Patent ID: 6369633
Filing Date: 2002-04-09
Classification: H03B,H03C

Abstract:
A quadrature signal generation system comprising;a pair of input terminals receiving a first A.C. signal and a second A.C. signal, each having a predetermined frequency and phase relation of approximate 90Â° with each other, a multiplier circuit for providing a product of said first A.C. signal and said second A.C. signal, said product being called a third A.C. signal, 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, said difference called a fourth A.C. signal, the frequency of said third A.C. signal and said fourth A.C. signal being equal to twice of frequency of said first A.C. signal and said second A.C. signal, and said third A.C. signal and said fourth A.C. signal having fine phase relation of 90Â° with each other.