A New Power-Consumption Optimization Technique for Two-Stage Operational Amplifiers

Sungho BECK  Stephen T. KIM  Michael LEE  Kyutae LIM  Joy LASKAR  Manos M. TENTZERIS  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E94-C   No.6   pp.1138-1140
Publication Date: 2011/06/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E94.C.1138
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Electronic Circuits
Keyword: 
operational amplifier,  active filters,  low-power consumption,  power optimization,  

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Summary: 
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, 3.4–5.0 mW, 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 0.64 mm2.