Yi Kai Chang

US Patent:

20120121004, May 17, 2012

Filed:

Nov 17, 2010

Appl. No.:

12/948447

Inventors:

Yi Cheng Chang - Tempe AZ, US

Assignee:

FREESCALE SEMICONDUCTOR, INC. - Austin TX

International Classification:

H04L 27/01

US Classification:

375232

Abstract:

An embodiment of an equalizer includes a voltage-to-current converter and a current-to-voltage converter. The voltage-to-current converter is configured to convert a differential input voltage to a differential current, and includes a differential amplifier with a first transistor and a second transistor, and a first source degeneration circuit coupled between the first transistor and the second transistor. An embodiment of the first source degeneration circuit includes a first resonant circuit. The current-to-voltage converter is coupled to the voltage-to-current converter, and is configured to convert the differential current to a differential output voltage. The current-to-voltage converter includes a first inverter with a first feedback circuit and a second inverter coupled to the first inverter, which includes a second feedback circuit. An embodiment of the first feedback circuit includes a second resonant circuit, and an embodiment of the second feedback circuit includes a third resonant circuit.

US Patent:

20120286887, Nov 15, 2012

Filed:

May 10, 2011

Appl. No.:

13/104449

Inventors:

YI CHENG CHANG - Tempe AZ, US

International Classification:

H03B 5/02

US Classification:

331108 R

Abstract:

A voltage controlled oscillator includes a plurality of serially connected composite gain stages. A composite gain stage includes a transconductance stage and a transimpedance stage. The transconductance stage has first and second current paths from a first power supply voltage terminal to a second power supply voltage terminal. A first variable resistance is coupled between the first and second current paths. The transimpedance stage has a first inverter and a second inverter. The first inverter has an input terminal coupled to the output of the first current path and an output terminal. The second inverter has an input terminal coupled to the output of the second current path, and an output terminal. A second variable resistance is coupled between the input terminal and the output terminal of the first inverter, and a third variable resistance is coupled between the input terminal and the output terminal of the second inverter.

US Patent:

20170310307, Oct 26, 2017

Filed:

Apr 22, 2016

Appl. No.:

15/135622

Inventors:

- AUSTIN TX, US
Miguel MENDEZ - Tlaquepaque, MX
Yi Cheng CHANG - Chandler AZ, US

International Classification:

H03K 3/012
H03K 3/354
H03K 3/03

Abstract:

An integrated circuit includes a first portion of a stacked ring oscillator coupled between a first supply voltage node and a common node, wherein the first supply voltage node provides a local supply voltage for the first portion and the common node provides a local ground for the first portion. The integrated circuit includes a second portion of the stacked ring oscillator coupled between the common node and a second supply voltage node wherein the common node provides a local supply voltage for the second portion and the second supply voltage node provides a local ground for the second portion. The integrated circuit also includes a voltage divider having a first resistive element coupled between the first supply node and the common node and a second resistive element coupled between the common node and the second supply node.

US Patent:

20170068805, Mar 9, 2017

Filed:

Sep 8, 2015

Appl. No.:

14/847742

Inventors:

- Sunnyvale CA, US
Keiko Horiguchi - Palo Alto, JP
Amanda Joy Stent - Chatham NJ, US
Jeffrey Kuwano - San Jose CA, US
Achint Oommen Thomas - Milpitas CA, US
Yi Chang - Milpitas CA, US

International Classification:

G06F 21/32
G06F 3/16

Abstract:

One or more techniques and/or systems are provided for audio verification. An audio signal, comprising a code for user verification, may be identified. A second audio signal is created comprising speech. The audio signal and the second audio signal may be altered to comprise a same or similar volume, pitch, amplitude, and/or speech rate. The audio signal and the second audio signal may be combined to generate a verification audio signal. The verification audio signal may be presented to a user for the user verification. Verification may be performed to determine whether the user has access to content or a service based upon user input, obtained in response to the user verification audio signal, matching the code within the user verification audio signal. In an example, the user verification may comprise verifying that the user is human.