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首页> 外文期刊>International journal of RF and microwave computer-aided engineering >Narrowband high-selectivity active bandpass filters using open-loop multiple-ring resonators
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Narrowband high-selectivity active bandpass filters using open-loop multiple-ring resonators

机译：使用开环多环谐振器的窄带高选择性有源带通滤波器

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This article presents a narrowband high-selectivity active bandpass filter that is constructed by two passive bandpass filters and one amplifier. The bandpass filters with two transmission zeros provide a sharp cutoff frequency response to suppress adjacent channel interferences. The amplifier coupling to the passive bandpass filters not only compensates for the insertion loss of the passive filters, but also provides gain for the active filter. Since the amplifier uses only one transistor, the active filter can lower the cost, minimize the noise, and be easily designed to operate in a stable region. Moreover, the complete active filter consisting of a filter placed in front of the amplifier can suppress unwanted signals in order to reduce the noise floor of the active filter and achieve a wide dynamic range. The active filter has a 6.8-dB gain at 2 GHz, a 3-dB fractional bandwidth of 2.4%, and stopband rejection better than 40 dB within 1-3 GHz. The minimal noise figure of the active filter is 2.6 dB at the passband. This high-performance active filter can be used in many wireless communication systems. (C) 2004 Wiley Periodicals, Inc.
机译：本文介绍了一种窄带高选择性有源带通滤波器，该滤波器由两个无源带通滤波器和一个放大器构成。具有两个传输零的带通滤波器可提供尖锐的截止频率响应，以抑制相邻信道的干扰。耦合到无源带通滤波器的放大器不仅可以补偿无源滤波器的插入损耗，还可以为有源滤波器提供增益。由于放大器仅使用一个晶体管，因此有源滤波器可以降低成本，将噪声降至最低，并易于设计以在稳定区域工作。此外，由放置在放大器前面的滤波器组成的完整有源滤波器可以抑制不想要的信号，从而降低有源滤波器的本底噪声并实现宽动态范围。有源滤波器在2 GHz时具有6.8 dB的增益，在3-dB时的分数带宽为2.4％，在1-3 GHz范围内的阻带抑制优于40 dB。有源滤波器在通带处的最小噪声系数为2.6 dB。这种高性能的有源滤波器可用于许多无线通信系统。 （C）2004年Wiley Periodicals，Inc.

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