Modulators – Phase shift keying modulator or quadrature amplitude modulator
Patent
1995-03-28
1996-10-01
Mis, David
Modulators
Phase shift keying modulator or quadrature amplitude modulator
332163, 333117, 361790, 455111, H03C 100, H03C 300
Patent
active
055614019
ABSTRACT:
The present invention has an object to provide a compact quadrature modulator manufactured at low cost in such a manner that an input level is low over a wide high frequency band, and few input signals are wrapped around an output terminal. The quadrature modulator is mainly constructed of a multi-layer substrate into which a 90-degree phase shifter is assembled, a semiconductor integrated modulator circuit into which two sets of 2-phase modulators and an output signal in-phase synthesizing circuit, and a lid. The multi-layer substrate is constructed of "n" pieces of layers in total, namely from a first substrate corresponding to an uppermost layer to an n-th substrate corresponding to a lowermost layer. The first substrate layer is a layer for assembling a semiconductor integrated circuit, or a layer for connecting a substrate with a semiconductor integrated circuit. The 90-degree phase shifter is constituted by distributed coupling circuits having wavelengths of .lambda.g/4 by both of wiring patterns formed on the substrates corresponding to an intermediate layer of the multi-layer substrate. A wiring pattern connected to a ground terminal and other circuit components are formed on the n-th substrate layer, i.e., the lowermost layer.
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G. Flower et al., "QPSK Modulators for Digital Cellular Communication", IEEE 1992 Bipolar Circuits and Technology Meeting 3.2, Jul. 10, 1992, pp. 59-62.
P. Weger et al., "Digital Phase-Shift Quadrature Frontend For Lo-Inputs Up to 6 GHz", Proceedings of 20th European Microwave Conference, Sep. 1990, pp. 424-428.
K. Yamamoto et al., "A 1.9-GHz-Band GaAs Direct-Quadrature Modulator IC with a Phase Shifter", IEEE Journal of Solid State Circuits, vol. 28, No. 10, Oct. 1993, pp. 994-1000.
Mis David
NEC Corporation
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