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Abstract
An earlier paper discussed the design of an Ie-controlled I.F. amplifier stage employing partial neutralization. The inherent variation in the band-pass characteristics of such a transistor amplifier stage was demonstrated.
In this paper, data are presented regarding a transistor I.F. amplifier stage employing partial neutralization and operating at low collector voltages. The gain of such a stage can be controlled by varying the collector voltages. A transistor collector detector stage can also provide, besides the demodulated audio frequency signal, the control voltage necessary to secure A.G.C, for the preceding high frequency stages.
A modified circuit of such a detector stage is presented in this paper and this can be employed to drive simultaneously the Ie-controlled and the Vc-controlled transistor stages. The performance data for such a detector stage and a method of connecting in tandem an Ie- and a Vc-controlled stage are demonstrated. The resulting I.F. amplifier and detector stages have band-pass characteristics that are stabilized with respect to the utilization of the A.G.C. The design consequently provides a means to overcome the stabilization problems in transistorized professional and semi-professional equipment.