Modulators – Amplitude modulator – Plural modulation
Patent
1991-04-02
1992-03-10
Grimm, Siegfried H.
Modulators
Amplitude modulator
Plural modulation
332162, 332178, 455108, H03C 154
Patent
active
050952900
ABSTRACT:
Modulator circuit (MOD) with a modulator proper and a correction signal generator. The modulator proper comprises the cascade connection of an amplifier (T11, T21, CS11, T12, T22, CS12) and a first switching circuit (R11, T31, T51, R12, T32, T52), while the generator comprises the cascade connection of the same amplifier and a second switching circuit (R21, T61, T42, R22, T62, T41) having a correction output (P11, P12) coupled to a feedback input (P21, P22) of the amplifier via a feedback circuit (T71, R31, CS21, T72, R32, CS22). The amplifier and the switching circuits are controlled by a modulating signal and a carrier signal respectively and the first and second switching circuits provide a modulated output signal and a correction signal substantially equal to the envelope of the modulated output signal and used to decrease the modulator distortion.
REFERENCES:
patent: 4547752 (1985-10-01), Shinbara
Sevenhans Joannes M. J.
Vanden Abeele Erik M. R.
ALCATEL N.V.
Grimm Siegfried H.
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