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1. US20180219704 - Clock data recovery with non-uniform clock tracking

Office
United States of America
Application Number 15422050
Application Date 01.02.2017
Publication Number 20180219704
Publication Date 02.08.2018
Grant Number 10084621
Grant Date 25.09.2018
Publication Kind B2
IPC
H03D 3/18
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
DDEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
3Demodulation of angle-modulated oscillations
02by detecting phase difference between two signals obtained from input signal
18by means of synchronous gating arrangements
H03D 3/24
HELECTRICITY
03BASIC ELECTRONIC CIRCUITRY
DDEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
3Demodulation of angle-modulated oscillations
02by detecting phase difference between two signals obtained from input signal
24Modifications of demodulators to reject or remove amplitude variations by means of locked-in oscillator circuits
H04L 25/03
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25Baseband systems
02Details
03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
H04L 12/26
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
12Data switching networks
02Details
26Monitoring arrangements; Testing arrangements
H04L 27/00
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
27Modulated-carrier systems
CPC
H04L 2027/0069
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
27Modulated-carrier systems
0014Carrier regulation
0044Control loops for carrier regulation
0063Elements of loops
0069Loop filters
H04L 25/03273
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
25Baseband systems
02Details
03Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
03006Arrangements for removing intersymbol interference
03178Arrangements involving sequence estimation techniques
03248Arrangements for operating in conjunction with other apparatus
03273with carrier recovery circuitry
H04L 43/16
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
43Arrangements for monitoring or testing packet switching networks
16using threshold monitoring
Applicants QUALCOMM Incorporated
Inventors Yu Song
Zhi Zhu
Miao Li
Li Sun
Deqiang Song
Chia Heng Chang
Agents Loza & Loza, LLP/Qualcomm
Title
(EN) Clock data recovery with non-uniform clock tracking
Abstract
(EN)

Systems and methods for adjusting a phase step size of a clock data recover (CDR) circuit are described according to aspects of the present disclosure. In certain aspects, a method for adjusting a phase step size of a CDR circuit includes sensing a frequency offset of the CDR circuit, and adjusting the phase step size of the CDR circuit based on the sensed frequency offset. The frequency offset may be sensed by sensing a signal level on an integration path of a loop filter of the CDR circuit. The phase step size of the CDR circuit may be adjusted by switching the CDR circuit between a first phase step size and a second phase step size using a modulator (e.g., a sigma-delta modulator).