Title :
A 1.5-V high drive capability CMOS op-amp
Author :
Palmisano, G. ; Palumbo, G. ; Salerno, R.
Author_Institution :
Dipt. Elettrico e Sistemistico, Catania Univ., Italy
fDate :
2/1/1999 12:00:00 AM
Abstract :
A novel CMOS operational amplifier with a 1.5 V power supply is presented. It is based on a folded-mirror transconductance amplifier and a high-efficiency output stage. The amplifier achieves an open-loop gain and a gain-bandwidth product higher than 65 dB and 1 MHz, respectively. In addition, a 1 V peak-to-peak output voltage into a 500 Ω and 50 pF output load is provided with a total harmonic distortion of -77 dB. This performance was achieved using maximum aspect ratios of 120/1.2 and 360/1.2 for the NMOS and PMOS transistors, respectively, and a quiescent current as low as 60 μA for the driver transistors. The amplifier was implemented in a standard 1.2 μm CMOS process with threshold voltages around 0.8 V. It dissipates less than 300 μW
Keywords :
CMOS analogue integrated circuits; differential amplifiers; harmonic distortion; integrated circuit design; low-power electronics; operational amplifiers; 0.8 V; 1.2 micron; 1.5 V; 300 muW; 60 muA; 65 dB; CMOS op-amp; CMOS operational amplifier; THD; folded-mirror transconductance amplifier; high drive capability; high-efficiency output stage; low-voltage design; quiescent current; total harmonic distortion; CMOS process; Driver circuits; MOS devices; MOSFETs; Operational amplifiers; Power amplifiers; Power supplies; Total harmonic distortion; Transconductance; Voltage;
Journal_Title :
Solid-State Circuits, IEEE Journal of
