共查询到20条相似文献,搜索用时 125 毫秒
1.
频率响应是放大电路的一个重要参数,也是选择电路组态和设计电路的一个重要依据。从理论上分析了影响基本共射放大电路频率特性的参数,并且应用仿真实验平台Multisim2001进行相应的分析验证。实验结果与理论分析相符,即影响基本共射放大电路下限截止频率的主要是射极旁路电容、影响上限截止频率的主要是基-射极之间的结电容。 相似文献
2.
提出了一种新型电路拓扑结构的增益模块,该增益模块为达林顿-共射共基结构,对
其工作原理进行了分析。基于AWR Microwave Office软件的仿真结果表明:达林顿晶体管共
射放大电路具有较强的电流放大能力,能有效提高增益;共基放大电路能抑制电路密勒效应
,改善电路高频响应。设计了增益模块的版图,用2 μm InGaP/GaAs HBT工艺成功流片
,测试结果表明:在01~4 GHz频率范围内,该增益模块最大增益为25 dB,最小
增益大于13.5 dB,在900 MHz工作频率时,该增益模块的P1dB为20 d
Bm。 相似文献
3.
4.
姜晖 《电气电子教学学报》2007,29(1):21-22,26
共集-共基组合放大电路具有良好的宽带放大特性,既可以作为缓冲级又能够提供一定的电压和电流增益.这些优异的性能和特点使其在模拟集成电路中得到了广泛应用.文章针对共集-共基组合放大电路的结构特征,在教学实践中按多级放大电路和差分放大电路形式探讨了在线性放大状态下其性能指标的两种分析方法,并相应阐明了其物理意义. 相似文献
5.
6.
7.
在传统光调制器驱动电路中,所用HBT截止频率的大小要达到驱动电路传输速率的4倍以上.文中在输出级采用共射共基HBT形式后,其器件的截止频率只需大于电路传输速率的2倍即可,从电路设计的角度降低了对所用器件的要求.文中分析了新的电路结构提高传输速率的原因并给出了模拟结果.同时新的电路结构也具有良好的热稳定性. 相似文献
8.
用新的电路形式提高HBT光调制器驱动电路的传输速率及性能 总被引:1,自引:1,他引:0
在传统光调制器驱动电路中,所用HBT截止频率的大小要达到驱动电路传输速率的4倍以上.文中在输出级采用共射共基HBT形式后,其器件的截止频率只需大于电路传输速率的2倍即可,从电路设计的角度降低了对所用器件的要求.文中分析了新的电路结构提高传输速率的原因并给出了模拟结果.同时新的电路结构也具有良好的热稳定性. 相似文献
9.
10.
针对场效应管电路分析中不同元件性能参数不同而导致一些理论计算复杂、繁琐,并且难于理解的情况,通过对N沟道增强型MOS场效应管组成的分压-自偏压共源放大电路的理论研究,利用Multisim仿真软件对电路实际工作情况进行模拟,根据二者结果的对比,研究并提出了分压-自偏压共源放大电路的Multisim电路仿真研究的方法。 相似文献
11.
12.
13.
音频功率放大器是音响设备的重要组成部分,功率放大器各级电路的设计、元器件的选用对功率放大器的性能会产生重要影响。实践证明,通过引入差动放大器、渥尔曼电路(Cascode)、晶体管与场效应管混合电路、多管并联输出电路的设计,采用音响专用元器件,对改善放大器的高频响应、瞬态响应、转换速率、减少瞬态互调失真、提高功率放大器的稳定性和控制力等方面取得明显的效果。 相似文献
14.
Microwave transistor amplifier combinations that have controlled frequency response over a specified bandwidth were designed. Theoretical analysis of such an amplifier with an arbitrary number of sections is presented. The response of the amplifier is controlled by tapering the frequency selectivity or Q of each section of the amplifier. To verify the theory, a three-section amplifier with maximally flat time delay response was designed, constructed, and evaluated. Existing traveling-wave amplifiers were modeled as lossy transmission lines. Although the amplifiers were relatively broadband, a prescribed frequency response was not achieved, and each transistor did not receive an equal portion of the signal power. Resistive elements were required for impedance matching at the input and output. The design seeks to improve on previous techniques by trading bandwidth for controlled gain. By making the transmission line that connects the amplifier sections nonuniform, the frequency response was controlled over the design bandwidth. The designs can easily be implemented using familiar components 相似文献
15.
A method for drift reduction in d.c. amplifiers is described. This reduction is obtained using the principle of `adding the lacking part?. The d.c. stabilisation device is a chopper amplifier. The circuit is such that the chopper amplifier does not affect the frequency response of the wideband amplifier. 相似文献
16.
《Solid-State Circuits, IEEE Journal of》1976,11(4):545-547
Inverting integrators are dependent upon the open-loop frequency response of the amplifier. Improvement in frequency performance of an order of magnitude is achieved with two-pole versus single-pole compensation for the same amplifier. Amplifier output impedance can affect integrator frequency response. 相似文献
17.
为了提升光载射频传输链路的链路增益以及传输距离,采用了L波段的超长分布式2阶喇曼放大器结构对光信号进行放大。从理论上对分布式2阶喇曼放大器以及光载射频传输链路的原理进行了解释,利用信号光、1阶抽运光、2阶抽运光以及噪声之间的耦合方程组分析了它们之间的关系,并且得到了基于超长分布式2阶喇曼放大器的光载射频传输系统的1阶射频信号增益。通过数值仿真以及系统实验得到了抽运功率大小对超长分布式2阶喇曼放大器的开关增益的影响、光载射频传输系统在0GHz~7GHz范围内的频率响应及其射频增益以及该光载射频传输链路在应用超长分布式2阶喇曼放大器后的相位噪声情况。结果表明,光载射频传输在超长分布式2阶喇曼放大器的作用下获得了28.1dB的链路增益,在距离为80.94km的光链路上实现了近似无损传输,射频信号开关增益与射频信号频率无关。该研究在光载射频链路的长距离传输中有重要的应用价值。 相似文献
18.
《Solid-State Circuits, IEEE Journal of》1966,1(2):74-81
Logarithmic amplifiers can be made using three basic techniques: nonlinear feedback, nonlinear loads, and successive detection. For very high-frequency, wide-band applications, the successive detection method is the most practical. This paper describes a logarithmic amplifier at UHF frequencies which uses this successive detection method. The design was made with simplicity, cost, and the minimum use of special instruction techniques as prime considerations. Development of a linear amplifier with an amplitude response flat within 3 dB from 380 to 1020 MHz is presented first. The method used to convert the linear amplifier to a logarithmic one is then shown. The result is a logarithmic amplifier with a transfer characteristic which is within /spl plusmn/ 1 dB of logarithmic over an input dynamic range of 40 dB. This amplifier is capable of responding to a 2.5 ns pulse-width RF pulse with a center frequency of 800 MHz. 相似文献
19.
Photodetector frequency response has been measured using an electrooptic modulator in a manner that does not require knowledge of the modulator frequency response. This paper discusses the theory and experimental results for the method and compares them to those obtained by using broadband noise from an optical amplifier 相似文献