GAIN VARIABLE AMPLIFIER CIRCUIT

PURPOSE:To improve the reproducibility for gain setting by connecting a FET between the input and output of an operational amplifier and connecting an output of the operational amplifier to a gate of the FET via a window comparator. CONSTITUTION:An inverted input terminal 4 of the operational amplif...

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Bibliographische Detailangaben
1. Verfasser:	SUKAI YASUNORI
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRONIC CIRCUITRY CONTROL OF AMPLIFICATION ELECTRICITY
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Beschreibung
Zusammenfassung:	PURPOSE:To improve the reproducibility for gain setting by connecting a FET between the input and output of an operational amplifier and connecting an output of the operational amplifier to a gate of the FET via a window comparator. CONSTITUTION:An inverted input terminal 4 of the operational amplifier 2 is connected to a signal input terminal 16 via a resistor 14 and an input signal V1 is inputted to the terminal 16. Moreover, the terminal 4 is connected to an output terminal 8 of the operational amplifier 2 via an N-channel FET 10. The output terminal 8 of the operational amplifier 2 is connected to the gate of the FET 10 via a window comparator 12. An output voltage of the operational amplifier 2, that is, the output signal V2 is a constant voltage in response to the gain setting voltage V3 applied to the window comparator 12.