Abstract: A time domain integrated temperature sensor described by the present invention adopts a shaped clock signal to control the charging time of capacitors, so that the capacitors generate charging time delay signals related to the cycle of an input clock, and a pulse signal related to pulse width, temperature and the cycle of the input clock is generated through logical XOR (Exclusive OR) operation on a time delay signal generated when the capacitors are charged by one way of PTAT (Proportional To Absolute Temperature) current in an above control manner and a time delay signal generated when the capacitors are charged by one way of CTAT (Complementary To Absolute Temperature) current in the same manner; then, the same input clock signal is adopted for quantifying the pulse width of the pulse signal, the relevance of the obtained quantization result and the cycle of the input clock is completely offset, namely, an output value of the temperature sensor is unrelated to the input clock signal, thereby solving the pr

Abstract: In the present invention, by connecting a band-gap reference voltage module unit to a threshold unit of a limiter circuit, the ON-voltage of the threshold unit can be dynamically and continuously controlled; and the output voltage value of the band-gap reference voltage module unit can be arbitrarily set as needed for operating the circuit. When a voltage of the antenna terminal is higher than the sum of this band-gap reference voltage value and the respective threshold voltage of the serial MOS transistors, the threshold unit is turned ON to switch on a grounded path, so that charge at the antenna is output to the ground; in this way, the amount of charge at the antenna terminal is reduced and the rectified DC voltage is thus reduced. When the voltage at the antenna terminal is lower than the sum of this band-gap reference voltage value and the respective threshold voltage of the serial MOS transistors, the threshold unit is turned off to switch off the grounded path.

Abstract: The present invention relates to the technical field of radio frequency identification, in particular to a rectifier and limiter circuit having a plurality of time constants and a passive radio frequency tag containing this rectifier and limiter circuit. By applying analog control signals with different time constants to control terminals of two discharge paths of the rectifier and limiter circuit, respectively, i.e., adjusting the voltage amplitude at different switching speeds, switching the two discharge paths from a completely open state to a completely closed state is realized. Discharging is performed properly according to the amount of charge at antenna terminals and the level of energy of the tag, thus to improve the demodulation capacity of the tag and increase the read-write distance of the tag.

Abstract: The present invention relates to the field of radio frequency, and provides a band-gap reference self-starting circuit and a passive radio frequency identification tag. The self-starting circuit comprises: a first switch device unit, configured to generate a first leakage current in an off state; a second switch device unit, configured to generate a second leakage current lower than the first leakage current in the off state, and generate a control voltage according to the first leakage current and the second leakage current; a control unit, configured to generate a starting control signal according to the control voltage; and a band-gap reference generating unit, configured to generate a reference voltage according to the starting control signal, and control the second switch device unit to enter dormancy using the reference voltage.

Abstract: A radio frequency identification (RFID) tag and a low dropout regulator (LDO) circuit consuming ultra-low power.

Abstract: The present invention relates to the field of radio frequency identification, in particular to a temperature measurement and calibration circuit and a passive radio frequency identification tag. Meanwhile, the present invention further relates to a method for performing temperature measurement by using the tag. The temperature measurement and calibration circuit of the tag generates an upper reference voltage value limit and a lower reference voltage value limit, which do not change with temperature, then calibrates the upper reference voltage value limit and the lower reference voltage value limit to a uniform upper voltage value limit and a uniform lower voltage value limit, and eliminates the problem of different reference voltages of tags due to the power supply voltage fluctuation and process deviation. Meanwhile, a temperature measurement voltage generator circuit of the tag generates a calibration voltage value under a uniform calibration temperature.

Abstract: The present invention relates to the field of radio frequency, and provides a band-gap reference self-starting circuit and a passive radio frequency identification tag. The self-starting circuit comprises: a first switch device unit, configured to generate a first leakage current in an off state; a second switch device unit, configured to generate a second leakage current lower than the first leakage current in the off state, and generate a control voltage according to the first leakage current and the second leakage current; a control unit, configured to generate a starting control signal according to the control voltage; and a band-gap reference generating unit, configured to generate a reference voltage according to the starting control signal, and control the second switch device unit to enter dormancy using the reference voltage.