INTEGRATED CIRCUIT COMPRISING FREQUENCY GENERATION CIRCUITRY FOR CONTROLLING A FREQUENCY SOURCE

摘要

An integrated circuit (805) comprises frequency generation circuitry (800) for controlling a frequency source (810) for use in an automotive radar system. The frequency generation circuitry (800) comprises low-path modulation circuitry arranged to generate a first, low-path control signal (817) for providing lower frequency modulation of the frequency source (810), the low-path modulation circuitry comprising a Phase Locked Loop (PLL) (815) arranged to generate the low- path control signal (817) for controlling the frequency source (810) and a fractional-N divider (820) located within a feedback loop of the PLL (815), and frequency pattern control module (825) operably coupled to the fractional-N divider (820) and arranged to control the fractional-N divider (820), by way of at least a first, lower frequency pattern control signal (835). The frequency generation circuitry (800) further comprises high-path modulation circuitry arranged to generate a second, high-path control signal (847) for providing higher frequency modulation of the frequency source (810).