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      • HARVEST
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      R-C ACTIVE BANDPASS FILTERS

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      Chong_K_W_1962_sec.pdf (11.99Mb)
      Date
      1962-10-24
      Author
      Chong, K W
      Type
      Thesis
      Degree Level
      Masters
      Metadata
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      Abstract
      The design of an R-C active bandpass filter is discussed. The filter exhibits double "humping" effects similar to these of two tightly coupled identically tuned parallel L-C circuits. The degree of humping can be controlled to give good amplitude flatness and phase linearity within the passband. The active element of the filter is a do feedback amplifier using Ge transistors. The feedback network consists of two identically tuned R-C twin-T's in cascade. Control of the humping is achieved by varying the complex impedance bridging one of the twin-T's. When the source and load impedances are pure resistances a rigid relationship between the source load product and the twin-T parameters is neseeseary for symmetrical skirt-response. By making the source and load impedance complex, the skirt-response is always symmetrical provided the R-C product of the source and load impedances is identical to that of the twin-T. R-C active bandpass filters have been designed to work in the audio and sub-audio frequency ranges. They have a pass-to-reject ratio in excess of 40db with a bandwidth of approximately 40 per cent of the centre frequency using an amplifier with a voltage gain of 250. In a modified version using an *active twin-T" a pass-to-reject ratio in excess of 45db and a bandwidth of 6 per cent of the centre frequency is obtained. The band edges of the modified version are mach steeper. Design-charts showing bandwidth and amplifier-gain for various twin-T parameters have been constructed to suit different amplifier input and output impedances.
      Degree
      Master of Science (M.Sc.)
      Department
      Electrical and Computer Engineering
      Program
      Electrical Engineering
      Copyright Date
      October 24th, 1962
      URI
      http://hdl.handle.net/10388/11582
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      • Graduate Theses and Dissertations
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