Pulse or digital communications – Transmitters – Angle modulation
Reexamination Certificate
2007-04-17
2007-04-17
Vo, Don N. (Department: 2611)
Pulse or digital communications
Transmitters
Angle modulation
Reexamination Certificate
active
10701978
ABSTRACT:
A signal transmitter for sending a radio signal is made up of an input for receiving input data and a first circuit for generating an inphase signal and a quadrature signal from the input data. A second circuit produces a first signal associated with a cosine of a first frequency and a third circuit that produces a second signal associated with a sine of the first frequency. A first modulator, coupled to the first circuit and the second circuit, upconverts the inphase signal with the first signal and produces a first upconverted signal. A second modulator, coupled to the first circuit and the third circuit, upconverts the inphase signal with the second signal and produces a second upconverted signal. A third modulator, coupled to the first circuit and the second circuit, upconverts the quadrature signal with the first signal and produces a third upconverted signal. A fourth modulator, coupled to the first circuit and the third circuit, upconverts the quadrature signal with the second signal and produces a fourth upconverted signal. A fourth circuit, coupled to the first and fourth modulators, combines the first upconverted signal and the fourth upconverted signal into a first intermediate signal. A fifth circuit, coupled to the second and third modulators, combines an inverse of the second upconverted signal and the third upconverted signal into a second intermediate signal. A quadrature modulator, coupled to the fourth circuit and the fifth circuit, converts the first intermediate signal and the second intermediate signal to an output signal. The output signal has a component at a first sideband of a second frequency, the first sideband frequency offset from the second frequency by a first amount. A filter, coupled to the quadrature modulator, passes the first sideband, and filters the second frequency and a second sideband, the second sideband offset from the second frequency by the inverse of the first amount.
REFERENCES:
patent: 4816783 (1989-03-01), Leitch
patent: 5412351 (1995-05-01), Nystrom et al.
patent: 6535073 (2003-03-01), Garg et al.
patent: 2003/0141938 (2003-07-01), Poklemba et al.
Arad Oren
Fanfelle Robert
Rakib Shlomo
Terayon Communications Systems, Inc.
Thelen Reid Brown Raysman & Steiner LLP
Vo Don N.
LandOfFree
System and method for an improved quadrature upconverter for... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System and method for an improved quadrature upconverter for..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System and method for an improved quadrature upconverter for... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3763231