A filter system for analog video signal processing is discussed. This system is composed of a variable time-constant active RC filter part with balanced-type negative impedance converters (NICs) and an automatic tuning circuit part using a PLL. The system is implemented by a conventional junction-isolated 15- mu m bipolar process with n-p-n transistors of f/sub T/=400 MHz; features low production cost; and it uses an automatic tuning scheme with better accuracy in response than previous systems. A filter system with a passband from 3.7 to 5.2 MHz, and which operates from a single 5-V supply, was implemented by the bipolar process. Experimental results obtained for the filter system are given.
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机译：讨论了用于模拟视频信号处理的滤波器系统。该系统由带有平衡型负阻抗转换器（NIC）的可变时间常数有源RC滤波器部分和使用PLL的自动调谐电路部分组成。该系统通过常规的结隔离15μm双极工艺和f / sub T / = 400 MHz的n-p-n晶体管实现；生产成本低；与以前的系统相比，它使用的自动调整方案的响应精度更高。通过双极性工艺实现了通带范围为3.7至5.2 MHz并由5V单电源供电的滤波器系统。给出了过滤系统的实验结果。
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