Title :
A CMOS transconductor with 90 dB SFDR and low sensitivity to mismatch
Author :
Acosta, Lucia ; Carvajal, Ramon G. ; Jiménez, Mariano ; Ramirez-Angulo, Jaime ; Loper-Martin, A.
Author_Institution :
Escuela Superior de Ingenieros, Seville Univ., Sevilla
Abstract :
This paper presents a new CMOS transconductor amplifier able to achieve 90dB of SFDR. It is based in the creation of low impedance nodes using local feedback to drive a degeneration resistor. Then, the current generated at the resistor is delivered directly to the output using source coupled pairs. The proposed transconductor does not rely on current mirrors or in cancellation of nonlinear terms, thus improving significantly the linearity and the robustness against mismatch. Simulation results are provided that show THD of 91 dB and an IM3 of 81 dB at 10MHz with 2Vpp differential input-output signal
Keywords :
CMOS integrated circuits; harmonic distortion; impedance matching; operational amplifiers; 10 MHz; 2 V; CMOS transconductor amplifier; current mirrors; degeneration resistor; harmonic distortion; local feedback; source coupled pairs; Feedback; Filters; Impedance; Linearity; Mirrors; Resistors; Signal processing; Topology; Transconductors; Voltage;
Conference_Titel :
Circuits and Systems, 2006. ISCAS 2006. Proceedings. 2006 IEEE International Symposium on
Conference_Location :
Island of Kos
Print_ISBN :
0-7803-9389-9
DOI :
10.1109/ISCAS.2006.1692524
