MULTIPLE FREQUENCY SIGNAL AMPLITUDE AND PHASE MODULATOR Russian patent published in 2008 - IPC H03C5/00 

FIELD: radio engineering.

SUBSTANCE: invention can be used for shaping of phase-shift keyed, amplitude-shift keyed and amplitude-phase-shift keyed signals. Modulator contains high-frequency signal source, uncontrolled section designed as reactive four-pole network, controlled section parallel to low-frequency control signal source, load for multiple frequency line signal with random impedances at three intended frequencies. Controlled section is executed in the form of three-polar controlled element; reactive four-pole network is executed in the form of symmetric T-shaped connection of three reactive two-pole networks. Two-pole networks of reactance X_1k, X_2k, X_3k of symmetric T-shaped connection are executed from series circuit L_n, C_n, parallel to inductance L_0n. Reactances of two-pole networks on each of three intended frequencies ω_k are chosen by mathematical expressions from formula of invention.

EFFECT: provided amplitude and phase manipulation and line signal amplitude amplification within specified number of fixed frequencies with manipulator switched between random resistances.

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