Theoretical analysis of the loop-gain modulator

Theoretical analysis of the loop-gain modulator

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 modulati...

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Veröffentlicht in:IEEE transactions on circuits and systems 1990-12, Vol.37 (12), p.1556-1559
Hauptverfasser: Comer, D.J., Fox, D.K.
Format: Artikel
Sprache:eng
Schlagworte:
Amplitude modulation
Applied sciences
Bipolar transistors
Circuit properties
Circuits
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Frequency
Linearity
Oscillators
Oscillators, resonators, synthetizers
Power engineering computing
Power generation
Power supplies
Voltage
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Beschreibung
Zusammenfassung: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.< >
ISSN:0098-4094
1558-1276
DOI:10.1109/31.101278