A SET-Tolerant High-Frequency Multibiased Multiphase Voltage-Controlled Oscillator for Phase Interpolator-Based Clock and Data Recovery

A high-frequency multibiased multiphase voltage-controlled oscillator (MBM-VCO) for clock and data recovery is proposed. The operating frequency of the voltage-controlled oscillator (VCO) ranges from 2.1 to 5.5 GHz. The sensitivity of the VCO to bias is reduced through multibias technology and interleaving bias, while the ability to single-event transient (SET) tolerance of the ring oscillator is improved through layout hardening. Laser experiments show that the threshold value of the proposed MBM-VCO is greatly improved. Ion experiments further show a SET tolerance under linear energy transfers (LETs) of 83.7 MeV $\,\cdot $ cm ² /mg.