems) sensor market is developing by leaps and bounds, especially in the mobile phone market. According to the survey data of the Mobile Phone Industry Research Institute, the overall shipment of mobile phones in the first half of 2019 reached 186 million Among them, high-end mobile phones contain more than 2 MEMS sensors on average, and the market size of single mobile phone sensors can reach 372 million. Mobile phones are basically powered by batteries, and different electronic products can be made into various shapes such as rectangles and cylinders, and multiple batteries can be connected in series and parallel. The power supply of the batteries is generally 3.0V, and when fully charged The voltage is 3.3V, and the voltage range for stopping...

AI Technical Summary

Problems solved by technology

[0005] In view of the shortcomings of the prior art described above, the object of the present invention is to provide a MEMS sensor and a start-up circuit, which is used to solve the problems that the start-up circuit of the core circuit in the prior art cannot meet the requirements of low area, low power efficiency, etc.

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