Citta Microelectronics has developed its own 77GHz ACC radar chipset solution, including three chipsets, a 2-channel transmitter (CM77T), a 2-channel receiver (CM77R), and a frequency generator (CM25V). All chips are designed and fabricated in the same world class SiGe BiCMOS technology, and packaged in wafer level fan-out package. This arrangement allows us to integrate the whole transceiver into a single SoC if there is such need. A 3-times frequency multiplifier has been integrated into the TX and RX chips, which allows 25.5GHz LO signal to drive the front-end, effectively reducing the PCB inter-connection loss. The 25GHz VCO source, CM25V, can drive up to 16 TX channels and 32 RX channels simutaniously due to the power margin of the 25GHz VCO. All TX and RX channels can be controlled seperately, facilitating system designs.

All three packages are smaller than 3.2 X 3.6 mm2. They can be directly soldered onto a PCB, avoiding the loss and uncertainty of conventional bondwire packages. The signal source VCO has integrated programmable frequency devider, where the divider ratio can be set to ÷2、÷4、÷8 or ÷512. According to their system spec, the system designers can easily realize different frequency modulation schemes, e.g. fractional PLL, open loop frequency modulation, DDS ect.