公开(公告)号：US11283426B2

公开(公告)日：2022-03-22

申请号：US16956960

申请日：2017-12-29

Applicant: Apple Inc.

Inventor： Igal Kushnir ,  Harry Skinner ,  Bernhard Raaf ,  Sharon Malevsky ,  Gil Horovitz

IPC: H03H9/46 ,  H04B1/12 ,  H03B5/36 ,  H04B1/40

Abstract: An electrical device (100) that comprises at least one signal filter (104) comprising a plurality of mechanical resonators (106 108, 110) in a substrate (102) and at least one further mechanical resonator (112) in the substrate (102) configured to oscillate at a reference frequency of an oscillator signal. An electrical system (300) comprising an electrical oscillator (306) a transceiver (302) and an antenna (310), and an electrical device (100). A method (1300) for providing an electrical device (100).

公开(公告)号：US11005481B2

公开(公告)日：2021-05-11

申请号：US16204109

申请日：2018-11-29

Applicant: Apple Inc.

Inventor： Evgeny Shumaker ,  Gil Horovitz

IPC: H03L7/14 ,  H03L7/087 ,  H03L7/099 ,  H03L7/18 ,  H04L27/00

Abstract: A phase locked loop (PLL) system for mitigating non-linear phase errors stemming from time-variant integral non-linearity of the LO feedback phase quantizer (TDC) is disclosed. The system includes a phase modulation circuit which is configured to generate a plurality of phase shifts for a reference signal; select a phase shift of the plurality of phase shifts and introduce the selected phase shift into the reference signal, thereby modulating the phase difference between the feedback and the reference signal. Alternatively, the above phase modulation can be applied on the feedback signal path, attaining equivalent results. TDC is configured to quantize the phase of the LO feedback signal relative to the shifted reference signal to generate a phase detection signal, effectively modulating the non-linearity contributed error away from the LO center frequency. The phase detection signal is then digitally compensated for the intentional fractional frequency shift to allow the PLL to generate LO signal the desired frequency.

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.