AUTOMATIC FREQUENCY CONTROL OF SATELLITE COMMUNICATION EARTHSTATION SYSTEM AND AUTOMATIC GAIN CONTROL DEVICE

PURPOSE: To obtain automatic gain adjustment whose performance is improved even in a system with low S/N by using an automatic gain adjusting device for adjusting the gain of a variable gain amplifier by detecting the signal level of demodulated data. CONSTITUTION: A root mean detecting and holding...

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Bibliographische Detailangaben
Hauptverfasser:	CHIYOU SHINKOU, OMOTE CHIYORUSHIYOKU, SAI ZAIEKI
Format:	Patent
Sprache:	eng
Schlagworte:	AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATIONOF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES BASIC ELECTRONIC CIRCUITRY CONTROL OF AMPLIFICATION ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY SELECTING RESONANT CIRCUITS TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHICCOMMUNICATION TUNING RESONANT CIRCUITS
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Beschreibung
Zusammenfassung:	PURPOSE: To obtain automatic gain adjustment whose performance is improved even in a system with low S/N by using an automatic gain adjusting device for adjusting the gain of a variable gain amplifier by detecting the signal level of demodulated data. CONSTITUTION: A root mean detecting and holding circuit 10 detects and holds the level of inputted I and Q data. A peak detecting and holding circuit 11 peak-detects and holds a reference voltage. An adder 12 constituted of an OP amplifier receives the signal level and the reference voltage at the non-inversion terminal and the inversion terminal, and generates an output equivalent to (I+Q)-(2 × the reference voltage) for preparing an output voltage equivalent to the size of the signal level. An integrator 13 integrates the voltage prepared by the adder 12, generates a control voltage, and controls the gain of the variable gain amplifier.