Patent ID: 9655130
Date: 2017-05-16
CPC Classifications: H04B,H04W

Claim:
1. Circuitry for any of a transceiver, a transmitter, and a receiver, the circuitry comprising: radio frequency (RF) circuitry; digital circuitry; a carrier signal generator; a clock generator to generate a digital clock for clocking the digital circuitry; and a fallback oscillator, wherein the RF circuitry is susceptible to interference from harmonics of the clocking of the digital circuitry, wherein the carrier signal generator is coupled to provide a carrier signal to the RF circuitry, wherein the clock generator is arranged to derive a frequency of the digital clock based on a frequency divided down from a frequency of the carrier signal such that the interference to the RF circuitry occurs at frequencies that are harmonics of the carrier signal wherein the fallback oscillator generates a fallback reference frequency, wherein the clock generator has a fallback selector to select the fallback reference frequency as a source from which to generate the digital clock when the carrier frequency is not wherein the fallback selector has a monitor to monitor a stability of the carrier signal, and wherein the fallback selector is operable to select the fallback reference frequency depending on the stability of the carrier signal.