丌 B M2混频器 f vs2(t)=vs cos(ast VI2(t)=v, cos o,t g2(1)=g0+2∑ gn cosmo,t 丌 n2(t)=g1sc0s(01 i,2(t)=gIs cos[20, t-(ost-o)=82 s cos((L0L OS)(+33 M2混频器 ) 2 ( ) cos( 2  vS t =VS S t − v t V t L L L ( ) cos 2 =   = = + 1 2 0 ( ) 2 cos n n L g t g g n t ) 2 ( ) cos( 2 1  i i f t = g VS i f t − ] 2 )] cos[(2 ) 2 ( ) cos[2 ( 2 2 2     i i t = g VS L t − S t − = g VS L − S t + if f L f S f A 2  2  2  2  M1 M2 B C