A radiation hardened low-noise voltage-controlled-oscillator using negative feedback based multipath- current-releasing technology

Abstract

A radiation harden low-noise voltage controlled oscillator is demonstrated in this paper. By using negative feedback based multipath-current-releasing technology, the anti-radiation capability of the bias circuit of VCO is largely increased. A compatible current steers are used to reduce the gain of VCO. The cascade structure of inverter is used to suppress the intrinsic noise and power supply noise. By increasing the output resistance of current steers with the cascade structure, the supply noise is suppressed. A modified inverter delay stage is designed to reduce the intrinsic noise of VCO. The simulation results of VCO would achieve 108.6dBc/Hz@1MHz. The peak value of turbulence of bias circuits may reduce to 1/8 compared to the original value at least.