Title :
OTA linearity enhancement technique for high frequency applications with IM3 below -65dB
Author :
Lewinski, Artur ; Silva-Martinez, Jose
Author_Institution :
Analog & Mixed Signal Center, Texas A&M Univ., College Station, TX, USA
Abstract :
A technique to enhance the linearity of continuous-time OTA-C filters, working at high frequencies, is proposed. Experimental results in a standard CMOS 0.35 μm technology are presented. Each OTA consumes 10.5 mW and the transconductance can be tuned from 70 to 160 μA/V while its IM3 remains below -70 dB up to 50 MHz for a 1.3 Vpp input. For a 20 MHz low-pass second-order filter implementation, the measured IM3 with an input voltage of 1.3 Vpp is below -65dB for the entire pass-band. The supply voltage is 3.3 V.
Keywords :
CMOS analogue integrated circuits; VHF amplifiers; circuit tuning; continuous time filters; integrated circuit design; linearisation techniques; low-pass filters; operational amplifiers; 0.35 micron; 1.3 V; 10.5 mW; 20 MHz; 3.3 V; 50 MHz; CMOS; IM3; OTA linearity enhancement technique; OTA-C filters; continuous-time filters; low-pass second-order filter; operational transconductance amplifiers; transconductance tuning; CMOS technology; Degradation; Filters; Frequency; Linearity; Power supplies; Temperature; Topology; Transconductance; Voltage;
Conference_Titel :
Custom Integrated Circuits Conference, 2003. Proceedings of the IEEE 2003
Print_ISBN :
0-7803-7842-3
DOI :
10.1109/CICC.2003.1249349
