Patents Assigned to Hyperband Communications, Inc.
  • Patent number: 7408395
    Abstract: Fast settling circuits and methods designed to align input signal amplitude level and to remove DC offset voltages with minimal loss of low frequency signal in receiving analog circuits are disclosed. With the key innovative circuits and methods for signal peak alignment, the disclosed circuits and methods achieve fast settling without significant attenuation of the input signal. Peak aligning circuits and methods can be implemented along with conventional RC AC coupling circuits. In applying the aligning circuits and methods to differential signal pair, DC offsets can be easily removed.
    Type: Grant
    Filed: May 1, 2003
    Date of Patent: August 5, 2008
    Assignee: Hyperband Communication, Inc.
    Inventors: Kanyu Cao, Yiping Fan, Hongyu Li, Chieh-Yuan Chao
  • Patent number: 7366227
    Abstract: In a spread spectrum system, methods and despreader architectures for despreading the received spreaded codes with the use of a single correlator and a single correlation code is provided. Before despreading the incoming received spreaded codes, a single correlation code is generated using a symbol from a set of symbols that has been mapped into a set of differential encoded PN codes. Despreading output samples for each received spreaded code are obtained by correlating the received spreaded code with this single correlation code. Correlation is accomplished by multiplying each received sample of the received spreaded codes with the correlation code samples and accumulating the products of this multiplication. After correlation, the index for the maximum or minimum peak of the despreading output samples for each code is identified. This index can then be mapped into a symbol corresponding to the transmitted information.
    Type: Grant
    Filed: June 23, 2004
    Date of Patent: April 29, 2008
    Assignee: Hyperband Communications, Inc.
    Inventors: Syang-Myau Hwang, Yiping Fan, Chen-Yi Chang, Hongyu Li, Chieh-Yuan Chao
  • Patent number: 6784727
    Abstract: A fast-setting DC offset removal circuit with continuous cutoff frequency switching is disclosed. In the preferred embodiment, the circuit is implemented using a pair of RC filters for receiving a differential signal pair and a continuous, variable resistance control circuit. The control circuit can be current-controlled or voltage controlled to provide fast settling of the received signal and the removal of the DC offset components. Additionally, by using a current-controlled control circuit, the cutoff frequency of the RC filter can be ramped from high to low in a continuous manner, thereby minimizing the generation of DC offsets.
    Type: Grant
    Filed: May 21, 2003
    Date of Patent: August 31, 2004
    Assignee: Hyperband Communication, Inc.
    Inventors: Kanyu Cao, Tung-Shan Chen, Hongyu Li, Chieh-Yuan Chao