A Frequency Synthesizer for LO in Millimeter-wave 5G Massive MIMO System

Abstract

In this paper, a frequency synthesizer for local oscillator (LO) in millimeter-wave 5G massive MIMO system is developed. The frequency synthesizer is based on the phase lock loop (PLL) scheme. Several factors that influence the phase noise, spurs and hopping time of PLL are analyzed. After balancing these performances, the phase detector frequency, loop filter, harmonic suppression filter, amplifiers, frequency doubler are designed, and the implemented PLL frequency synthesizer has low phase noise, low spurs, high output power and a very fine frequency resolution, which make it suitable to be used in 5G massive MIMO system.