## Answer 1.9

#### The dc offset in the mixer can be viewed as an additional dc component within the input data signal, which will mix with the carrier component and result in what is usually termed carrier leakage at the mixer output in the centre of the modulation spectrum as shown below.
Carrier leakage occurs due to the carrier in high frequency mixing processes simply feeding across the small gap between the local oscillator input and mixer output, because of insufficient isolation.