Читать книгу Handbook of Microwave Component Measurements - Joel P. Dunsmore - Страница 108

Mixers have much lower unwanted spurious responses compared to sampler‐based receivers. The primary spurious (or unintended) conversion occurs at the IF image of the desired RF signal. If the RF is above the LO (low‐side mixing), the image will be one IF below the LO (hi‐side mixing). Because mixers used as VNA receivers have lower noise floor and lower spurious responses, a much wider class of measurements that can be performed including noise figure, two‐tone IMD, and even some modulated measurements.