Puf-based magnetometer with safety protection circuit

A PUF-based magnetometer with a safety protection circuit, comprising:

• a TMR magnetometer main structure, wherein the TMR magnetometer main structure comprises n*n TMR sensors, n is an integer greater than or equal to 2, and the n*n TMR sensors are arranged in n rows and n columns to form a TMR sensor array;
• wherein each TMR sensor of the n*n TMR sensors has a power terminal, a first control terminal, a second control terminal and an output terminal;
• wherein
• when valid signals are input to the first control terminal and the second control terminal of a TMR sensor of the n*n TMR sensors, the TMR sensor is enabled, and the output terminal of the TRM sensor outputs data;
• otherwise, the TMR sensor is disabled, and the output terminal of the TRM sensor does not output data;
• in the TMR sensor array, a working voltage is accessed to the power terminals of the n*n TMR sensors, first control terminals of n TMR sensors in a jth row are connected and a connecting terminal is a jth row selection terminal of the TRM sensor array, wherein second control terminals of n TMR sensors in a jth column are connected and a connecting terminal is a jth column selection terminal of the TRM sensor array, output terminals of the n TMR sensors in the jth column are connected and a connecting terminal is a jth output terminal of the TRM sensor array, and j=1, 2, . . . , and n;
• wherein the magnetometer further comprises:
• a control circuit, configured to generate a row selection signal and a column selection signal, and configured to send the row selection signal to a row encoder circuit and the column selection signal to a column encoder circuit;
• the row encoder circuit, configured to generate and output a corresponding row position signal according to the row selection signal, wherein the row position signal is n-bit binary data comprising two bits of valid data and (n−2) bits of invalid data;
• the column encoder circuit, configured to generate and output a corresponding column position signal according to the column selection signal, wherein the column position signal is n-bit binary data comprising two bits of valid data and (n−2) bits of invalid data;
• wherein a jth bit of data of the row position signal is input to the jth row selection terminal of the TMR sensor array, and a jth bit of data of the column position signal is input to the jth column selection terminal of the TMR sensor array;
• wherein when the row position signal and the column position signal are input to the TMR sensor array, the two bits of valid data in the row position signal correspond to two valid rows, the two bits of valid data in the column position signal correspond to two valid columns, wherein the two valid rows are in one-to-one correspondence with the two valid columns, and each valid row and the corresponding valid column form a valid row-column position, such that two valid row-column positions are obtained;
• at this moment, one bit of valid data, namely a valid signal, is input to each of the first control terminal and the second control terminal of the two TMR sensors at the two valid row-column positions in the TMR sensor array, the two TMR sensors are enabled, the output terminals of the two TMR sensors output data, and the output terminals of the other TMR sensors do not output data;
• a multiplexer, having n input terminals and two output terminals, wherein the n input terminals of the multiplexer are connected to the first output terminal to the nth output terminal of the TMR sensor array in a one-to-one corresponding manner, and the multiplexer is configured to correspondingly output data output by the output terminals of the two enabled TMR sensors in the TMR sensor array through the two output terminals;
• and
• a dynamic comparator, having a positive input terminal, a reverse input terminal and an output terminal, wherein the positive input terminal and the reverse input terminal of the dynamic comparator are connected to the two output terminals of the multiplexer in a one-to-one corresponding manner, and the dynamic comparator is configured to compare data input to the positive input terminal and data input to the reverse input terminal to generate a corresponding PUF response signal and output the PUF signal through the output terminal.