Patent ID: 6477182
Filing Date: 2002-11-05
Classification: H03D,H04B

Abstract:
An upconverter, comprising:a plurality of modulators for modulating respective information signals onto respective intermediate frequency carrier signals, said respective IF carrier signals being separated by a predetermined frequency; a summation module, for summing said plurality of IF carrier signals to produce a stacked IF carrier signal: a first mixer and first filter, for spectrally shifting and filtering said stacked IF carrier signal to a first radio frequency (RF) range determined by a first oscillator signal; and a second mixer and second filter, for spectrally shifting and filtering information within said first RF range to one of a plurality of spectral portions within a second RF range to produce an upconverted signal, said second RF range determined by a second oscillator signal and comprising frequencies less than said first RF range and greater than said IF carrier signals, said second oscillator signal comprising a selectable oscillator signal.