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 Study on Frequency Resolved Optical Gating and LD-pumped Frequency-doubled Cr:LiSAF Laser 频率分辨光学快门的理论研究和LD泵浦Cr:LiSAF蓝光激光器的研究 短句来源 Design of a CMOS Monolithic Σ-Δ Fractional Frequency Synthesizer CMOS单片集成的Σ-Δ小数频率合成器设计 短句来源 FREQUENCY STABILITY OF TRANSISTOR FEEDBACK OSCILLATORS 晶体管反馈振荡器的频率稳定 短句来源 Short-Term Frequency Sta-bility of the Rb~(87)Maser 铷87脉泽的短期频率稳定度 短句来源 A Portable 1100MHz Frequency Counter 一种便携的1100MHz频率计数器 短句来源 更多
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 Research of High Frequency and Microwave Bipolar Power Devices 双极高频、微波功率器件的研究 短句来源 Study on the Linearization of Radio Frequency Power Amplifier Based on Predistortion Technology 基于预失真技术的射频功率放大器线性化研究 短句来源 Research on Linearization Technologies for Radio Frequency Power Amplifier 射频功率放大器线性化技术研究 短句来源 A602 TYPE LOW NOISE SELECTIVE FREQUENCY AMPLIFIER 602-A型低噪音选頻放大器 短句来源 Nonlinear Network Frequency Changer 非线性网络变频器 短句来源 更多

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 frequency
 Frequency-Domain Bounds for Nonnegative, Unsharply Band-Limited Functions In this paper we give a further investigation of the method introduced by the author in [1, Frequency-domain bounds for nonnegative unsharply band-limited functions] for proving bounds for functions with nonnegative Fourier transforms. We present two-sided singular value estimates for a class of convolution-product operators related to time-frequency localization. This paper presents an expansion for radial tempered distributions on ${\bf R}^n$ in terms of smooth, radial analyzing and synthesizing functions with space-frequency localization properties similar to standard wavelets. The Balian-Low theorem (BLT) is a key result in time-frequency analysis, originally stated by Balian and, independently, by Low, as: If a Gabor system $\{e^{2\pi imbt} \, g(t-na)\}_{m,n \in \mbox{\bf Z}}$ 更多
 Analysis of the low frequency response of automatic balancing D-C amplifier with mechanical chopper is illustrated by a typical circuit in this paper. The analysis of dynamic response of the modulation and the demodulation circuits and the auxiliary carrier wave amplifier have been considered more in details. The analysis is based on solving difference equations since the intrinsic working process behaved by the M-D M circuits using mechanical chopper is more accurately described by difference equation... Analysis of the low frequency response of automatic balancing D-C amplifier with mechanical chopper is illustrated by a typical circuit in this paper. The analysis of dynamic response of the modulation and the demodulation circuits and the auxiliary carrier wave amplifier have been considered more in details. The analysis is based on solving difference equations since the intrinsic working process behaved by the M-D M circuits using mechanical chopper is more accurately described by difference equation other than by differential equations. 本文結合一个典型线路对带有机械振子的自动稳零直流放大器的低頻特性,进行了分析,并且着重分析了調制解調輔助放大器对緩变信号的频率响应。所用方法是差分方程求解法,因为用差分方程来描述具有机械振子的調制解調线路的固有工作过程,要比用相同的初始条件的微分方程来描述更为准确。文中推导出調制及解調綫路的調制系数k_M、解調系数k_(ДM)以及它們的传递函数。此外,对放大調制波的阻容耦合放大器也进行了分析。分析結果說明,如果放大器耦合迴路的参数选择得合理吋,則此放大器对緩变信号的調制波可作为理想放大器来处理。文中所得結果可作为設計該类型放大器时选择参数的参考。此外,本文对于采用自动稳零直流放大器作运算放大器时可能产生的持續低頻自激振蕩問題,也进行了討論。 In reactance-tube frequency modulation circuits, the fractional frequency deviation is expected to vary with the phase shift constants of the modulator and the LfICf ratio of the tank-circuit of the oscillator. The way in which the frequency deviation is affected by these factors is discussed theoretically. Experimental checks are made, Two types of circuits are studied, the inductive and the capacitive reactance-tube circuits. It is found that within the straight portion, of the operating... In reactance-tube frequency modulation circuits, the fractional frequency deviation is expected to vary with the phase shift constants of the modulator and the LfICf ratio of the tank-circuit of the oscillator. The way in which the frequency deviation is affected by these factors is discussed theoretically. Experimental checks are made, Two types of circuits are studied, the inductive and the capacitive reactance-tube circuits. It is found that within the straight portion, of the operating characteristic of the tube, the agreement is fairly satisfactory. 在电抗管调频电路中,频偏与载波频率之比值,乃随调频器之诸变相常数,及振荡电路中Lf/Cf之比率而变更。本文即就两种基本调频电路,作理论之推引,得出两个基本方程式,表明其间之关系,并佐以实验之证明。 This apparatus is specially designed for studying the vibration of high speed spindles. In order not to affect the vibration, direct contact with the spindie is avoided by using a condenser as transducer in a heterodyne frequency modulation circuit. 本仪器为了研究锭子在高速运转的振动而制造,为了不影响锭子振动,采用了电容为变换器的外差式调频电路以避免与锭子直接接触。 << 更多相关文摘
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