Tampere University of Technology

TUTCRIS Research Portal

A new power-consumption optimization technique for two-stage operational amplifiers

Research output: Contribution to journalArticleScientificpeer-review


Original languageEnglish
Pages (from-to)1138-1140
Number of pages3
Issue number6
Publication statusPublished - Jun 2011
Publication typeA1 Journal article-refereed


This paper proposes a technique for two-stage operational amplifiers (OPAMPs) to optimize power consumption according to various channel conditions of wireless communication systems. The proposed OPAMP has the ability of reducing the quiescent current of each stage independently by introducing additional common-mode feedback, therefore more optimization is possible according to the channel conditions than conventional two-stage OPAMPs. The simulations verify the benefits of the technique. As a proof-of-concept topology, the proposed OPAMPs were used in a channel-selection filter for a multi-standard mobile-TV receiver. The power consumption of the filter, 3.4-5.0mW, was adjustable according to the bandwidth, the noise, and the jammer level. The performance of the filter meets the requirements and verifies the effectiveness of the proposed approach. The filter was fabricated in 0.18-μm CMOS and occupied 0.64mm2.


  • Active filters, Low-power consumption, Operational amplifier, Power optimization