OSCILLATION FREQUENCY ADJUSTING APPARATUS, OSCILLATION FREQUENCY ADJUSTING METHOD AND WIRELESS COMMUNICATION APPARATUS

摘要

A voltage-controlled type oscillation circuit (2) oscillates at an oscillation frequency that is in accordance with a control voltage. Injection-locked type oscillation circuits (3, 4) oscillate at an oscillation frequency that is in accordance with an output signal from the voltage-controlled type oscillation circuit (2). A mixer circuit (5) performs a frequency conversion on the basis of output signals from the injection-locked type oscillation circuits (3, 4). A synchronization determining unit (6) determines the synchronous status between the injection-locked type oscillation circuits (3, 4) in accordance with an output signal from the mixer circuit (5). The injection-locked type oscillation circuits (3, 4) synchronize with each other at a frequency that is an integral multiple of the oscillation frequency of the voltage-controlled type oscillation circuit (2).