Free class AB–AB Miller opamp with high current enhancement

• Published in: Electronics letters 2015-02, Vol.51 (3), p.215-217
• Main Authors: Roman-Loera, Alejandro, Ramirez-Angulo, Jaime, Lopez-Martin, Antonio, Carvajal, Ramon G
• Format: Article
• Language: English
• Subjects: Chip formation; Circuits; Circuits and systems; CMOS; CMOS analogue integrated circuits; CMOS technology; dynamic output quiescent current generation; Electric potential; free class AB–AB two‐stage Miller op‐amp; High current; operational amplifiers; Power consumption; Simulation; size 0.18 mum; size 130 nm; size 45 nm; size 65 nm; size 90 nm; Voltage
• ISSN: 0013-5194; 1350-911X; 1350-911X
• DOI: 10.1049/el.2014.4064

A two-stage (Miller) operational amplifier (opamp) with both class AB input and output stages is introduced. It has a well-controlled quiescent current and generates dynamic output currents of up to a factor 45 times larger than the quiescent current. It uses very compact circuitry with small static power consumption in order to achieve class AB–AB operation and can operate with a low supply voltage. Experimental results of a test chip fabricated using 0.18 μm CMOS technology and simulations in 130, 90, 65 and 45 nm verify the proposed circuit.