Burr detection circuit with temperature and process compensation functions

Abstract

The invention discloses a burr detection circuit with temperature and process compensation functions. The compensation voltage generated by a temperature process compensation voltage generation circuit and output by a bias current generation circuit is connected with the input end of a first low-pass filter circuit, the output end of a high-pass filter circuit and the source electrode of a fourthPMOS tube, and the bias current generated by the temperature process compensation voltage generation circuit and output by the bias current generation circuit is connected with the drain electrodes ofthe third PMOS tube and the fourth PMOS tube and serves as an output signal; the output end of the first low-pass filter circuit is connected with the source electrode of the third PMOS tube, the grid electrode of the third PMOS tube is connected with the input end of the power supply VDD and the input end of the second low-pass filter circuit; the source electrode of the fourth PMOS tube is further connected with the high-pass filter circuit, the high-pass filter circuit is connected with the power supply VDD, and the grid electrode of the fourth PMOS tube is connected with the second low-pass filter circuit. The device is simple in circuit structure and stable and reliable in work, the temperature and process deviation can be well compensated, and the application range is wide.

Description

technical field [0001] The invention relates to the field of integrated circuits, in particular to a burr detection circuit with temperature and process compensation functions. Background technique [0002] In the case of large glitches in the power supply, the logic system is prone to wrong timing or flipping, and enters an abnormal working state, resulting in internal data errors, operation errors, or abnormal reading errors of memory contents, resulting in internal information leakage. The power glitch detection circuit generates an alarm signal when a glitch signal is detected, which can effectively prevent errors and ensure system safety. [0003] Smart cards are widely used in various fields. Smart cards in high-security fields such as identity authentication and finance have higher requirements for attack defense capabilities. In security attacks against smart cards, fault injection attacks based on power glitches have been widely used. In this kind of attack, the at...

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Problems solved by technology

[0006] These circuits have fast response speed, simple structure, and low power consumption, but the detection point accuracy is not high, and the detection point will change with the change of temperature and process angle.

In the patent CN104714193A, the designed temperature and process angle compensation module can improve the accuracy of the detection point. The circuit obtains reference voltages VDDIN1 and VDDIN2 from the temperature and process compensation branch through the RC low-pass filter circuit, and then realizes positive For negative glitch detection, the positive glitch detection threshold voltage is VTHP+R2 / (R1+R2+R3)×(VDD-2VGSP), and the negative glitch detection threshold voltage is VTHP+R3 / (R1+R2+R3)× (VDD-2VGSP), it can be seen from the formula that the circuit has a certain compensation effect on temperature and process deviation, but the compensation effect is not good

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