Patents Assigned to AMI Semiconductor, Inc.
  • Patent number: 7057148
    Abstract: The present invention is a method of optical tracking sensing using block matching to determine relative motion. The method includes three distinct means of compensating for non-uniform illumination: (1) a one-time calibration technique, (2) a real-time adaptive calibration technique, and (3) several alternative filtering methods. The system also includes a means of generating a prediction of the displacement of the sampled frame as compared to the reference frame. Finally, the method includes three cumulative checks to ensure that the correlation of the measured displacement vectors is good: (1) ensuring that “runner-up” matches are near the best match, (2) confirming that the predicted displacement is close to the measured displacement, and (3) block matching with a second reference frame.
    Type: Grant
    Filed: July 29, 2004
    Date of Patent: June 6, 2006
    Assignee: AMI Semiconductor, Inc.
    Inventor: Chinlee Wang
  • Patent number: 7050966
    Abstract: A system and method of improving signal intelligibility over an interference signal is provided. The system includes a psychoacoustic professor having a psychoacoustic model wherein the level of a signal-of-interest is improved so as to be audible above noise and so as not to exceed a predetermined maximum output level. The system can be combined with active noise cancellation.
    Type: Grant
    Filed: August 7, 2002
    Date of Patent: May 23, 2006
    Assignee: AMI Semiconductor, Inc.
    Inventors: Todd Schneider, David Coode, Robert L. Brennan, Peter Olijnyk
  • Patent number: 7034597
    Abstract: A dynamic phase adjustment circuit that includes a multi-tap delay line that receives a clock input signal. The multi-tap delay line includes an initial portion that is adjustable, and final portion after the adjustable portion. A number of registers receive the same data. However, the clock signal that causes the registers to sample is received from a corresponding delay element in the final portion of the multi-tap delay line. An edge detect and data decision circuit receives the sampled data values from each of the registers. Sampling resolution is improved over the PLL-based dynamic phase adjustment circuit since the clock signal is delayed using delay elements, which can be made with relatively small delays. Furthermore, the circuit does not contain excessive circuit elements thereby allowing the dynamic phase adjustment circuit to be contained in a small area.
    Type: Grant
    Filed: September 3, 2004
    Date of Patent: April 25, 2006
    Assignee: AMI Semiconductor, Inc.
    Inventors: Shan Mo, James R. Brown, Richard A. Mosher, Robert S. Kirk
  • Patent number: 7034574
    Abstract: A differential signal output driver circuit having four switching transistors and having a bias transistor that shields each of the switching transistors from the corresponding output terminal thereby blocking the Miller capacitance of the switching capacitor from generating overshoot or undershoot in the output differential voltage. Also, the output driver circuit may be driven by a differential skew cancellation circuit that generates a balanced differential signal to drive the switching transistors to further improve signal integrity. The signal path for generating each signal in the differential signal goes through a similar structure thereby ensuring similar slew in each differential signal provided to the output driver circuit.
    Type: Grant
    Filed: August 17, 2004
    Date of Patent: April 25, 2006
    Assignee: AMI Semiconductor, Inc.
    Inventor: Zhongmin Li
  • Patent number: 7016507
    Abstract: This invention describes a practical application of noise reduction in hearing aids. Although listening in noisy conditions is difficult for persons with normal hearing, hearing impaired individuals are at a considerable further disadvantage. Under light noise conditions, conventional hearing aids amplifying the input signal sufficiently to overcome the hearing loss. For a typical sloping hearing loss where there is a loss in high frequency hearing sensitivity, the amount of boost (or gain) rises with frequency. Most frequently, the loss in sensitivity is only for low-level signals; high level signals are affective minimally or not at all. A compression hearing aid is able to compensate by automatically lowering the gain as the input signal level rises. This compression action is usually compromised under noisy conditions.
    Type: Grant
    Filed: April 16, 1998
    Date of Patent: March 21, 2006
    Assignee: AMI Semiconductor Inc.
    Inventor: Robert Brennan
  • Patent number: 7009444
    Abstract: Silicon-based voltage reference circuits that generate a temperature independent voltage reference that is less than even the silicon bandgap potential. The voltage reference circuit includes a diode-connected metal-silicon Schottky diode that is biased with a current. In this configuration, the anode terminal of the Schottky diode is a CTAT voltage source in this configuration. The anode terminal has a voltage at zero degrees Kelvin at the barrier height of the Schottky diode, which may differ depending on the metal chosen, but in most cases is less than the bandgap potential of silicon. The voltage reference circuit also includes a PTAT voltage source. The PTAT voltage may be generated in a variety of ways. An amplifier amplifies the PTAT voltage, and a summer adds the CTAT voltage to the amplified PTAT voltage to generate the temperature stable voltage reference.
    Type: Grant
    Filed: February 2, 2004
    Date of Patent: March 7, 2006
    Assignee: AMI Semiconductor, Inc.
