NDLI: A GaAs monolithic true logarithmic amplifier for 0.5 to 4 GHz applications

Content Provider	IEEE Xplore Digital Library
Author	Smith, M.A.
Copyright Year	1988
Description	Author affiliation: Texas Instrum. Inc., Dallas, TX, USA (Smith, M.A.)
Abstract	A GaAs monolithic dual-gain amplifier stage for 0.5 to 4 GHz logarithmic amplifier applications was developed and tested. A cascade of six of these stages resulted in a true logarithmic amplifier with a 70-dB dynamic range, operational across this band. A stage gain of 10 dB was chosen for each of two 'arms' in the dual-gain circuit, but because of -6-dB resistive combiner was used, the gains of both amplifier arms were increased 6 dB. The first arm has 12.7-dB gain and a saturated output power of -8 dBm, and the second arm has 6-dB gain and a saturated output power of +11 dBm. A thin-film network external to the monolithic circuit contains the -6-dB resistive combiner in which the outputs of the two amplifier arms are combined to provide the linear gain of 10 dB at low power levels. The stage gain asymptotically approaches 0 dB as input power is increased. Additional circuit elements printed on the thin-film network are two shorted stubs for gain shaping and one series transmission line to equalize the insertion phase between the two paths.
Starting Page	37
Ending Page	40
File Size	384840
Page Count	4
File Format	PDF
DOI	10.1109/MCS.1988.197284
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1988-05-24
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Gallium arsenide Arm Gain Power generation Power amplifiers Thin film circuits Circuit testing Operational amplifiers Dynamic range Power transmission lines
Content Type	Text
Resource Type	Article

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