In this paper, the serial input integratedPLL frequency synthesizer-MB1504 and the commonly-used single chip microprocessor-PIC12C5081509 areintroduced. The size of PIC12C5081509 is minium inthe present world.

• 介绍了串行输入集成销相频率合成器芯片MB1504和目前国际上体积最小的通用单片机PIC12C508/509，给出了以MB1504和PIC12C508/509为主构成的微型频率合成器设计电路。