Analysis of Key Performance Parameters of Phase Sampling Digital RF Memories.

摘要

This report explores several performance features of phase sampling digital RF memories, starting with the phase sampling process itself. Spurious signal levels, bandwidth, and processing of simultaneous signals are analyzed using computer modeling of DRFMU(Digital RF Memory Units) functions. The preferred phase sampling technique is to make phase comparisons between samples of the input signal and its 180 deg analog. The input amplifier and the noise immunity of the phase comparator determine the dynamic range. Theoretical spurious levels are tabulated for 2-, 4-, 8-, and 16-state sampling. The data reveal no differences between two-state and four-state sampling. Other tables show output levels for simultaneous signals into eight-state and two-state DRFMS at different combinations of input amplitudes. The advantages of the phase DFRM are large bandwidth, large input signal dynamic range without automatic gain control, and the capability for direct output phase modulation. Digital RF memory, ECM, Phase sampling, Phase Modulation.