The modulated signals are added up in a summator 120 to form a real signal, which is filtered by a RF filter 122 for attenuating out-of-band noise and spurious interference.

• 在加法器120中将调制的信号相加形成实信号，该信号通过RF滤波器122滤波，以衰减带外噪声和伪干扰。