Modulators – Phase shift keying modulator or quadrature amplitude modulator – Including discrete semiconductor device
Patent
1992-06-24
1993-07-27
Grimm, Siegfried H.
Modulators
Phase shift keying modulator or quadrature amplitude modulator
Including discrete semiconductor device
333124, 333138, 375 39, 455304, H04L 2736, H03H 719, H03H 748
Patent
active
052313646
ABSTRACT:
A phaseshift network (2) exhibits approximately equal impedances to the outputs of an IQ mixer (10), over a range of modulation frequencies (Fm). The phaseshift network furthermore exhibits an approximately equal time delay for the I and Q modulated signals propagating therethrough. The phaseshift network includes a first branch having an input node for receiving a first frequency signal that varies within a range of frequencies about a frequency Fo. The first branch includes a phaseshifter for providing a frequency signal representative of the first input signal that is retarded by a first predetermined number of degrees. The phaseshift network further includes a second branch having an input node for receiving a second frequency signal that varies within a range of frequencies about the frequency Fo. The second branch includes a phaseshifter for providing a frequency signal representative of the second input signal that is advanced by a second predetermined number of degrees. A summer sums together the retarded and advanced frequency signals for providing, at an output node, an output signal that is a summation of the retarded and the advanced frequency signals.
REFERENCES:
patent: 3891980 (1975-06-01), Lewis et al.
patent: 4200849 (1980-04-01), Malocha
patent: 4737968 (1988-04-01), Norton et al.
patent: 5077542 (1991-12-01), Lanoiselee
Grimm Siegfried H.
Nokia Mobile Phones Ltd.
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