| 摘要 |
PROBLEM TO BE SOLVED: To avoid a situation where an error occurs in a carrier digital signal and which results from the feedback of a sent carrier digital signal to a local oscillating part and also to fuly operate with only a single local oscillating part by applying quadrature modulation to a carrier signal which has a prescribed frequency by a base band signal. SOLUTION: A quadrature modulation part 21 forms a carrier digital signal SDI with a dividing signal SLD as a carrier signal by applying quadrature modulation to the carrier signal by a digital base band signal DI from a digital signal generation part 11. A frequency transformation part 25 undergoes frequency transformation by using a 2nd distributing signal about the signal DSI through an LPF, from which the part 25 acquires an output carrier digital signal SCI. The signal SCI which is acquired from the part 25 is amplified by an amplifier, supplied to a sending antenna 15 and transmitted by radio after an image frequency component, etc., is eliminated by a BPF. |
