Title :
High-drive CMOS current amplifier
Author :
Palmisano, Giuseppe ; Palumbo, Gaetano ; Pennisi, Salvatore
Author_Institution :
Dipt. Elettrico, Elettronico e Sistemistico, Cantania Univ., Italy
fDate :
2/1/1998 12:00:00 AM
Abstract :
A high-performance current amplifier is proposed which is based on a folded-cascode transresistance amplifier and a low-distortion class AB current output stage. The loop gain of the transresistance amplifier exhibits a gain bandwidth product of 10 MHz and a DC gain as high as 100 dB which allows accurate closed-loop operations to be achieved. Despite the intrinsic low-linearity performance of current amplifiers with respect to their voltage amplifier counterpart, the proposed circuit provides an output current of 7 mA with a total harmonic distortion (THD) better than -55 dB while requiring only 200 μA of quiescent current for the output transistors. The circuit was fabricated in a 1.2 μm CMOS process, uses a 5 V power supply, and dissipates 4 mW
Keywords :
CMOS analogue integrated circuits; compensation; feedback amplifiers; harmonic distortion; integrated circuit noise; power amplifiers; 1.2 micron; 100 dB; 200 muA; 4 W; 5 V; 7 mA; CMOS current amplifier; CMOS process; THD; accurate closed-loop operations; class AB current output stage; folded-cascode transresistance amplifier; high-drive CMOS current amplifier; low-distortion output stage; total harmonic distortion; Bandwidth; CMOS process; Circuits; Feedback; High power amplifiers; Impedance; Linearity; Operational amplifiers; Total harmonic distortion; Voltage;
Journal_Title :
Solid-State Circuits, IEEE Journal of
