Patents by Inventor Clinton C Powell

Clinton C Powell 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: 6570938
    Abstract: A signal processor (125) for recovering data symbols from a received signal includes matched filters (210, 215) for receiving and filtering a quadrature (Q) signal component of the received signal. A detector (225) is coupled to the matched filters (210, 215) for selecting a filtered signal provided by one of the matched filters (210, 215) and for labeling the filtered signal according to a magnitude and phase of the filtered signal to provide a Q channel output flag. A Q channel symbol/sign decoder (235) then processes the Q channel output flag to generate a Q channel magnitude variable and a polarity variable, and a symbol decoder (240) coupled to the Q channel symbol/sign decoder (235) generates a data symbol in accordance with the Q channel magnitude variable and the polarity variable.
    Type: Grant
    Filed: May 1, 1996
    Date of Patent: May 27, 2003
    Assignee: Motorola, Inc.
    Inventors: Joseph Boccuzzi, Clinton C Powell, II
  • Patent number: 6560447
    Abstract: A DC offset correction circuit (68) provides DC offset correction within a receiver (50) for receiving and processing a radio frequency signal (28) within a radio communication system (30). The DC offset correction circuit (68) includes a feedback loop (88) for shifting a digital signal (80) by a programmable amount; and a coarse DC offset correction path (104) coupled to the feedback loop (88) for performing coarse DC offset correction.
    Type: Grant
    Filed: March 5, 2001
    Date of Patent: May 6, 2003
    Assignee: Motorola, Inc.
    Inventors: Mahibur Rahman, Christopher T. Thomas, Robert Schweickert, James Mittel, Clinton C. Powell, II
  • Publication number: 20020179930
    Abstract: A composite semiconductor structure includes islands of noncompound semiconductor materials formed on a noncompound substrate, and an optical testing structure. In one embodiment, a scan chain runs through the noncompound substrate (and possibly also through the islands) and terminates in the islands at optical interface elements, one of which is an optical emitter and the other of which is an optical detector. A test device inputs test signals to, and reads test signals from, the scan chain by interfacing optically with the optical interface elements. In another embodiment, an optical detector is formed in the silicon substrate and an optical emitter is formed in the compound semiconductor material. A leaky waveguide communicating with the emitter overlies the detector, and detection by the detector of light emitted by the emitter is an indication of the absence of an intended circuit element between the detector and the leaky side of the waveguide.
    Type: Application
    Filed: June 1, 2001
    Publication date: December 5, 2002
    Applicant: MOTOROLA, INC.
    Inventors: James S. Irwin, Clinton C. Powell, Timothy J. Johnson, Kevin B. Traylor, Duane C. Rabe, Barbara Foley Barenburg
  • Publication number: 20020182762
    Abstract: High quality epitaxial layers of monocrystalline materials can be grown overlying monocrystalline substrates such as large silicon wafers by forming a compliant substrate for growing the monocrystalline layers. One way to achieve the formation of a compliant substrate includes first growing an accommodating buffer layer on a silicon wafer. The accommodating buffer layer is a layer of monocrystalline oxide spaced apart from the silicon wafer by an amorphous interface layer of silicon oxide. The amorphous interface layer dissipates strain and permits the growth of a high quality monocrystalline oxide accommodating buffer layer. The accommodating buffer layer is lattice matched to both the underlying silicon wafer and the overlying monocrystalline material layer. Any lattice mismatch between the accommodating buffer layer and the underlying silicon substrate is taken care of by the amorphous interface layer.
    Type: Application
    Filed: May 30, 2001
    Publication date: December 5, 2002
    Applicant: MOTOROLA INC.
    Inventor: Clinton C. Powell
  • Patent number: 6487260
    Abstract: A full serial implementation of a M-level correlation based demodulator (100) includes a two's complement, pass-through, zero-out complex conjugate multiplier element (102), a boxcar filter (104) coupled to the multiplier element, a complex magnitude approximater element (106) coupled to the boxcar filter and a maximum value and index holding element (108). The multiplier element reuses common products along an M-level of cross-correlation to reduce multiplication functions at a rate 2 times M faster than a sampling rate at an input of the demodulator.
    Type: Grant
    Filed: April 5, 1999
    Date of Patent: November 26, 2002
    Assignee: Motorola, Inc.
