A Study on the Implementation of Modulator Using High-Speed Pulse Swallow Prescaler for AMPS Cellular Communication

AMPS Cellular 통신을 위한 고속 Pulse Swallow Prescaler를 이용한 변조기 구현에 관한 연구

A Tx modulator of the AMPS cellular wireless communication has been implemented using the PLL synthesizer, of which is modified for multiple frequency output capability. The frequency range is in 825-845 MHz with the 666 channels of 30KHz channel spacing and its switching time is less than 40 msec. The purpose of this paper is to develope the PLL frequency synthesizer with the high speed pulse swallow prescaler in order to save power consumption and cost. The PLL frequency synthesizer is studied in this paper to apply the cellular communication modulator.