Funded by BMBF, eesy-ic offers a digitally controlled frequency synthesizer for FMCW radar systems. Based on an All-Digital Phase Locked Loop, it generates a very stable frequency modulated signal in the range of 12 GHz to 12.5GHz which can be configured via an SPI interface. Fast and linear chirps are the groundwork for high precision positioning. The chirp duration is adjustable from 0.1ms to 10ms and the modulation frequency is programmable up to 500 MHz with 24 Bits resolution. An integrated software controlled measurement of the oscillator’s frequency characteristic triggers a linearization that makes highly linear frequency ramps possible. Phase noise and modulation speed can be optimized with the aid of two-point modulation and a programmable loop filter. Additionally, an FSK modulation enables the exchange of data between two radar stations.