Accession Number : AD0716529

Title :   Some Questions in the Theory of Auto Collector Modulation (AKM) and Amplitude-Frequency Distortion in AKM,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Sudakov,Yu. I.

Report Date : 29 OCT 1970

Pagination or Media Count : 22

Abstract : In his previous works, Yu. I. Sudakov has shown the possibility of the base or collector amplitude modulation in externally excited transistorized oscillators connected in a common emitter configuration. Base modulation requires a low power modulator which provides low efficiency (35-40 percent), while collector modulation (with 70-80 percent efficiency) requires a more powerful modulator. The disadvantages of both modulation types are manifested sharply if they are designed for the output stages of transistorized transmitters. The author has proven that collector self-modulation (CSM) in the output stage with a common emitter combines the positive properties of base and collector types of modulation. The present article is devoted to an analysis of an equivalent circuit of a stage with the low-frequency CSM. One of the most simple CSM's is a circuit in which the self-bias has been introduced. To verify the fundamental theoretical conclusions reached in the analysis presented, an experimental test circuit was designed. Measurements of CMS frequency-amplitude distortions in the transmitter output stage were carried out at a frequency of 3mHz. The modulation frequency was varied from 100 to 10,000 to 128,000 Hz. The induction of the inductor was changed with the aid of a switch. (Author)

Descriptors :   (*RADIOFREQUENCY OSCILLATORS, AMPLITUDE MODULATION), TRANSISTORS, USSR

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE