Chih Wei Wong

US Patent:

20120236510, Sep 20, 2012

Filed:

Mar 18, 2011

Appl. No.:

13/051946

Inventors:

Chih Wei Wong - Irvine CA, US

Assignee:

Navman Wireless OEM Solutions LP - Foothill Ranch CA

International Classification:

H05K 7/02
H05K 3/30

US Classification:

361748, 29832

Abstract:

A system and method of making an apparatus for managing heat distribution in an oscillator system is disclosed. In an example embodiment, the apparatus includes a resonator configured to provide a periodic signal, a circuit coupled to the resonator configured to compensate for changes in the periodic signal due to variation in temperature, and further includes a heat source configured to generate heat that heats the resonator and the circuit. At least one of the resonator, circuit, and heat source is embedded in a substrate, and the resonator, circuit, and heat source are arranged to heat the resonator and circuit substantially the same amount.

US Patent:

20190064264, Feb 28, 2019

Filed:

Sep 7, 2018

Appl. No.:

16/125046

Inventors:

- Irvine CA, US
Chih Wei Wong - Irvine CA, US

International Classification:

G01R 31/317
H02M 3/158
H02M 1/44
H01P 1/22

Abstract:

A circuit arrangement and methods for reducing a time domain noise signature (switching noise jitter (SNJ) signature) in output and feedback paths of a feedback control loop circuitry having a transistor switching stage switching an output signal at one or more predetermined frequencies are disclosed. In an example, the circuit arrangement has a feedback control loop circuitry including a first means, a common connection junction, one or more signal terminals, one or more rails and a passive signal conditioning means. The passive signal conditioning means including the rails is closely coupled to the common connection junction and is characterized by a set of specified characteristics to condition pre-existing noise amplitude and slopes of an analog signal having a plurality of noise carrying jittering ramps. The set of specified characteristics is configured to provide substantial attenuation to the pre-existing noise amplitude in specified low and high frequency bands and steepen the slopes of the noise carrying jittering ramps with the substantially attenuated noise amplitude of the analog signal so as to improve the interactions between the analog signal and the feedback control loop circuitry, thereby the SNJ signature, which is produced by transient noise displacement or noise perturbation in the time domain when the analog signal jitters, can be reduced in the output and feedback paths of the feedback control loop circuitry, notwithstanding the fact that the signal conditioned analog signal still jitters. In another example, the set of specified characteristics of the passive signal conditioning means includes a first substantial predetermined signal conditioning equivalent series resistance (ESR). In another example, the circuit arrangement further comprises a frequency domain filter part disposed farther than the passive signal conditioning means from the common connection junction, and a ratio of the first substantial predetermined signal conditioning ESR to the corresponding ESR of the frequency domain filter part is characterized to be substantially greater than 1. In another example, the passive signal conditioning means comprises a selected filter or capacitor denoted as X2Y, of which is characterized to satisfy the set of specified characteristics. In another example, the frequency domain filter part comprises at least three terminals.

US Patent:

20190006937, Jan 3, 2019

Filed:

Sep 7, 2018

Appl. No.:

16/125068

Inventors:

- Irvine CA, US
Chih Wei Wong - Irvine CA, US

International Classification:

H02M 1/14
H02M 3/156
H03M 1/08

Abstract:

A time and frequency domain signal conditioning device for reducing a time domain noise signature (switching noise jitter (SNJ) signature) in output and feedback paths of a feedback control loop circuitry having a transistor switching stage switching an output signal at one or more predetermined frequencies and methods of making the same are disclosed. In an example, the time and frequency domain signal conditioning device (SNJ conditioning device) has one or more signal terminals, one or more rails and a passive signal conditioning means. The passive signal conditioning means including the rails is characterized by a set of specified characteristics to condition pre-existing noise amplitude and slopes of an analog signal having a plurality of noise carrying jittering ramps. The set of specified characteristics is configured to provide substantial attenuation to the pre-existing noise amplitude in specified low and high frequency bands and steepen the slopes of the noise carrying jittering ramps with the substantially attenuated noise amplitude of the analog signal so as to improve the interactions between the analog signal and the feedback control loop circuitry when the time and frequency domain signal conditioning device provides the conditioned analog signal to cooperate with the feedback control loop circuitry, thereby the SNJ signature, which is produced by transient noise displacement or noise perturbation in the time domain when the analog signal jitters, can be reduced in the output and feedback paths of the feedback control loop circuitry, notwithstanding that fact that the signal conditioned analog signal still jitters. In another example, the set of specified characteristics of the passive signal conditioning means includes a first substantial predetermined signal conditioning equivalent series resistance (ESR). In another example, the time and frequency domain signal conditioning device further comprises a frequency domain filter part disposed farther than the passive signal conditioning means from the rails, and a ratio of the first substantial predetermined signal conditioning ESR to the corresponding ESR of the frequency domain filter part is characterized to be substantially greater than 1. In another example, the passive signal conditioning means comprises a selected filter or capacitor denoted as X2Y, of which is characterized to satisfy the set of specified characteristics. In another example, the frequency domain filter part comprises at least three terminals.

US Patent:

20170033468, Feb 2, 2017

Filed:

Oct 14, 2016

Appl. No.:

15/294048

Inventors:

- Irvine CA, US
Chih Wei Wong - Irvine CA, US

International Classification:

H01Q 15/00
H01Q 19/00
H01Q 1/38

Abstract:

This invention enables Frequency Selective Surface (“FSS”) and Artificial Magnetic Conductor (“AMC”) which exhibits Electromagnetic Band Gap (“EBG”) in any of the substrate's layer from a small and thin systems and sub-systems in package to a large-format PCBs. The metamaterial substrate may be integrated with electronic circuit components or buried in PCBs for circuit designs capable of transmitting, receiving and reflecting electromagnetic energy, altering electromagnetic properties of natural circuit materials, enhancing electrical characteristics of electrical components (such as filters, antennas, baluns, power dividers, transmission lines, amplifiers, power regulators, and printed circuits elements) in systems and sub-systems circuit designs. The metamaterial substrate creates new electrical characteristics, properties and systems, sub-systems or component's specification not readily available with conventional circuit materials, substrates, and PCBs. The metamaterial substrate can be less than 70 μm thick and buried into any PCB layer.