DARPA has awarded an 18-month Phase II contract to HRL Laboratories LLC of Malibu, Calif., for continued work on the COSMOS program. COSMOS, or Compound Semiconductor Materials on Silicon, will focus on improving the yield and density of the heterogeneous interconnect process using the HRL 400-GHz, 250-nm indium phosphide heterojunction bipolar transistor process combined with commercial 130-nm CMOS technology.