A Low Power Driver Amplifier for Unlicensed 2.4 GHz Band

Viet-Hoang LE  Seok-Kyun HAN  Sang-Gug LEE  

IEICE TRANSACTIONS on Electronics   Vol.E94-C   No.1   pp.120-123
Publication Date: 2011/01/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E94.C.120
Print ISSN: 0916-8516
Type of Manuscript: BRIEF PAPER
Category: Microwaves, Millimeter-Waves
current reuse,  driver amplifier,  high drain efficiency,  high PAE,  low power transmitter,  

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This paper presents the design of a driver amplifier (DA) for a cordless mouse application, operating at the 2.4 GHz ISM unlicensed band. The DA is a single-ended topology, and is composed of two stages: the first stage is a cascode amplifier to provide high gain and good input-output isolation, while the output stage is a simple common source amplifier that adopts a novel current reuse scheme to reduce the DC bias current by half. The DA implemented in a 0.18 µm CMOS process has a 16 dB gain at 2.4 GHz, and it can drive a 3 dBm to the antenna with an output stage drain efficiency of 31% and a power-added efficiency (PAE) of 20% while drawing 4.5 mA from a 1.8 V supply.