Patents by Inventor Christopher J. Strobel

Christopher J. Strobel has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6625433
    Abstract: An automatic gain control (AGC) system controls a receiver having multiple amplifier stages with near constant compression. The AGC system controls gain, and thus compression, of each stage employing information generated by the other stages to generate feedback signals at a system level. A central controller uses threshold detection to monitor signal power at each stage of the receiver signal path as well as overall signal gain. Based on these various signal power measurements, the central controller adjusts signal gain of the input to one or more stages, while maintaining overall signal gain for a constant output signal level. The AGC function may be implemented by switching the gain of each stage's variable amplifier in discrete steps in discrete steps, with the step size being coarser for stages closer to the input signal than those closer to the final output baseband signal.
    Type: Grant
    Filed: September 29, 2000
    Date of Patent: September 23, 2003
    Assignee: Agere Systems Inc.
    Inventors: John R. Poirier, Christopher J. Strobel
  • Patent number: 6348816
    Abstract: Tracking percent overload signal as an indicator of output signal magnitude is achieved by measuring the percent of time the envelope of a varying modulated signal is above a predetermined programmable threshold. The technique is implemented by a level detector including an envelope detector along with circuitry for detecting when the envelope has exceeded the programmable threshold. The output of the level detector is sampled and fed to a counter which provides a digital output which indicates the percentage of time the envelope exceeds the set threshold.
    Type: Grant
    Filed: December 28, 2000
    Date of Patent: February 19, 2002
    Assignee: Agere Systems Guardian Corp.
    Inventors: Joseph H. Havens, Bruce W. McNeill, Christopher J. Strobel
  • Patent number: 6341219
    Abstract: An automatic and adjustable power control method and apparatus for optimally controlling the output power of a CDMA handset is provided. The method and apparatus utilize a single control signal to automatically control the gain of two frequency diverse variable gain stages of a transmitting portion of the handset by a multi-point hand-off technique. The multi-point hand-off technique partially varies the gain of a first stage to satisfy key system constraints and hands-off control to a second stage. The gain of the second stage is varied to satisfy additional system constraints. A second hand-off is performed so that the gain of the first stage may be varied again to maintain the optimal power control.
    Type: Grant
    Filed: February 5, 1999
    Date of Patent: January 22, 2002
    Assignee: Agere Systems Guardian Corp.
    Inventors: John R. Poirier, Christopher J. Strobel