For Full-Text PDF, please login, if you are a member of IEICE,|
or go to Pay Per View on menu list, if you are a nonmember of IEICE.
A Low-Power Current-Reuse LNA for 3D Ultrasound Beamformers
Yohei NAKAMURA Shinya KAJIYAMA Yutaka IGARASHI Takashi OSHIMA Taizo YAMAWAKI
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences
Publication Date: 2021/02/01
Online ISSN: 1745-1337
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuit Techniques and Related Topics)
amplifier, current-reuse, driver, ultrasound, LNA,
Full Text: FreePDF
3D ultrasound imagers require low-noise amplifier (LNA) with much lower power consumption and smaller chip area than conventional 2D imagers because of the huge amount of transducer channels. This paper presents a low-power small-size LNA with a novel current-reuse circuitry for 3D ultrasound imaging systems. The proposed LNA is composed of a differential common source amplifier and a source-follower driver which share the current without using inductors. The LNA was fabricated in a 0.18-μm CMOS process with only 0.0056mm2. The measured results show a gain of 21dB and a bandwidth of 9MHz. The proposed LNA achieves an average noise density of 11.3nV/√Hz, and the 2nd harmonic distortion below -40dBc with 0.1-Vpp input. The supply current is 85μA with a 1.8-V power supply, which is competitive with conventional LNAs by finer CMOS process.