Theoretical analysis of the loop-gain modulator

Author

Comer, David J. ; Fox, David K.

Author_Institution

Dept. of Electr. & Comput. Eng., Brigham Young Univ., Provo, UT, USA

Volume

37

Issue

12

fYear

1990

fDate

12/1/1990 12:00:00 AM

Firstpage

1556

Lastpage

1559

Abstract

A recently introduced concept in amplitude modulation circuits is based on the modulation of the loop gain of a sinusoidal feedback oscillator. A model for the loop-gain modulator is proposed and discussed. The linearity of modulation for either the class-A or class-C stage is excellent for modulation indexes that approach unity. This linearity is comparable to that of the collector modulation circuit. The modulation source power requirement is minimized by placing this source in the base circuit of the transistor. The power requirement for the modulation source is two to three orders of magnitude less than that of the collector modulation circuit

Keywords

amplitude modulation; feedback; modulators; network analysis; AM; amplitude modulation circuits; class-A stage; class-C stage; loop-gain modulator; model; modulation linearity; modulation source power requirement; sinusoidal feedback oscillator; Amplitude modulation; Bipolar transistors; Circuits; Frequency; Linearity; Oscillators; Power engineering computing; Power generation; Power supplies; Voltage;

fLanguage

English

Journal_Title

Circuits and Systems, IEEE Transactions on

Publisher

ieee

ISSN

0098-4094

Type

jour

DOI

10.1109/31.101278

Filename

101278