Frequency Synthesizer Using Dual Offset Mixing for Low Phase Noise and Narrow Resolution

Abstract

This paper introduces a low in-band phase noise synthesizer with narrow frequency resolution. In order to improve the noise characteristic, the output frequency of the voltage controlled oscillator is converted into a fixed low IF signal by two mixers. Therefore, the N division ratio is relatively reduced, which means the minimization of the in-band phase noise. To confirm the noise performances, this synthesizer is simulated and analyzed through the phase domain noise model. This paper presents the simulation results for the phase noise, spurious, and acquisition time