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DAC5686IPZP Datasheet(PDF) 18 Page - Texas Instruments |
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DAC5686IPZP Datasheet(HTML) 18 Page - Texas Instruments |
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18 / 46 page  www.ti.com + + + − I Q DAC DAC A B LO Quadrature Modulator DAC5686 cos( ωct) sin( ωct) –sin( ωct) –cos( ωct) A(t) = I(t)cos( ωct) – Q(t)sin(ωct) B(t) = –I(t)sin( ωct) – Q(t)cos(ωct) cos( ωLOt) sin( ωLOt) 0 ° 90 ° IF(t) = I(t)cos( ωc+ ωLO)t – Q(t)sin( ωc+ ωLO)t 0 0 ω c ω ω ω ω LO ω LO – ωc ω LO + ωc Real Input Spectrum to DAC5686 Complex Input Spectrum to Quadrature Modulator Output Spectrum to Quadrature Modulator DAC5686 SLWS147B – APRIL 2003 – REVISED AUGUST 2004 DETAILED DESCRIPTION (continued) Figure 20. DAC5686 in SSB Mode With Quadrature Modulator Figure 21. Spectrum After First and Second Up-Converson for Real Input 18 |
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