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.
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Tenders are invited for Supply of machinery/ equipment/ amplitude modulation and Demodulation, phase modulation, balanced modulator, demodulator circuits, qpsk modulator and Demodulator chemicals/computer/ peripherals and accessories etc.
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 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.
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.
The overall voltage transmission coefficient of the balanced modulator is given by
Hence, with two single-stage modulators connected in tandem to realize the balanced modulator, the total voltage reflection coefficient of the circuit is expressed as
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.
The four quadruant phase shift was produced by two type SBL-1 balanced modulators and a 90[degrees] hybrid.

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