NDLI: The MICROMIXER: a highly linear variant of the Gilbert mixer using a bisymmetric Class-AB input stage

Content Provider	IEEE Xplore Digital Library
Author	Gilbert, B.
Copyright Year	1966
Abstract	This paper outlines the basic theory of a development of the Gilbert mixer. The bipolar junction transistor (BJT) differential pair widely used as the RF input stage is replaced by a bisymmetric Class-AB topology based on translinear principles. It does not have inherent gain compression, affording a greatly extended signal capacity. The linearity of variants of the basic form is excellent, providing two-tone intermodulation intercepts as high as +30 dBm, without the expenditure of high bias currents. It can operate on supplies as low as 2.2 V, with a power consumption of under 5 mW. The input impedance of this mixer is accurately controllable (typically 50 /spl Omega/) and provides a true broadband match. The noise figure depends on design details and is generally not as low as in mixers specifically optimized for noise performance, although acceptable for many receiver applications. Inductively degenerated variants can be tuned to a narrowband match at microwave frequencies and provide full-mixing SSB noise figures as low as 6.5 dB, Practical realizations are in use in applications to 1.9 GHz.
Sponsorship	IEEE Solid-State Circuits Society IEEE Electron Devices Society IEEE Circuits and Systems Society Japan Society of Applied Physics (JSAP) IEEE Microwave Theory and Techniques Society IEEE San Francisco Section Bay Area Council Univ. PA IEEE
Starting Page	1412
Ending Page	1423
Page Count	12
File Size	386926
File Format	PDF
ISSN	00189200
Volume Number	32
Issue Number	9
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1997-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Noise figure Radio frequency Topology Linearity Energy consumption Impedance Design optimization Narrowband Microwave frequencies Amplitude modulation
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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