    Inventors: Robert K. Schweickert, Mahibur Rahman, Christopher T. Thomas, Clinton C Powell, II
  • Publication number: 20020151289
    Abstract: A DC offset correction circuit (68) provides DC offset correction within a receiver (50) for receiving and processing a radio frequency signal (28) within a radio communication system (30). The DC offset correction circuit (68) includes a feedback loop (88) for shifting a digital signal (80) by a programmable amount; and a coarse DC offset correction path (104) coupled to the feedback loop (88) for performing coarse DC offset correction.
    Type: Application
    Filed: March 5, 2001
    Publication date: October 17, 2002
    Inventors: Mahibur Rahman, Christopher T. Thomas, Robert Schweickert, James Mittel, Clinton C. Powell
  • Patent number: 6263014
    Abstract: A method (200) of decoding a multi-level synchronous protocol having a first portion encoded as M/2-level signals and a subsequent portion encoded as M/2-level signal or M-level signals, wherein the M/2-level signals have expected larger than normal variation of deviations includes steps of decoding (202) the first portion using a biased mode which uses M correlators shifted (204) to adequately cover the frequency range of the expected larger than normal variation of deviations and determining (206) from decoding of the first portion whether the subsequent portion is the M/2-level or M-level signal. If a M/2-level signal is found, continue decoding (210) in the biased mode. If it's the M-level signal, then decoding continues in standard mode (214), which uses M correlators that are spaced in frequency to match M spectral deviations within a predetermined frequency range.
    Type: Grant
    Filed: September 3, 1998
    Date of Patent: July 17, 2001
    Assignee: Motorola, Inc.
    Inventors: Chun-Ye Susan Chang, Clinton C Powell, II, Craig P. Wadin
  • Patent number: 6178210
    Abstract: A selective call receiver unit (700) capable of reducing data distortion and improving simulcast reception includes a selective call receiver (20), a demodulator (30) coupled to the selective call receiver and a circuit (36 and 300) coupled to the demodulator for reducing data distortion received at a selective call receiver. The circuit includes a detector (350) for detecting a simulcast signal, a filter (351) for windowing the symbol edge area in the simulcast signal providing a windowed symbol edge area, and a clipping circuit (36) for clipping the windowed symbol edge area.
    Type: Grant
    Filed: March 6, 1998
    Date of Patent: January 23, 2001
    Assignee: Motorola
    Inventors: Ronald A. Craig, Clinton C. Powell, II, Dalier J. Ramirez, Stephen R. Carsello
  • Patent number: 6130921
    Abstract: A method (900) and circuit (400) for automatic frequency correcting a frequency modulated (FM) digital signal determines a frequency offset value of the detected FM signal during a preamble portion of the FM digital signal, generates an offset corrected signal by removing the frequency offset value from a detected FM signal (440), and generates a frequency corrected signal (460). The frequency corrected signal is generated by selecting the offset corrected signal during the preamble portion, selecting the detected FM signal after the end of the preamble portion when a magnitude of the frequency offset value of the detected FM signal is below a predetermined threshold (445), and otherwise selecting the offset corrected signal after the end of the preamble portion.
    Type: Grant
    Filed: December 23, 1997
    Date of Patent: October 10, 2000
    Assignee: Motorola, Inc.
    Inventors: Clinton C Powell, II, James Rodney Webster
  • Patent number: 6130920
    Abstract: A circuit (12) for symbol decision directed feedback synchronization includes a current synchonization clock (45) that provides an initial sampling point and selects a detector corresponding to a current symbol decision. The circuit further includes a plurality of detectors (31, 32, 33, and 34) including the detector corresponding to the current symbol decision, a buffer (736) for storing the output of the detector corresponding to the current symbol decision and a processor (300) for seeking within a predetermined window about the initial sampling point for an optimum phase value to provide an adjustment signal which is used by the processor to adjust a subsequent symbol's sychronization clock to provide an optimal sampling point.
