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一、引言带通滤波器是仪器仪表开发研究中经常使用的电路。通常的带通滤波器往往是工作频率范围(中心频率及品质因素)固定或仅能在几段频率范围内作有限的调整,并且其外围分立元件较多,设计过程复杂。这种滤波器,在对滤波器工作频率范围的可调性要求不高的情况下,即如:工作频率已知,且固定不变或基本不变的情况,能比较好地满足要求。但是,在科研工作的开发阶段,人们往往对对象(即需要进行滤波的信号)的频率范围并不了解;而在测量系统的实用阶段,由于在许多情况下,对象的有用频率范围在不同工作场合,会发生很大的变化,所以,科研工作的探索性以及测量工
First, the introduction of band-pass filter is often used in the development of instrumentation circuits. Usually band-pass filter is often the operating frequency range (center frequency and quality factor) is fixed or only in a few paragraphs of the frequency range for limited adjustments, and the external discrete components more, the design process is complicated. This filter, the filter in the work of the frequency range of the less demanding conditions, such as: the operating frequency is known, and the same or unchanged, can better meet the requirements. However, people often do not understand the frequency range of the object (that is, the signal to be filtered) during the development of scientific research. However, in the practical stage of the measurement system, since in many cases the useful frequency range of the object is different Occasionally, great changes can take place, so exploratory research and measurement workers