Feed-forward phase noise/spur cancellation

Patent metadata

Field	Value
Publication number	US-2019028092-A1
Application number	US-201815863779-A
Country	US
Kind code	A1
Filing date	Jan 5, 2018
Priority date	Jul 20, 2017
Publication date	Jan 24, 2019
Grant date	—

Abstract

An open-loop feed-forward auto-correlator phase noise and spur cancellation device includes a clock source to generate a clock signal with noise and/or spurs. The device also includes a phase auto-correlator coupled to an output of the clock source to generate a delayed clock signal and to auto-correlate the clock signal and the delayed clock signal to generate an auto-correlated control signal at an output of the phase auto-correlator. The device further includes a signal control delay line coupled to the output of the phase auto-correlator to modulate a phase of the clock signal based on the auto-correlated control signal to cancel the noise and/or spurs generated by the clock source. The signal control delay line includes a supply voltage regulator and a clock distribution network.

First claim

What is claimed is:

1 . An open-loop feed-forward auto-correlator phase noise and spur cancellation device, comprising:
a phase auto-correlator coupled to an output of a clock source to receive a clock signal with noise and/or spurs, to generate a delayed clock signal and to auto-correlate the clock signal and the delayed clock signal to generate an auto-correlated control signal at an output of the phase auto-correlator; and a signal control delay line coupled to the output of the phase auto-correlator to modulate a phase of the clock signal based at least in part on the auto-correlated control signal to cancel the noise and/or spurs generated by the clock source.

2 . The open-loop feed-forward auto-correlator phase noise and spur cancellation device of claim 1 , in which the clock distribution network comprises a global clock distribution network that is shared between different circuits.

3 . The open-loop feed-forward auto-correlator phase noise and spur cancellation device of claim 1 , in which the clock distribution network comprises a local clock distribution network for the open-loop feed-forward auto-correlator phase noise and spur cancellation device.

4 . The open-loop feed-forward auto-correlator phase noise and spur cancellation device of claim 1 , further comprising a filter coupled between the phase auto-correlator and the signal control delay line to filter the auto-correlated control signal.

5 . The open-loop feed-forward auto-correlator phase noise and spur cancellation device of claim 1 , further comprising a combiner to combine the auto-correlated control signal with a reference signal, in which modulation is based at least in part on the reference signal and the auto-correlated control signal.

6 . The open-loop feed-forward auto-correlator phase noise and spur cancellation device of claim 1 , in which the supply voltage regulator comprises a low drop out (LDO) regulator.

7 . The open-loop feed-forward auto-correlator phase noise and spur cancellation device of claim 1 , in which the clock distribution network comprises at least one buffer.

8 . The open-loop feed-forward auto-correlator phase noise and spur cancellation device of claim 1 , incorporated in timing circuitry for an analog-to-digital converter (ADC), a digital-to-analog converter (DAC), a central processing unit (CPU), a receive block of a wireless communication device or a transmit block of the wireless communication device.

9 . The open-loop feed-forward auto-correlator phase noise and spur cancellation device of claim 1 , in which the signal delay line comprises a supply voltage regulator and/or a clock distribution network

10 . A method to achieve feed-forward phase noise/spur cancellation, comprising:
receiving a clock signal including noise and/or spurs; generating a delayed clock signal by a phase auto-correlator; auto-correlating the clock signal and the delayed clock signal to generate an auto-correlated control signal at an output of the phase auto-correlator; and modulating, by a signal control delay line, a phase of the clock signal based at least in part on the auto-correlated control signal to cancel the noise and/or spurs generated by the clock source.

11 . The method to achieve feed-forward phase noise/spur cancellation of claim 10 , further comprising filtering the auto-correlated control signal.

12 . The method to achieve feed-forward phase noise/spur cancellation of claim 10 , further comprising combining the auto-correlated control signal with a reference signal, in which the modulating is based at least in part on the reference signal and the auto-correlated control signal.

13 . The method to achieve feed-forward phase noise/spur cancellation of claim 10 , implemented using an open-loop feed-forward auto-correlator phase noise and spur cancellation device.

14 . The method to achieve feed-forward phase noise/spur cancellation of claim 12 , further comprising incorporating the open-loop feed-forward auto-correlator phase noise and spur cancellation device in timing circuitry for an analog-to-digital converter (ADC), a digital-to-analog converter (DAC), a central processing unit (CPU), a receive block of a wireless communication device or a transmit block of the wireless communication device.

15 . An open-loop feed-forward auto-correlator phase noise and spur cancellation device, comprising:
a clock source to generate; a phase auto-correlator coupled to an output of a clock source to receive a clock signal with noise and/or spurs, to generate a delayed clock signal and to auto-correlate the clock signal and the delayed clock signal to generate an auto-correlated control signal at an output of the phase auto-correlator; and means for modulating a phase of the clock signal based at least in part on the auto-correlated control signal to cancel the noise and/or spurs generated by the clock source.

16 . The open-loop feed-forward auto-correlator phase noise and spur cancellation device of claim 15 , further comprising a filter coupled between the phase auto-correlator and the modulating means to filter the auto-correlated control signal.

17 . The open-loop feed-forward auto-correlator phase noise and spur cancellation device of claim 15 , further comprising a combiner to combine the auto-correlated control signal with a reference signal, in which modulation is based at least in part on the reference signal and the auto-correlated control signal.

18 . The open-loop feed-forward auto-correlator phase noise and spur cancellation device of claim 15 , in which the device is incorporated in timing circuitry for an analog-to-digital converter (ADC), a digital-to-analog converter (DAC), a central processing unit (CPU), a receive block of a wireless communication device, or a transmit block of the wireless communication device.

19 . The open-loop feed-forward auto-correlator phase noise and spur cancellation device of claim 15 , in which the converting means comprises at least one buffer.

20 . The open-loop feed-forward auto-correlator phase noise and spur cancellation device of claim 15 , in which the converting means comprises a global clock distribution network that is shared between different circuits.

21 . The open-loop feed-forward auto-correlator phase noise and spur cancellation device of claim 15 , in which the converting means comprises a local clock distribution network for the open-loop feed-forward auto-correlator phase noise and spur cancellation device.

22 . The open-loop feed-forward auto-correlator phase noise and spur cancellation device of claim 15 , in which the modulating means comprising means for regulating voltage of the modulating means and/or means for converting a signal to a phase domain.

Assignees

• Qualcomm Inc

Inventors

• Lu Yue
• Chen Zuow-Zun
• Yang Jeongsik

Classifications

• H03K5/159

  Applications of delay lines not covered by the preceding subgroups · CPC title

• H03K5/1252 Primary

  Suppression or limitation of noise or interference (specially adapted for transmission systems H04B15/00, H04L25/08) · CPC title

• H03L7/08

  Details of the phase-locked loop · CPC title