Differential VCO with Diodes Feedback Using InGaP/GaAs HBT Technology

This paper presents on-chip base collector (BC) diodes feedback voltage controlled (VCO) using InGaP/GaAs HBT technology for interference cancellation system (AF-ICS). The VCO achieved a low phase noise of - 131.04 ㏈c/㎐ at 1 ㎒ offset from the carrier frequency of 1.540 ㎓ with output power of -11.26 ㏈m when supplying the controlled voltage of 1.9 V. A tuning range of 141 ㎒ is achieved with integrated tuning BC diodes.