Down-converted Spectrum Figure 4.10.Downconversion of two channels for (a)@Lo<@1,(b)@Lo slightly above @1,(c)@Lo midway between @1 and w2,and (d)@Lo>02. [View full size image] -02 +01 +0 +02 -0L0 =0o 9 -204 1+ (a) +0 +LO -0 +01-L0 0 0 -01+0儿0Down-converted Spectrum