Читать книгу Handbook of Microwave Component Measurements - Joel P. Dunsmore - Страница 73

Frequency dividers provide for a lower value of frequency than the input frequency. Like multipliers they are highly non‐linear and often produce square‐wave outputs. Some key specifications of dividers are minimum and maximum input power to ensure proper operation of the divider, output power and harmonics, and additive phase noise. Typically, for each divide by two stage, the phase noise is reduced by 6 dB. But noise or jitter in the divide circuitry can add noise to the signal; the added phase noise at the output relative to the phase noise at the input is called additive phase noise. This is also a concern with mixers, where the LO phase noise can be added to the output signal, and to a lesser extent amplifiers.