Title :
A simple slew rate enhancement technique with improved linearity and preserved small signal performance
Author :
Bin Huang ; Degang Chen
Author_Institution :
Dept. of Electr. & Comput. Eng., Iowa State Univ., Ames, IA, USA
Abstract :
A simple yet very effective slew rate enhancement (SRE) method is proposed. The proposed SRE feedback is off for small signal operation to preserve an amplifier´s small signal performance, and is activated to enhance slew rate (SR) and linearity only when an amplifier is slewing. Compared with a conventional OTA, the OTA with the proposed SRE scheme shows SRE by a factor of 23.2, THD improvement of 6dB and preserved small signal performance with only 1.2% area and 2% power consumption overhead. Compared with the adaptive biasing method, the proposed scheme shows 300% SR improvement, 18dB THD improvement but with power and area consumption decreased by 11.1% and 25% respectively.
Keywords :
circuit feedback; harmonic distortion; operational amplifiers; OTA; SRE feedback; THD; adaptive biasing method; amplifier small signal performance; area consumption; improved linearity; power consumption overhead; preserved small signal performance; simple slew rate enhancement technique; small signal operation; CMOS integrated circuits; Equations; Linearity; Mathematical model; Operational amplifiers; Solid state circuits; Transient analysis; slew rate enhancement;
Conference_Titel :
Circuits and Systems (MWSCAS), 2014 IEEE 57th International Midwest Symposium on
Conference_Location :
College Station, TX
Print_ISBN :
978-1-4799-4134-6
DOI :
10.1109/MWSCAS.2014.6908404
