Circuit and method for improving sensing accuracy

A processing circuit for improving a sensing accuracy, comprising:

• a delay circuit, for outputting a delayed signal according to a first path delay coefficient;
• a control circuit, for determining a clock phase sampling time according to a second path delay coefficient and outputting a controlled signal according to the clock phase sampling time;
• a transforming circuit, coupled to the control circuit, for transforming the controlled signal to a transformed signal;
• a mixing circuit, coupled to the delay circuit and the transforming circuit, for mixing the delayed signal and the transformed signal, to generate a mixed signal;
• a removing circuit, coupled to the mixing circuit, for removing a direct current (DC) component of the mixed signal, to generate a removed signal;
• a computing circuit, coupled to the delay circuit, the control circuit and the removing circuit, for computing the first path delay coefficient, the second path delay coefficient and a signal power according to the removed signal;
• an amplifying circuit, coupled to the removing circuit and the computing circuit, for amplifying an amplitude of the removed signal according to the signal power, to generate an amplified signal;
• and
• a combining circuit, coupled to the amplifying circuit, for combining a plurality of chirps in the amplified signal, to generate a combined signal.