LOW VOLTAGE CLASS AB OPERATIONAL TRANSCONDUCTANCE AMPLIFIER

To provide a device including a high current drive class AB operational transconductance amplifier (OTA) output stage that can operate under low supply voltages (e.g., below 0.9 V) while maintaining desired functionality (e.g., reliable startup behavior, well-defined biasing currents, phase margins...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
1. Verfasser: KRZYSZTOF DUFRENE
Format: Patent
Sprache:eng ; jpn
Schlagworte:
Online-Zugang:Volltext bestellen
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:To provide a device including a high current drive class AB operational transconductance amplifier (OTA) output stage that can operate under low supply voltages (e.g., below 0.9 V) while maintaining desired functionality (e.g., reliable startup behavior, well-defined biasing currents, phase margins for improved stability) over a broad range of process, voltage, and temperature variations.SOLUTION: A class AB OTA has a preamplifier stage and a differential OTA output stage 102 coupled to the preamplifier stage, and the differential OTA output stage 102 has at least four folded cascode transistors MP5a, MP5b, MN5a, and MN5b.SELECTED DRAWING: Figure 4 【課題】装置は、広範囲のプロセス、電圧、及び温度変動にわたって所望の機能性(例えば、信頼できる起動動作、明確に定義されたバイアス電流、改善された安定性のための位相マージン)を保ちながら、低い供給電圧(例えば、0.9Vを下回る)で動作可能な高電流ドライブクラスAB演算相互コンダクタンス増幅器(OTA)出力を提供する。【解決手段】クラスAB OTAは、前置増幅器段と、前置増幅器段へ結合された差動OTA出力段102とを有し、差動OTA出力段102は、少なくとも4つのフォールデッドカスコードトランジスタMP5a、MP5b、MN5a、MN5bを有する。【選択図】図4