ZHIHENG CAO
Pilots at Sierra Raton Rd, Irvine, CA
License number
California A5282866
Issued Date
Dec 2015
Expiration Date
Dec 2020
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
19491 Sierra Raton Rd, Irvine, CA 92603
Professional information
High Amplitude Voltage-Controlled Oscillator With Dynamic Bias Circuit
US Patent:
8493156, Jul 23, 2013
Filed:
Jun 6, 2011
Appl. No.:
13/154314
Inventors:
Zhiheng Cao - Irvine CA, US
Assignee:
Broadcom Corporation - Irvine CA
International Classification:
H03B 5/12, H03L 5/00
US Classification:
331117FE, 331173, 331183, 331185
Abstract:
According to an exemplary embodiment, a high amplitude oscillation generator includes an LC tank circuit, a gain stage, a dynamic bias circuit, a bias current source, and a dynamic bias circuit receiving a current source feedback voltage and outputting a gain stage bias voltage. The dynamic bias circuit adjusts the gain stage bias voltage in response to a change in the current source feedback voltage after a start up of the LC tank circuit. The dynamic bias circuit thereby increases an amplitude of oscillations produced by the oscillation generator. The dynamic bias circuit can include an error amplifier, the error amplifier generating the gain stage bias voltage responsive to the current source feedback voltage. The current source feedback voltage can change with a voltage drop across the bias current source. The current source feedback voltage can also be received from an output of the oscillation generator.
Method And Apparatus For Energy Efficient And Low Maintenance Cost Wireless Monitoring Of Physical Items And Animals From The Internet
US Patent:
2013018, Jul 18, 2013
Filed:
Jan 12, 2012
Appl. No.:
13/349521
Inventors:
Zhiheng Cao - Irvine CA, US
International Classification:
G08B 13/14
US Classification:
3405721
Abstract:
Method and an apparatus for giving notifications such as sound, ring-tone, vibration, e-mails, text messages, or phone calls to users when a physical item such as doors, gates, windows, cars, or household items have been moved from its original location, or has its orientation changed, comprising a tag manager connected to the Internet, and one or more sensor tags coupled to the tag manager through wireless connection. Notifications may also be given when the physical item has returned to its original orientation. Notifications may also be given when communication link is disrupted. Methods are provided to reduce power consumption of each sensor tag sufficiently to allow powered solely from an energy harvesting unit, such as one comprising a solar panel, without requiring need of battery maintenance. The users may configure and control the tag manager and each sensor tag, and issue commands to each sensor tag, from the Internet.
Method And Apparatus For Preventing Person, Animals Or Items From Getting Lost
US Patent:
2012015, Jun 21, 2012
Filed:
Dec 18, 2010
Appl. No.:
12/972467
Inventors:
Zhiheng Cao - Irvine CA, US
Qingqi Dou - Irvine CA, US
Qingqi Dou - Irvine CA, US
International Classification:
G08B 1/08
US Classification:
34053913
Abstract:
Methods and apparatus for giving audible warning to a user when one or more accompanying person, animal or personal item is physically more than a predetermined distance away from the user, have a master tag and one or more slave tags, wherein said master tag is wirelessly coupled to each one of said slave tags, said master tag and said slave tag being capable of being conveniently carried by a person or being attached to an animal or a personal item.