公开(公告)号：US10938396B2

公开(公告)日：2021-03-02

申请号：US16352043

申请日：2019-03-13

Applicant: Apple Inc.

Inventor： Abhishek Agrawal ,  Alon Cohen ,  Gil Horovitz ,  Somnath Kundu ,  Run Levinger ,  Stefano Pellerano ,  Jahnavi Sharma ,  Evgeny Shumaker ,  Izhak Hod

IPC: H03L7/081 ,  H03L7/083

Abstract: A quadrature based voltage controlled oscillator (VCO) local oscillator (LO) system is disclosed. The system includes a phase detector, a quadrature phase VCO, a quadrature control path, an in-phase control path, and an in-phase VCO. The phase detector is configured to compare and generate phase error between a reference clock and an in-phase VCO output. The quadrature control path configured to generate a quadrature control voltage based on a quadrature VCO output and the in-phase VCO output. The quadrature phase VCO configured to generate the quadrature VCO output based on the quadrature control voltage and the generated phase error. The in-phase control path configured to generate an in-phase control voltage based on the quadrature VCO output and the in-phase VCO output. The in-phase VCO is configured to generate the in-phase VCO output based on the in-phase control voltage and the generated phase error. An all digital dual mode phase locked/phase tracking loop LO generate system is also disclosed.