    Inventor: Greg Scott
  • Patent number: 7006938
    Abstract: Reactive sensors typically exhibit nonlinear response to temperature variation. Systems and methods are disclosed for compensating for the nonlinear and/or temperature dependent behavior of reactive sensors and for calibrating the post-compensation output signals relative to known samples of the physical parameter under measure. One call of embodiments includes a housing containing at least part of a reactive sensor, a monolithic integrated circuit and a timing reference. The integrated circuit includes a waveform generator for generating a sensor exciting signal, a detector for detecting the response of the sensor to the combination of the exciting signal and the under-measure physical parameter, a temperature compensating unit and the Pade Approximant nonlinearity compensating unit are tuned by use of digitally programmed coefficients. The coefficients calibrate the final output as well as compensating for nonlinearity and temperature sensitivity.
    Type: Grant
    Filed: June 16, 2004
    Date of Patent: February 28, 2006
    Assignees: AMI Semiconductor, Inc., Matsushita Electric Works, Ltd.
    Inventors: Jose Marcos Laraia, Masahisa Niwa, Robert P. Moehrke, Jose G. Taveira
  • Patent number: 7006809
    Abstract: A diversity receiver circuit that adaptively selects a variable number of one or more antennas for use in improving signal quality. Each antenna is provided its own receiver that each generates a representation of a received signal. This adaptive selection offers high dynamic adaptability in using the appropriate antennas and receivers at the appropriate time to thereby improving signal-to-noise ratio. The receivers may be direct conversion receivers that implement up-conversion of the baseband signal to reduce DC offset and 1/f noise characteristic of direct conversion architectures.
    Type: Grant
    Filed: May 6, 2003
    Date of Patent: February 28, 2006
    Assignee: AMI Semiconductor, Inc.
    Inventors: Andrei R. Petrov, Craig L. Christensen
  • Patent number: 6960529
    Abstract: Methods for protecting the sidewall of a metal interconnect component using Physical Vapor Deposition (PVD) processes and using a single barrier metal material. After forming the metal interconnect component, a single barrier metal is deposited on its sidewall using PVD. A subsequent anisotropic etching of the barrier metal removes the barrier metal from the horizontal surface except for some that still remains on the top surface of the metal interconnect layer. A dielectric layer is then formed over the metal interconnect component and the barrier metal. The unlanded via is etched through the dielectric layer to the metal interconnect component, and then filled with a second metal to thereby allow the metal interconnect component to electrically connect with one or more upper metal layers.
    Type: Grant
    Filed: February 24, 2003
    Date of Patent: November 1, 2005
    Assignee: AMI Semiconductor, Inc.
    Inventors: Mark M. Nelson, Brett N. Williams, Jagdish Prasad
  • Patent number: 6946828
    Abstract: A current measurement circuit that measures current passing through two loads. The circuit includes a differential output transconductance amplifier. One current output terminal pf the amplifier receives the current from the first load with the first voltage input terminal coupled to that current output terminal. The second current output terminal provides a current to the second load with the second voltage input terminal coupled to the second current output terminal with the current provided at the second output terminal being approximately equal to the current received at the first current output terminal. The transconductance amplifier provides a copy current on the third current output terminal this is approximately equal to at least one of the other output currents. That copy current is then directly measured, rather than the actual current passing through the loads.
    Type: Grant
    Filed: May 20, 2003
    Date of Patent: September 20, 2005
    Assignee: AMI Semiconductor, Inc.
    Inventor: Kent D. Layton
  • Patent number: 6940343
    Abstract: Disclosed is an Amplifier (7) comprising an output driver with a first output stage (4) and a second output stage (5), where an input signal is applied non-inverted to the first output stage and inverted to the second output stage, characterized in that said input signal is applied with delay to one of the output stages (4, 5).
    Type: Grant
    Filed: August 14, 2003
    Date of Patent: September 6, 2005
    Assignee: AMI Semiconductor, Inc.
    Inventors: Alexandre Heubi, Christian Caduff
  • Patent number: 6909305
    Abstract: A digitally controlled impedance driver circuit including a number of fingers, some of which having FETs and series resistors sized in binary or other differential ratios, and some of the higher power FETs being sized in equal ratio and perhaps sharing a series resistor. A DCI controller circuit periodically determines a configuration of the DCI driver circuit that would result in the DCI driver circuit approximating a target impedance. Each time the DCI controller circuit does this, a comparator determines if the impedance of the DCI driver circuit should be increased or decreased. A noise attenuation circuit turns off (or on) only one of the high power fingers if the controller circuit determines that more (or less) impedance is needed even if turning off (or on) only one of the fingers would not result in the configuration of the DCI driver circuit determined by the controller circuit.
    Type: Grant
    Filed: August 8, 2003
    Date of Patent: June 21, 2005
    Assignee: AMI Semiconductor, Inc.
