Design and characterization of a microwave feed-forward amplifier with improved wide-band distortion cancellation

A new approach to the design of a wide-band feed-forward amplifier (FFAMP) is presented in this paper. Phase equalizers are employed in an FFAMP to match the nonlinear delay/phase characteristics of the main and error amplifiers, improving phase balances within the cancellation loops and providing i...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2001-01, Vol.49 (1), p.200-203
Main Authors: Hau, Y.K.G., Postoyalko, V., Richardson, J.R.
Format: Article
Language:English
Subjects:
Bandwidth
Broadband amplifiers
Circuits
Delay
Equalizers
Feedforward systems
Frequency
Microwave amplifiers
Nonlinear distortion
Phase distortion
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Summary:A new approach to the design of a wide-band feed-forward amplifier (FFAMP) is presented in this paper. Phase equalizers are employed in an FFAMP to match the nonlinear delay/phase characteristics of the main and error amplifiers, improving phase balances within the cancellation loops and providing improvement in signal cancellations over a wide bandwidth. The proposed 1.7-1.9-GHz FFAMP was fabricated and characterized. The conventional FFAMP obtains an average of 15-dB third-order intermodulation (IM3) distortion cancellation over the whole bandwidth. With the phase equalizers, the proposed FFAMP achieves a further 6-dB reduction on IM3 level.
ISSN:0018-9480
1557-9670
DOI:10.1109/22.900009