Temperature detection circuit with adjustable temperature measurement range and passive sensing tag

The invention discloses a temperature detection circuit with an adjustable temperature measurement range and a passive sensing tag, and the temperature detection circuit comprises a reference circuit which is used for providing a reference current and a reference voltage; the VBE voltage generation circuit is used for generating reference voltage related to temperature; the amplifying circuit is used for comparing and amplifying the reference voltage and the reference voltage and generating an amplified voltage signal; the first voltage-controlled oscillator is used for converting the amplified voltage signal into a periodic signal; the frequency divider is used for performing frequency division processing on the periodic signal to obtain an enable signal; the second voltage-controlled oscillator is used for generating a clock signal; and the counter is used for counting the clock signal according to the enable signal and outputting a temperature value. The temperature coefficient is linearly amplified by add