| 摘要 |
A quadrature signal generation system which has a pair of input terminals for receiving a first A.C. signal and a second A.C. signal. The first A.C. signal and the second A.C. signal have a predetermined frequency and a phase relation of approximate 90° with each other. The system also has a multiplier circuit for providing a product of the first A.C. signal and the second A.C. signal, resulting in a third A.C. signal. Furthermore, the system has a square-difference circuit for providing a difference of a square of the first A.C. signal and a square of the second A.C. signal, the difference being a fourth A.C. signal. The frequency of the third A.C. signal, and the fourth A.C. signal are equal to twice the frequency of the first A.C. signal and the second A.C. signal, and the third A.C. signal and the fourth A.C. signal have a fine phase relation of 90° with each other.
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