balanced modulator

balanced modulator

[′bal·ənst ′maj·ə‚lād·ər]
(electronics)
A modulator in which the carrier and modulating signal are introduced in such a way that the output contains the two sidebands without the carrier.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The IF is DC coupled so the mixer can be utilized for balanced modulator applications.
The balanced modulator topology requires a total of four couplers, one each for the input and output and one within each single-stage branch.
THE BALANCED MODULATOR'S DESIGN AND MEASURED PERFORMANCE
The balanced modulator using reflection-type attenuators is an extremely robust technique that provides perfect BPSK performance with negligible design effort.
Although in a balanced modulator it is possible to remove the amplitude and phase errors caused by the parasitics of the cold-pHEMT, the resulting circuit would in theory be double the size of the original single-stage design.
The balanced modulator configuration employs two reflection-type single-ended modulators in a push-pull fashion, which can be combined by employing a pair of 3 dB, 90 [degrees] couplers.[14,15] The input signal is effectively split in a balun and the modulating baseband signal is split into a pair of complementary signals.
If the two cold-FET terminations in each branch were fed with complementary but otherwise identical baseband control signals, the resulting balanced modulator would produce near-perfect amplitude and phase balance.
While designing balanced modulators and mixers, proper models for the Schottky diodes in the form of a ring or a bridge must also be used.
From this concept came the realization of a host of basic circuit function modules, including multiport power combiners and dividers, mixers, balanced modulators, signal path switches, circulators, frequency doublers, phase inverters and active inductors.[2,3] Performance of these circuits has been demonstrated beyond 20 GHz.
This pulse is fed to the I/Q phase discriminators (two type SBL-1 balanced modulators).

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