A 0.5 MHz-0.9 MHz single-chip NMOS PLL LSI for frequency synthesizer

A phase-locked loop (PLL) large-scale integration (LSI) chip operating in the broadcast frequency band from MF to UHF has been developed using an N-channel enhanced double diffusion (ED) MOS process technology with 0.8- mu m effective channel length. The operation of the PLL has been verified for frequencies from 0.2 MHz to 1200 MHz for a power-supply voltage of 5 V and an input signal amplitude of 100 mV RMS. The authors describe the N-channel ED MOS process technology that enables direct division of high-frequency signals up to the UHF band, and the high-speed circuit technology, functions, and special features of the circuit.