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Design of Broad Band I. F. Amplifier. Part II

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1 Author(s)
Baum, Richard F. ; Raytheon Manufacturing Company, Waltham, Massachusetts

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This paper is a continuation of a previous article on the design of broad band I.F. amplifiers of the stagger‐tuned type. The analysis is extended to unrestricted band width. It is shown that an exact solution is possible for either an oscillatory or a monotonic response, with this result: 1. The necessary number of stages (t) for a given minimum attenuation in the cut‐off region depends again only on the gain tolerance and the desired response. 2. Attentuation minima and maxima again appear at frequencies within the band, easily located and dependent only on the number of stages. 3. The amplifier consists of a number of pairs of circuits, which have the same figure of merit Qn and tune at resonant frequencies f0n disposed in geometric symmetry around the middle band frequency f0 thus making f0n equal to δnf0 and f0n, respectively. Formulas for Qn and δn are derived. The circuit impedances are calculated from a prescribed gain or from the maximum obtainable gain. A formula for the maximum gain band width product is given. A comparison is made between the performance of amplifiers with monotonic and oscillatory response. A practical example is worked out.

Published in:

Journal of Applied Physics  (Volume:17 ,  Issue: 9 )