Modulators – Phase shift keying modulator or quadrature amplitude modulator – Including discrete semiconductor device
Patent
1990-12-14
1992-10-06
Grimm, Siegfried H.
Modulators
Phase shift keying modulator or quadrature amplitude modulator
Including discrete semiconductor device
332152, 332164, 332168, 332172, 332177, 375 39, 375 43, 375 61, 455 46, 455109, 455327, 455330, 455332, H03C 114, H03C 158, H04L 2720
Patent
active
051535360
ABSTRACT:
A modulator suitable for 16 quadrature amplitude modulation (QAM) is designed as a double modulator (1), wherein a 16 QAM modulator (39) consists of two double modulators (1). One double modulator (1) has two partial modulators (1',1") forming a bridge. Each partial modulator (1',1") has two possible transmission paths: (6',6") with a phase delay line (39',39") which causes a 180.degree. phase shift. On each of the two paths (6',6", 7',7"), a semiconductor diode (D.sub.1 ',D.sub.1 ",D.sub.2 ',D.sub.2 ") is disposed in such a way that they provide the carrier (U.sub.c) with a 180.degree. phase inversion and are accordingly rendered conductive in unison, if no modulation voltage (U.sub.m) is applied, whereby the carrier is suppressed at the signal output (3'). When a modulation signal (U.sub.m) is applied, the balance is changed to push-pull, and one of the two paths (6',6") assumes less impedance compared to the other path (7',7"), which leads to the generation of the modulated carrier voltage (U.sub.mc). Through its design as a double modulator (1) such that the transmission path is realized respectively via an electrically short path (7',7") of one partial modulator (1',1") and via a phase delay path (6",6') of the other partial modulator (1',1") or conversely, differences in the two paths are averaged. The double push-pull modulator (1) is used in radio link systems. The modulator (1) can also be used as a mixer.
REFERENCES:
patent: 4249263 (1981-02-01), Shinkawa et al.
patent: 4509208 (1985-04-01), Sogo et al.
Alcatel N. V.
Grimm Siegfried H.
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