Modulators – Phase shift keying modulator or quadrature amplitude modulator – Including discrete semiconductor device
Patent
1992-11-25
1994-05-10
Mis, David
Modulators
Phase shift keying modulator or quadrature amplitude modulator
Including discrete semiconductor device
329305, 329306, 455214, 455337, 307321, 328208, H03C 300, H03D 300
Patent
active
053111516
ABSTRACT:
An IQ modulator/demodulator wherein the 90.degree. phase quadrature branches of an input signal are connected to different terminals of a common bridge, from which also the quivalents I and Q signals are obtained. To the bridge is also connected a local oscillator signal through a transformer. The transformer can be replaced with an active circuit, whereby the entire demodulator can be implemented in the form of an integrated circuit.
REFERENCES:
patent: 4367560 (1983-01-01), Hallford
patent: 4801899 (1989-01-01), Ashida
patent: 5006811 (1991-04-01), Kruger
patent: 5153536 (1992-10-01), Muller
patent: 5214397 (1993-05-01), Muller
patent: 5214796 (1993-05-01), Gorrie et al.
patent: 5231364 (1993-07-01), Mucke
Microwave Journal, vol. 26, No. 1, Jan. 1983, Dedha, Mass. US, pp. 99-109, Don Neuf and Steve Spohrer: "Conventional and New Applications for the Quadrature If Microwave Mixer".
IEEE Microwave and Millimeter-Wave Monolithic Circuits Symposium, 1988, May, New York, U.S.A., pp. 71-74, Pavio et al.
Finnish Office Action Dated 9 Oct. 1992 For Priority Document 915892, And English Translation Thereof.
Mis David
Nokia Mobile Phones Ltd.
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