A High Linearity Process Angle Interference Resistant Multi-phase Output Digital Control Oscillator with Negative Feedback

In this paper, we have proposed a high linearity process angle interference resistant multi-phase output digital control oscillator with negative feedback. The proposed digital control oscillator uses negative feedback structure to improve the output frequency linearity and resist process angle interference, while this paper optimizes and designs the circuit for the digital control current source differential cross-coupling structure basic delay unit, negative feedback structure. The DCO mentioned has beenimplemented in standard 130nm CMOS. The DCO designed in this paper has 8-phase output with frequency tuning in the range of 0.2 GHz-2.5 GHz and gain in the range of 2.14 MHz/LSB-5.5 MHz/LSB, with good linearity. At 1.5 GHz, the process leads to a frequency jitter size of only 6.6%, which has the property of resistance to process corner interference. The cycle integration jitter is 2.79ps, and the power consumption is 1.65mW.