Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1986-12-15
1989-01-31
Grimm, Siegfried H.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
329 50, 329135, 329204, 332 18, 332 21, 375 39, 375 60, 375 99, H04L 2720, H04L 2722
Patent
active
048018996
ABSTRACT:
A modulation device using multi-level digital signals includes: a pair of balanced mixers for carrying out quadrature amplitude modulation to deliver a quadrature amplitude modulated signal; input and output hybrid circuits, connected to carrier input terminals of the pair of balanced mixers, for supplying carrier inputs to the pair of balanced mixers; and a modulation characteristic compensation unit connected with input terminals of the pair of balanced mixers for supplying the pair of balanced mixers with orthogonal baseband input signals. A demodulation device with a use of multi-level digital signals including: a pair of balanced mixers for carrying out quadrature amplitude demodulation to deliver a pair of quadrature amplitude demodulated signals; first and second input hybrid circuits; and a demodulation characteristic compensation unit connected with output terminals of the pair of balanced mixers for deriving demodulation characteristic compensated orthogonal baseband signals from the pair of quadrature amplitude demodulated signals.
REFERENCES:
patent: 4581748 (1986-04-01), Sasaki et al.
patent: 4633484 (1986-12-01), Takeda et al.
Fujutsu Limited
Grimm Siegfried H.
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