The HMC643 is a 6-bit digital phase shifter die which is rated from 9 to 12 GHz, providing 360 degrees of phase coverage, with a LSB of 5.625 degrees. The HMC643 features very low RMS phase error of 3.5 degrees and extremely low insertion loss variation of 0.6 dB across all phase states. This high accuracy phase shifter is controlled with complementary logic of 0/-3V, and requires no fixed bias voltage and is internally matched to 50 Ohms with no external components. Simple external level shifting circuitry can be used to convert a positive CMOS control voltage into complementary negative control signals.