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概述本文对噪声及杂波极低的645A 型综合器采用的直接综合法作全面探讨。该仪器在50兆赫处的(赫取样点剩余相位噪声为L(1Hz)=-100分贝/赫,然后,L(fm)以每10倍频程12分贝降低到-137分贝/赫,的背景噪声。非谐波的杂波含量低于100分贝。频率程序控制转换时间小于20微秒。本文分3节:
Overview This article provides a comprehensive discussion of the direct synthesis method used in the 645A Synthesizer with very low noise and clutter. The instrument has a residual phase noise of L (1 Hz) = -100 dB / Hz at 50 MHz (Hz sample point) and then L (fm) is reduced to -137 dB / Hz at 12 dB per 10 octave Noise. The non-harmonic clutter content is less than 100 dB. The frequency program control transition time is less than 20 microseconds. This article is divided into 3 sections: