Low current drain operational transconductance amplifier

An operational transconductance amplifier (500) includes an input stage (502) having a first and second amplifiers (504, 508) driving class-AB, push-pull amplifiers (506, 510). The input stage (502) receives a differential input signal at first and second amplifier inputs (528, 540). The push-pull a...

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Bibliographische Detailangaben
Hauptverfasser:	CHAMBERS, MARK J
Format:	Patent
Sprache:	eng
Schlagworte:	AMPLIFIERS BASIC ELECTRONIC CIRCUITRY ELECTRICITY IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS RESONATORS
Online-Zugang:	Volltext bestellen
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Beschreibung
Zusammenfassung:	An operational transconductance amplifier (500) includes an input stage (502) having a first and second amplifiers (504, 508) driving class-AB, push-pull amplifiers (506, 510). The input stage (502) receives a differential input signal at first and second amplifier inputs (528, 540). The push-pull amplifiers (506, 510) establish differential currents in a transconductance-setting resistor (512), thereby eliminating the need for static current sources. The biasing levels established by the first and second amplifiers (504, 508) to drive the push-pull amplifiers (506, 510) also control a current source (514). Currents from the current source (514) are summed and provided to amplifier outputs (594, 596).