| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide the phase shift circuit for a spread code, in which a phase is switched for one clock even when a large phase shift is switched by avoiding a problem of a conventional circuit that a much time is required to switch a large phase shift, because the phase shift has been available for the shift equivalent to deleted clock number. SOLUTION: After a PN code received from a PN code generator 9 has been written in a storage circuit 5, the storage circuit 5 is set to a read state and a value outputted from an adder circuit 2 is given to the storage circuit 5 through a switch circuit 4 as a read address. In the case that a phase setting input is negative, since the value is equal to a preceding write address by the phase setting input value, a PN code at the address which has been written precedingly by an amount corresponding to the phase setting input is read from the storage circuit 5, and the PN code delayed by the clock period of the phase setting input is obtained from an output terminal 11. Since the write/ read to/from the storage circuit 5 is executed for one clock of the PN code, the phase shift processing corresponding to an optional phase setting input is completed for a period of one clock of the PN code.</p> |
