公开(公告)号：US12249997B2

公开(公告)日：2025-03-11

申请号：US17338497

申请日：2021-06-03

Applicant: Intel Corporation

Inventor： Somnath Kundu ,  Hao Luo ,  Brent Carlton

IPC: H03L7/099

Abstract: An apparatus and method are provided to re-configure an existing low-jitter phase locked loop (PLL) circuit for fast start-up during system wake-up. During system start-up, a feed-back path of the PLL is disconnected to independently control the VCO frequency. This independently controlled VCO then injects energy into a resonator (e.g., a crustal oscillator) for its fast start-up. Once a resonance frequency of the resonator is detected and an oscillation builds up in the resonator, a VCO control voltage is stored. The PLL feedback is then restored and the stored VCO control voltage is applied to perform phase-locking operation. Since the PLL control voltage is already set to the desired operating point, the PLL lock time is very small.

公开(公告)号：US20240137029A1

公开(公告)日：2024-04-25

申请号：US17970477

申请日：2022-10-19

Applicant: Intel Corporation

Inventor： Hao Luo ,  Somnath Kundu ,  Brent R. Carlton

IPC: H03L7/099 ,  H03L7/093

CPC classification number: H03L7/0992 ,  H03L7/093 ,  H03L2207/50

Abstract: Embodiments herein relate to a sampling phase-locked loop (PLL) with a compensation circuit for reducing ripples due to the use of a fractional N divider. The compensation circuit includes a ripple amplifier and a ripple divider. The ripple amplifier receives an output voltage, Vmain, of a main sampling circuit of the PLL and amplifies its alternating current (AC) components. The amplified output voltage is provided to a ripple integrator which samples the minimum and maximum values to provide inputs to an operational amplifier (op amp). An output of the op amp is fed back to a digital-to-analog converter (DAC), which provides a corresponding compensation voltage, Vcomp. Vcomp is added to Vmain to provide a final output control voltage, Vctrl, to control a voltage-controlled oscillator (VCO) of the PLL.

公开(公告)号：US20240007050A1

公开(公告)日：2024-01-04

申请号：US17854534

申请日：2022-06-30

Applicant: Intel Corporation

Inventor： Timo Huusari ,  Mohamed A. Abdelmoneum ,  Brent R. Carlton ,  Somnath Kundu ,  Hao Luo ,  Sarah Shahraini ,  Jason Mix ,  Eduardo Alban

IPC: H03B5/36 ,  H03B5/06

CPC classification number: H03B5/36 ,  H03B5/06 ,  H03B2200/0094

Abstract: An apparatus, system, and method for multi-frequency oscillator control are provided. A circuit can include a resonator circuit including an input and an output, the resonator circuit configured to resonate at a fundamental frequency and a different, non-fundamental frequency, a startup circuit electrically coupled to the input, the startup circuit configured to generate a signal at about the non-fundamental frequency and detect when the resonator circuit is resonating at the non-fundamental frequency, and an oscillator driver circuit electrically coupled to the output, the oscillator driver circuit configured to amplify and buffer the output of resonator circuit and drive a load.

公开(公告)号：US11205995B2

公开(公告)日：2021-12-21

申请号：US16833298

申请日：2020-03-27

Applicant: Intel Corporation

Inventor： Brent Carlton ,  Hao Luo ,  Somnath Kundu

IPC: H03B5/06 ,  H03B5/12 ,  H03B5/36

Abstract: An apparatus injects a start clock to a crystal at the beginning to increase an overall start up speed of the crystal. The apparatus relies on an impedance change inside the crystal itself instead of searching for a synchronization on the yet small crystal oscillation. The apparatus includes an oscillator (separate from the crystal) to search for the crystal's resonance frequency by detecting the crystal's impedance change. Once the frequency of the oscillator matches the crystal's resonance, there is significant change in the crystal's impedance. Using that information, the apparatus can lock the oscillator frequency at the crystal resonance frequency and inject the clock with high efficiency.

公开(公告)号：US20210305939A1

公开(公告)日：2021-09-30

申请号：US16833298

申请日：2020-03-27

Applicant: Intel Corporation

Inventor： Brent Carlton ,  Hao Luo ,  Somnath Kundu

IPC: H03B5/06 ,  H03B5/36 ,  H03B5/12

Abstract: An apparatus injects a start clock to a crystal at the beginning to increase an overall start up speed of the crystal. The apparatus relies on an impedance change inside the crystal itself instead of searching for a synchronization on the yet small crystal oscillation. The apparatus includes an oscillator (separate from the crystal) to search for the crystal's resonance frequency by detecting the crystal's impedance change. Once the frequency of the oscillator matches the crystal's resonance, there is significant change in the crystal's impedance. Using that information, the apparatus can lock the oscillator frequency at the crystal resonance frequency and inject the clock with high efficiency.