Temperature sensor using delay circuit

A temperature sensor, comprising:

• a first signal delaying apparatus configured to receive a step signal, perform a phase delay operation on the received step signal according to a temperature degree, and thereby forming a first output signal;
• a comparison apparatus having a first input terminal, a second input terminal and a first output terminal, wherein the first input terminal is configured to receive the first output signal, the second input terminal is configured to receive the step signal, the first output terminal is configured to output a second output signal;
• a multiplier having a third input terminal, a fourth input terminal and a second output terminal, wherein the third input terminal is configured to receive the second output signal, the fourth input terminal is configured to receive a first clock signal, the second output terminal is configured to output a third output signal;
• and
• a counting apparatus configured to receive the third output signal, count the number of pulses of the third output signal, and generate a digital code accordingly.