VOLTAGE-CONTROLLED OSCILLATOR AND COMMUNICATION DEVICE

摘要

PROBLEM TO BE SOLVED: To obtain a voltage-controlled oscillator which can handle an oscillation output signal as a balanced signal without providing any extra unbalanced- balanced converter outside and to obtain a communication device which uses it. SOLUTION: Voltage-controlled oscillators are constituted in each of layers of a ceramic multi-layered substrate and an unbalanced transmission line and a balanced transmission line are provided across a specific ceramic layer to constitute an unbalancedbalanced converting circuit through the mutual induction coupling between both transmission lines.