NDLI: A dual bias-feed circuit design for SiGe HBT low-noise linear amplifier

Content Provider	IEEE Xplore Digital Library
Author	Taniguchi, E. Ikushima, T. Itoh, K. Suematsu, N.
Copyright Year	1963
Abstract	An SiGe HBT low-noise amplifier (LNA) with a novel diode/resistor dual base bias-feed circuit is described. The dual bias-feed circuit extends P1 dB without degradation of the noise figure (NF). In the small-signal region, a conventional resistor bias-feed circuit is a dominant base current source and, in the large-signal region, the diode turns on and the diode bias-feed circuit supplies the base current like a voltage source, which allows higher output power and linearity. In this paper, the operation principle of the dual bias-feed circuit is explained by using a virtual current source model, which indicates the increase of base current of the HBT in a large-signal region. The design method is also described for the idle current of the diode bias-feed circuit in a small-signal region from the points-of-view of NF and P1 dB. The effectiveness of the dual bias-feed circuit is evaluated by simulation and measurement. The fabricated 2-GHz-band dual bias-feed LNA has the P1 dB improvement of 5 dB and no degradation NF compared with the conventional resistor bias-feed LNA.
Sponsorship	IEEE Microwave Theory and Techniques Society
Starting Page	414
Ending Page	421
Page Count	8
File Size	851010
File Format	PDF
ISSN	00189480
Volume Number	51
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-02-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Circuit synthesis Silicon germanium Germanium silicon alloys Heterojunction bipolar transistors Low-noise amplifiers Diodes Resistors Noise measurement Degradation Noise figure
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electrical and Electronic Engineering Radiation

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Dual bias feed SiGe HBT low noise linear amplifier

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