A DIVIDED-BAND AMPLIFIER SYSTEM USING CONSTANT-RESISTANCE NETWORKS.
CORNELL UNIV ITHACA N Y ELECTRICAL ENGINEERING RESEARCH LAB
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The purpose of this study is the utilization of high-pass and low-pass constant-resistance networks in a dividedband amplifier system. A design procedure is developed to provide a flat frequency response for a system with 2 to the n power amplifiers, n 1,2,.... The networks used as the amplifiers in this system are designed with equal input and output resistances and the proper gains. A computer program was modified to handle the complexity of the calculations involved in determining the results to be expected from the eight-amplifier divided-band structure. These results indicate that the system, with its crossover frequencies equally spaced on a linear scale, is not suited to application as a shaping filter. They also demonstrate, however, that the system, with its crossover frequencies equally spaced on a logarithmic scale, possesses a frequency response that can be easily shaped. The use of this structure as a time-varying system also shows promise. A simple relation exists between the value of the frequency response at any one frequency and the gains of the amplifiers. The response of the divided-band structure is strongly influenced by a change in the multiplying factor separating the crossover frequencies of the highpass and low-pass networks. The design procedure, however, includes the means of obtaining a flat response for any interval between cutoff points. Author