Low-voltage high-performance voltage-mode and current-mode WTA circuits based on flipped voltage followers

Author

Ramírez-Angulo, J. ; Ducoudray-Acevedo, G. ; Carvajal, R.G. ; López-Martín, A.

Author_Institution

Klipsch Sch. of Electr. Eng., New Mexico State Univ., Las Cruces, NM, USA

Volume

52

Issue

7

fYear

2005

fDate

7/1/2005 12:00:00 AM

Firstpage

420

Lastpage

423

Abstract

A new low-voltage CMOS winner-take-all (WTA) circuit is presented. The proposed circuit exhibits a linear increase of complexity with the number of inputs at the rate of only three transistors per input and it is based on a modified version of the common source scheme. In this case, each input follower is enhanced by local shunt feedback to increase its gain and to reduce its output impedance. Simulations demonstrate the potential of the circuit to operate at very high speed, with high precision and with a supply voltage close to a transistor´s threshold voltage. Experimental verification of the circuit using a 0.5-μm CMOS technology is also provided.

Keywords

CMOS analogue integrated circuits; circuit complexity; circuit feedback; current-mode circuits; low-power electronics; 0.5 micron; CMOS analog integrated circuit; common-emitter configuration; current-mode WTA circuits; flipped voltage followers; local shunt feedback; low-voltage CMOS winner-take-all circuit; low-voltage WTA circuits; voltage-mode WTA circuits; Analog circuits; CMOS analog integrated circuits; CMOS technology; Circuit simulation; Circuit synthesis; Impedance; Output feedback; Signal processing; Signal synthesis; Threshold voltage; Analog CMOS circuits; winner-take-all (WTA) analog circuits;

fLanguage

English

Journal_Title

Circuits and Systems II: Express Briefs, IEEE Transactions on

Publisher

ieee

ISSN

1549-7747

Type

jour

DOI

10.1109/TCSII.2005.850433

Filename

1468343