NDLI: AM suppression with low AM-PM conversion with the aid of a variable-gain amplifier

Content Provider	IEEE Xplore Digital Library
Author	Klumperink, E.A.M. Klein, C.T. Ruggeberg, B. van Tuijl, E.J.M.
Copyright Year	1966
Abstract	This paper proposes the use of a variable-gain amplifier instead of a hard limiter for amplitude modulation (AM) suppression with low AM-PM (phase modulation) conversion. A hard limiter shows phase shift variations through input-amplitude dependent changes in output waveform, combined with bandwidth limitations. It is shown that these can be kept small only for limiter bandwidths much larger than the input frequency. A linear amplifier with variable gain used for AM suppression does not suffer from this problem. A CMOS variable-gain amplifier with gain-insensitive phase shift has been designed for this purpose. The benefits and limitations of the technique are explored with reference to an experimental 2.5 /spl mu/m BiCMOS chip for a television IF demodulator. Experimental and simulation results indicate that the AM-PM conversion can be kept below 0.5/spl deg/ at 40 MHz over an input amplitude range of 20 dB, where typical hard limiters show 3-5/spl deg/. This is achieved with an amplifier bandwidth of 80 MHz, while a hard limiter would need a bandwidth of more than 600 MHz to obtain similar results.
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	625
Ending Page	633
Page Count	9
File Size	1143973
File Format	PDF
ISSN	00189200
Volume Number	31
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-05-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Optical amplifiers Circuits Demodulation Bandwidth TV Amplitude modulation Phase modulation Gain Clocks Band pass filters
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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AM Suppression with Low AM-,PM Conversion with the Aid of a Variable-Gain Amplifier

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