    Type: Grant
    Filed: May 13, 1998
    Date of Patent: October 10, 2000
    Assignee: Motorola
    Inventors: Clinton C. Powell, II, Chun-Ye Chang, David L. Brown, David F. Brown, Robert Karl Schweickert
  • Patent number: 6111855
    Abstract: A method (500) of baud detection in a communication device (700) includes the steps of sorting phase pulses among overlapping sets of time slots (502) and counting phase pulses within each of the overlapping sets of time slots creating corresponding counter values (504). Then, counter values are compared with predetermined thresholds (506-512), wherein a baud pass condition (570) is met when at least one counter has a counter value exceeding an upper threshold and wherein a counter N/2 positions away has a counter value below a lower threshold. The baud pass condition may he further conditioned on meeting the requirement that at least another counter value falls below a middle threshold.
    Type: Grant
    Filed: August 3, 1998
    Date of Patent: August 29, 2000
    Assignee: Motorola
    Inventors: Chun-Ye Susan Chang, Clinton C Powell, II
  • Patent number: 6084931
    Abstract: A symbol synchronizer (10) for use in a communication device. The symbol synchronizer (10) comprises a sampling circuit (100) which samples the demodulated signal at a plurality of sampling events for each symbol period to generate three sample values at each sampling event. An eye pattern detector circuit (200) generates eye pattern characteristic information based on the three sample values, and outputs a symbol pulse in response to detecting eye pattern characteristic information consistent with a symbol center. A synchronization noise mask circuit (400) filters symbol pulses that occur during a predetermined period of time after a first symbol pulse is detected for each symbol period. A synchronization adjust circuit (500) generates a synchronization pulse during each symbol period at a particular instant of time during the symbol period based on a history of the occurrences of symbol pulses for a current symbol period and for prior symbol periods.
    Type: Grant
    Filed: October 31, 1997
    Date of Patent: July 4, 2000
    Assignee: Motorola, Inc.
    Inventors: Clinton C. Powell, II, James M. Keba, James R. Webster
  • Patent number: 6055436
    Abstract: A circuit (350) for detecting simulcast channel conditions includes a symbol center averaging circuit (308) for providing a center count of excursions above and below at least a first predetermined threshold and for providing a moving average of the center count over a predetermined number of symbol periods and a symbol edge averaging circuit (310) for providing an edge count of excursions above and below at least a second predetermined threshold and for providing a moving average of the edge count over a predetermined number of symbol periods. Finally, the circuit further includes a comparison circuit (360) programmed to receive and compare the moving average of the center count and the moving average of the edge count to provide a control signal (380) for simulcast detection.
    Type: Grant
    Filed: January 20, 1998
    Date of Patent: April 25, 2000
    Assignee: Motorola
    Inventors: Clinton C. Powell, II, Edgar Herbert Callaway, Jr.
  • Patent number: 5960042
    Abstract: A selective call receiver (800), including a receiver circuit (101) and a processor (810), is used for synchronizing an internal reference to symbol edges of a plurality of symbols in a multi-level radio signal transmitted by a radio communication system. To perform this function the processor (810) is adapted to cause the receiver circuit (101) to demodulate the multilevel radio signal to in-phase and quadrature signals (108, 106), convert the in-phase and quadrature signals (108, 106) to a sequence of state transitions representative of the plurality of symbols, detect at least one same state transition from the sequence of state transitions, and synchronize the internal reference to the at least one symbol edge of the plurality of symbols based on the at least one same state transition.
    Type: Grant
    Filed: July 1, 1997
    Date of Patent: September 28, 1999
    Assignee: Motorola, Inc.
    Inventors: Chun-Ye Susan Chang, Clinton C. Powell, II, James Michael Keba, Stephen R. Carsello
  • Patent number: 5943378
    Abstract: A clock recovery circuit for recovering a symbol clock (226) includes a level decoder (210) for determining one of a plurality of received states of a demodulated signal (105) during each symbol period of the symbol clock (226). Each of the plurality of received states corresponds to one of at least two modulation levels. The level decoder (210) generates for each of the plurality of received states a sign signal (212) having transitions at central threshold transition times and a magnitude signal (211). An edge selector (220) determines selected central threshold transition times. A synchronizable clock (225) is synchronized by the selected central threshold transition times, resulting in a significant reduction of symbol clock (226) jitter.
    Type: Grant
    Filed: August 1, 1996
    Date of Patent: August 24, 1999
    Assignee: Motorola, Inc.
