Compensating circuit and compensating method

Abstract

A compensation circuit includes: a matching circuit for matching an initial signal and a conversion signal to generate a matching signal; a calculation circuit coupled to the matching circuit for calculating a function of the matching signal; a phase rotation circuit coupled to the calculation circuit for rotating a phase of the function according to a determined phase to generate a phase rotation function; a determination circuit coupled to the phase rotation circuit for determining a parameter according to the phase rotation function; and a mixing circuit coupled to the determination circuit for mixing the parameter and the conversion signal to generate a compensation signal.

Claims

1. A compensation circuit for compensating in-phase quadrature (IQ) phase difference of a sensing device, the compensation circuit comprising: a matching circuit for matching an initial signal and a transition signal to generate a matching signal; a calculation circuit coupled to the matching circuit for calculating a function of the matching signal; a phase rotation circuit coupled to the calculation circuit for rotating a phase of the function according to a determined phase to generate a phase rotation function; a determination circuit coupled to the phase rotation circuit for determining a parameter according to the phase rotation function; and a mixing circuit coupled to the determination circuit for mixing the parameter and the transition signal to generate a compensation signal.

2. The compensation circuit as claimed in claim 1, wherein the step of matching the initial signal and the conversion signal to generate the matching signal comprises: generating a coefficient based on the initial signal; and mixing the coefficient and the conversion signal to generate the matching signal.

3. The compensation circuit as described in claim 1, wherein the initial signal includes a linear frequency conversion (chirp) signal.

4. The compensation circuit as described in claim 1, wherein the function is an average value of the matching signal.

5. The compensation circuit as described in claim 4, wherein the computational circuit calculates the average value of the matched signal through an inverse Fourier transform (IFT).

6. The compensation circuit as claimed in claim 1, wherein the step of determining the parameter according to the phase rotation function comprises: determining the parameter to be a first value in response to the phase rotation function being greater than a threshold; and determining the parameter to be a second value in response to the phase rotation function being less than the threshold.

7. The compensation circuit as claimed in claim 6, wherein the first value is a positive number and the second value is a negative number.

8. The compensation circuit as claimed in claim 1, further comprising: a phase estimation circuit coupled to the phase rotation circuit, for estimating a phase of the phase rotation circuit according to the phase rotation function, so as to generate an estimated phase.

9. A compensation method for compensating in-phase quadrature (IQ) phase difference of a sensing device, the compensation method comprising: matching an initial signal and a conversion signal to generate a matched signal; calculating a function of the matched signal; rotating a phase of the function according to a determined phase to generate a phase rotation function; determining a parameter according to the phase rotation function; and mixing the parameter and the conversion signal to generate a compensation signal.

10. The compensation method as described in claim 9, wherein the step of determining the parameter based on the phase rotation function comprises: determining the parameter to be a first value in response to the phase rotation function being greater than a threshold; and determining the parameter to be a second value in response to the phase rotation function being less than the threshold.

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