Apparatus and method for frequency translation in a communicatio

Details Apparatus and method for frequency translation in a communicatio Apparatus and method for frequency translation in a communicatio

1995-03-20

1998-09-01

Williams, Howard L.

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

375279, H03M 164

Patent

active

058016546

ABSTRACT:
A frequency translation device in a first embodiment includes a plurality of multiplying digital-to-analog converters (MDACs) that multiply an input signal by phase shifted digital sinewave approximation signals to perform frequency translation. In the preferred embodiment the input includes inphase and quadrature phase components, one of which is multiplied by a digital sinewave approximation and the other is multiplied by a digital cosinewave approximation. The use of the multiple MDACs with differing sinewave approximation signals provides a signal that multiplies the input signal such that the effects of odd harmonics at an output are mitigated while the advantages of a traditional switching mixer are retained.

REFERENCES:
patent: 4142241 (1979-02-01), Freilich et al.
patent: 4727752 (1988-03-01), Peters
patent: 5150121 (1992-09-01), Newell et al.
patent: 5668842 (1997-09-01), Sorace et al.

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