    Inventors: James Michael Keba, Clinton C. Powell, II
  • Patent number: 5799043
    Abstract: A selective call unit (800) comprising a receiver (100) and a processor (810) is used for decoding a 2-level radio signal. The processor (810) is adapted to convert in-phase and quadrature signals generated by the receiver (100) to a sequence of state transitions representative of the plurality of symbols. For each symbol in the plurality of symbols, the processor (810) counts the sequence of state transitions during a symbol period, and compares the recorded count to a predetermined threshold, thereby generating a comparison result. The processor (810) then calculates a bit decision threshold level based on an average of the comparison result for each symbol in the plurality of symbols. For each symbol in a plurality of subsequent symbols, the processor (810) then compares the bit decision threshold level to the sequence of state transitions counted during a symbol period to decode a digital logic level therefrom.
    Type: Grant
    Filed: June 2, 1997
    Date of Patent: August 25, 1998
    Assignee: Motorola, Inc.
    Inventors: Chun-Ye Susan Chang, James Rodney Webster, Clinton C. Powell, II
  • Patent number: 5710975
    Abstract: A battery-powered selective call transceiver, operating in two-way communication with an RF communication system, can be put in a power saving state. A user control on the transceiver allows a user to select the duration of a power saving interval. The transceiver sends to the communication system a signal requesting that the transceiver enter a power saving state for the selected interval. Upon receipt of an acknowledgment signal from the system, the transceiver enters the power saving state.
    Type: Grant
    Filed: December 26, 1995
    Date of Patent: January 20, 1998
    Assignee: Motorola, Inc.
    Inventors: Richard C. Bernhardt, Clinton C. Powell, II
  • Patent number: 5692019
    Abstract: A communication device (400) with a polarization diversity antenna configuration, having a first antenna (410) with a first plane of polarization and a second antenna (412) with a second plane of polarization. Signal strength of a demodulated signal when the antenna switch (420) is coupled to one of the antennas (410, 412) is measured by a signal strength measuring circuit (440) to generate a short-term average signal power (SA) representing signal strength over a first predetermined number of symbol periods, a medium-term average signal power (MA) representing signal strength over a second predetermined number of symbol periods, and a long-term average signal power (LA) representing signal strength over a third predetermined number of symbol periods, greater than the second predetermined number of symbol periods and first predetermined number of symbol periods. Switching between antennas (410, 412) is made in response to differences between SA, MA and LA.
    Type: Grant
    Filed: June 17, 1996
    Date of Patent: November 25, 1997
    Assignee: Motorola, Inc.
    Inventors: Chun-Ye Susan Chang, Jian-Cheng Huang, Lu Chang, Lorenzo Ponce De Leon, David Petreye, James Michael Keba, Clinton C. Powell, II
  • Patent number: 5687197
    Abstract: A data receiver (110) for processing multiple signals includes a receiving circuit (120) for demodulating at least first and second signals and a selector (125) coupled to the receiving circuit (120) for comparing the at least first and second signals to estimated peak and valley values. The selector (125) generates error values associated with the at least first and second signals and selects a data symbol associated with one of the estimated peak and valley values based on the error values. A timing circuit (140, 150) activates the selector (125) at predetermined times, and a controller (140) coupled to the selector (125) and the timing circuit (140, 150) recovers information in accordance with the data symbol and other data symbols.
    Type: Grant
    Filed: July 7, 1995
    Date of Patent: November 11, 1997
    Assignee: Motorola, Inc.
    Inventors: Clinton C. Powell, II, James Michael Keba, Stephen Rocco Carsello, Eric Thomas Eaton
  • Patent number: 5673197
    Abstract: An apparatus and method for updating upper and lower thresholds in peak and valley systems. The apparatus includes comparators which determine which peaks or valleys are eligible for use in the calculation of upper or lower threshold levels. The comparators output the eligible peaks and valleys into statistical blocks that calculate the mean of the peaks and valleys as well as the deviation over a predetermined number of samples. Additional comparators compare either the mean deviation, standard deviation, or variance of the eligible peaks and valleys to predetermined deviation thresholds to determine whether the mean peak or mean valley should be used to calculate update thresholds. The apparatus further includes memory elements that store the mean peak or mean valley values used in the calculation of upper or lower thresholds.
    Type: Grant
    Filed: June 28, 1995
    Date of Patent: September 30, 1997
    Assignee: Motorola, Inc.
    Inventors: James Michael Keba, Clinton C. Powell, II