Dynamic reference frequency for fractional-N Phase-Locked Loop

摘要: Within a receiver, the frequency of comparison reference clock signal supplied to fractional-N Phase-Locked Loop (PLL) is dynamically changed such that undesirable reciprocal mixing spurs with known jammers (for example, transmit leakage) minimized. As channel changes within band, and as leakage changes, circuit generated by PLL are moved in so they do not reciprocally mix transmitter ways. In second aspect, operable either an integer-N or PLL. low total receive power situations, operates reduce receiver susceptibility spurs. third jammer detect information used determine frequency.