The universal opamp and applications in continuous-time resistorless and capacitorless linear weighted voltage addition

Author

Ramírez-Angulo, Jaime ; Ledesma, Francisco

Author_Institution

Texas Instrum. Inc., Dallas, TX, USA

Volume

53

Issue

5

fYear

2006

fDate

5/1/2006 12:00:00 AM

Firstpage

404

Lastpage

408

Abstract

A versatile analog building block denoted the universal operational amplifier (opamp) is introduced. The circuit is a generalized version of the fully differential difference opamp with 2n weighted differential inputs. Applications in resistorless and capacitorless continuous-time linear weighted voltage addition are discussed. Experimental results of a test chip prototype are shown that validate the proposed approach. Simulations show potential for high frequency operation of the circuit with gain-bandwidth close to 140 MHz in 0.5-μm CMOS technology.

Keywords

CMOS analogue integrated circuits; continuous time systems; operational amplifiers; 0.5 micron; CMOS technology; analog building block; capacitorless linear weighted voltage; high frequency operation; resistorless linear weighted voltage; universal opamp; CMOS technology; Differential amplifiers; Impedance; MOSFET circuits; Negative feedback; Operational amplifiers; Resistors; Transconductance; Transconductors; Voltage; Amplifiers; CMOS integrated circuits; analog circuits; low-voltage 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.2006.869918

Filename

1632353