| 摘要 |
A VCO(Voltage Controlled Oscillator) designing method using a PLL(Phase Locked Loop) method is provided to design a VCO by using an MC145163P VCO chip and transistors for high frequency instead of a one-chip method. A VCO designing method using a PLL method produces a VCO of FM88~108MZ by using VCO functions as a chip instead of one chip and an MC145163P, a crystal oscillator, a mixer, a coil, and a transistor. The VCO is designed on an omnipotent substrate instead of a PCB(Printed Circuit Board). Also, the VCO is produced by directly using the crystal oscillator instead of a chip and winding the coil 7S144 by hands. In the internal basic structure of the MC145163P, a phase detector and a frequency divider are inserted in the chip. The crystal oscillator is attached near by the chip to generate reference frequency. The frequency divider divides frequency by BCD(Binary-Coded Decimal). |
