ID 原文 译文
43946 分析了合格与失效电路的噪声功率谱密度和时间序列，并提取 GaAs PHEMTMMIC 功率放大器 1 /f 噪声的幅度值、噪声指数和转折频率。 The noise power spectral density and timeseries of the qualified circuits and the failure ones were tested respectively, from which the amplitude, noise index and transition frequency of 1 /f noise of GaAs PHEMT MMIC power amplifier were extracted.
43947 测试结果表明，MMIC 功率放大器的噪声主要为1 /f 噪声和热噪声。 The test results show that the noise of MMIC power amplifier is mainly 1 /f noise and thermal noise.
43948 从噪声功率谱密度来看，失效电路的噪声比合格电路的噪声大; From the noise power spectral density, the noise of the failure circuit is larger than that of the qualified circuit.
43949 从时间序列来看，失效与合格电路的噪声谱幅值不同， From the terms of time series, the noise spectral amplitude of the failure circuits is different from that ofthe qualified ones.
43950 失效电路的噪声谱幅值变化无规律且为爆裂噪声， The variation of the noise spectral amplitude of the failure circuits is irregular, and the noise is considered to contain burst noise.
43951 合格电路的噪声谱幅值变化有规律且主要是 1 /f 噪声; The variation of the spectral amplitude of the qualified circuits isregular, and the noise is mainly 1/f noise.
43952 从噪声参量提取来看，1 /f噪声的幅度值、噪声指数和转折频率均可作为噪声的表征参量。 From the extraction of noise parameters, the amplitude value of1/f noise, noise index and transition frequency can be used as the characterization parameters of noise.
43953 基于 CMOS 工艺，设计了一款可用于无线卫星通信系统的低相噪、低杂散、24 bit 分数分频频率综合器。 A low phase noise, low spur and 24 bit fractional synthesizer for wireless satellite communications system was designed based on the CMOS process.
43954 频率综合器内部集成 LC 压控振荡器 ( VCO) ，通过自动增益控制电路调整VCO 输出频率，采用电荷泵偏移电流线性化技术及 Δ-Σ 调制器加抖动技术改善相位噪声和杂散性能。 The LC voltage-controlled oscillator (VCO)was integrated in the frequency synthesizer, and the output frequency of VCO was adjusted by the automatic gain control circuit.The charge pump current-offset linearization technique and Δ-Σ modulatordithering techniques were used to improve the phase noise and spur performance.
43955 在整数模式和分数模式下，带内相位噪声分别为－106. 2 dBc /Hz 和－99. 7 dBc /Hz。 In the integer mode andfraction mode the in-band phase noises are －106.2 dBc /Hz and －99.7 dBc /Hz, respectively.