低噪声宽带调谐Sziklai对小信号放大器的研究

S. Shukla, G. Srivastava, Syed Shamroz Arshad
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引用次数: 4

摘要

本文的目的是提出并研究基于非匹配bjt的自定义PSpice模型的npn驱动Sziklai对小信号放大器的改进版本。通过额外的偏置电阻,与之前公布的基于BJTs的NPN Sziklai对小信号放大器相比,所提出的放大器产生更高的放大器电流增益(12904),更高的放大器电压增益(304.343),更宽的带宽(2.7107 MHz)和更高的功率增益(65.940 dB-Watt)。它还能够在1KHz频率下为1 \(\mu\) V-1.6mV范围的交流输入信号产生无失真和公平输出。低输入和输出噪声以及出色的热稳定性在工作温度范围-30℃\(\le\) T \(\le\) +50℃是该放大器的首要特点。用匹配的bjt对所提出的放大器进行了检验。对频率响应和相关参数的物理分析进行了详细的研究,如附加偏置电阻RA的影响、电流增益因子\(\beta\)变化的影响、温度依赖性、噪声灵敏度、相位变化、不同偏置电阻和电容的范围以及小信号交流分析。经过改进,该放大器可用于模拟前端放大器,用于监测人体的生物电位信号。调谐性能也使它成为一个合适的候选者,用于广播和电视接收机阶段。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Study of Low-Noise Wide-Band Tuned Sziklai Pair Small-Signal Amplifier
The objective of the paper is to propose and study the modified version of NPN-driven Sziklai pair small-signal amplifier with user-defined PSpice model of unmatched BJTs. With an additional biasing resistance, the proposed amplifier generates higher amplifier current gain (12904), higher amplifier voltage gain (304.343), wider bandwidth (2.7107 MHz) and higher power gain (65.940 dB-Watt) than earlier announced commercial BJTs based NPN Sziklai pair Small-signal amplifier. It is also found capable of producing distortion-less and fair output for a 1\(\mu\)V-1.6mV range of AC input signal at 1KHz frequency. Low input and output noises along with excellent thermal stability over the operational temperature range -30oC \(\le\)T\(\le\)+50oC are the paramount features of this amplifier. Proposed amplifier is also examined with the matched pair of BJTs. An investigation of the physical analysis of frequency responses and related parameters such as the effect of additional biasing resistance RA, effect of variation of current gain factor \(\beta\), temperature dependency, noise sensitivity, phase variation, range of the different biasing resistances and capacitors and small-signal AC analysis is also being performed in detail. With the suggested modifications, the proposed amplifier may be used in analog front-end amplifiers for monitoring the bio-potential signal of the human body. Tuning performance also makes it a suitable candidate to be used in radio and TV receiver stages.
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