Circuit configuration for direct modulation

Details Circuit configuration for direct modulation Circuit configuration for direct modulation

2006-01-03

2006-01-03

Corsaro, Nick (Department: 2684)

Telecommunications

Transmitter

Plural modulation

C455S112000, C455S113000

Reexamination Certificate

active

06983131

ABSTRACT:
A circuit configuration for direction modulation contains an oscillator, whose output signal is split into quadrature components for modulation with a useful signal. A frequency shifting circuit has the effect that that the output frequency and the frequency of the oscillator are fractional rational multiples with respect to one another. The circuit contains a phase shifter for generating first further quadrature components and also a divider for generating second further quadrature components. The quadrature components are mixed with one another. As a result of the frequency offset, the oscillation frequency of the oscillator is shifted to outside the useful frequency band. Remodulation effects do not influence the adjacent channels. The circuit can be realized simply and cost-effectively and, in particular, requires only one oscillator.

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