Resistance detection device and method

Abstract

The application discloses a resistance detection device and method. The resistance detection device includes: a resistance detector, which converts the reference voltage into a comparison current based on the switched capacitor module, and converts the reference voltage into a test current based on the resistance to be measured, and the equivalent resistance value of the switched capacitor module is controlled by adjusting the clock signal frequency; an oscillator for generating a comparison clock signal according to the comparison current, and a test clock signal for generating a test clock signal according to the test current; and a processor for obtaining a detection coefficient according to a ratio between the frequency of the comparison clock signal and the frequency of the test clock signal, the detection coefficient indicating the The ratio of the resistance value of the resistor to the equivalent resistance value of the switched capacitor block. The resistance detecting device adopts a switched capacitor module as a precise resistor, which reduces cost and improves practicability, and the equivalent resistance value of the switched capacitor module is easy to control, further improving practicability and detection accuracy.

Description

technical field [0001] The present invention relates to the technical field of integrated circuits, and more specifically, to a resistance detection device and method. Background technique [0002] In the chip manufacturing process, the resistance value of the on-chip (on-chip) resistor manufactured by the integrated circuit manufacturing process varies greatly with the process, and it is usually difficult to directly produce an on-chip resistor with an accurate resistance value, so it is necessary to additionally check the on-chip resistor. Resistance testing and calibration. [0003] In the traditional on-chip resistance detection method, it is usually necessary to provide a precise resistance outside the chip (off-chip) with on-chip resistance as a reference, for example, connect the on-chip resistance and the precision resistance in parallel, and compare the voltage drop of the on-chip resistance with the external precision resistance Compare the voltage drop, or divide...

AI Technical Summary

Problems solved by technology

[0004] However, the traditional detection methods are based on the fact that the printed circuit board (PCB) can provide accurate resistance, and the external accurate resistance is not conducive to reducing the cost and will limit the application

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