    Inventors: Zhongmin Li, Troy Ruud, Bryce Rasmussen, Shan Mo
  • Patent number: 6882513
    Abstract: An integrated overvoltage and reverse voltage protection circuit. The protection circuit includes a field-effect transistor having a source terminal coupled to an input terminal of the protection circuit, and a drain terminal coupled to an output terminal of the protection circuit. A resistor is coupled between the source terminal and the body terminal of the field-effect transistor to inhibit reverse current flow during a reverse voltage condition. A voltage-current dependent circuit is coupled between the gate terminal and the source terminal of the field-effect transistor, and is configured to apply a voltage between the gate terminal and the source terminal that is dependent on the current passing through the voltage-current dependent circuit. A current application circuit is coupled to the voltage-current dependent circuit and is configured to apply a current that limits or even altogether stops an applied overvoltage condition from reaching a load circuit.
    Type: Grant
    Filed: September 13, 2002
    Date of Patent: April 19, 2005
    Assignee: AMI Semiconductor, Inc.
    Inventor: J. Marcos Laraia
  • Patent number: 6870398
    Abstract: Systems and methods are disclosed for distributing memory within one or more regions of circuitry that perform logic functions (or other types of functions that require dense interconnect structures) on an integrated circuit. The distributed memory reduces high density routing congestion, allows increased logic utilization, and provides areas for additional interconnect structure. Various techniques are also disclosed for accessing the memory.
    Type: Grant
    Filed: April 24, 2003
    Date of Patent: March 22, 2005
    Assignee: AMI Semiconductor, Inc.
    Inventors: James R. Brown, Charles A. Edmondson, Brian R. Kauffmann
  • Patent number: 6867640
    Abstract: An integrated overvoltage and reverse voltage protection circuit that includes two p-channel double-sided extended drain transistors coupled to a high voltage source, each having their n-well coupled through a resistor to the high voltage source. For voltage regulation, a voltage divider is coupled in series with a first of these transistors, while the drain of the second transistor is coupled to the gate of the first transistor. For voltage blocking, the voltage divider may span the entire supply voltage. An n-channel transistor couples the second p-channel transistor to a low voltage source. A middle node in the voltage divider is coupled to one input of a comparator, with a reference voltage coupled to the second input. The comparator output drives the gate terminal of the n-channel transistor. A load to be protected may be disposed in parallel with the voltage divider.
    Type: Grant
    Filed: July 1, 2003
    Date of Patent: March 15, 2005
    Assignee: AMI Semiconductor, Inc.
    Inventors: Greg Scott, J. Marcos Laraia
  • Patent number: 6844781
    Abstract: A dual differential-input operational amplifier that includes six PMOSFETs having their source terminals coupled to a high voltage. A seventh and eighth PMOSFET have their source terminals coupled to a current source. Four NMOSFETs have their source terminals coupled to a low voltage. A fifth and sixth NMOSFET have their source terminals coupled to a current sink. The various PMOSFETs and NMOSFETs are coupled together such that the gate terminals of the fifth NMOSFET and eighth PMOSFET receive a first input of the differential input, and such that the gate terminals of the sixth NMOSFET and the seventh PMOSFET receive a second input of the differential input. The operational amplifier may be vertically inverted, or implemented by bipolar transistors, with cascoding devices, and with a second stage in the form of an inverter.
    Type: Grant
    Filed: July 7, 2003
    Date of Patent: January 18, 2005
    Assignee: AMI Semiconductor, Inc.
    Inventors: Joseph Walsh, Stan Latimer
  • Patent number: 6822513
    Abstract: A complementary differential amplifier includes two differential amplifiers. Each differential amplifier includes two input FETs (or bipolar transistors) having gate terminals coupled to the input terminals of the complementary differential amplifier. Two current load p-type field-effect transistors are each coupled in series between one voltage source and a drain terminal of a respective input FET. A current source FET is coupled in series between a common source terminal of the two input n-type field-effect transistors and a low voltage source. Only two FETs are needed to bias all of the current load and source FETs. A complementary folded cascode stage as well as an inverter stage may also be included.
    Type: Grant
    Filed: May 28, 2003
    Date of Patent: November 23, 2004
    Assignee: AMI Semiconductor, Inc.
    Inventors: Zhongmin Li, Bryce Rasmussen
  • Patent number: 6819195
    Abstract: An oscillation circuit including a resonating element such as a crystal, an inverting amplifier and a resistor that each span the resonating element terminals, and two capacitors that capacitively couple the resonating element terminals to ground. An AC current source such as a temperature compensated and properly trimmed ring oscillator generates a differential AC current when active. The differential AC current has a frequency that is within a tolerance of the resonant frequency of the resonant element for a given set of operating conditions. Two buffers connect the differential outputs of the AC current source to respective terminals of the resonating element to thereby shorten startup time. A control logic circuit carefully times the application of the differential AC current to the resonating element terminals such that the current is applied for a sufficient time such that startup would occur under any anticipated operating condition.
    Type: Grant
    Filed: March 7, 2003
    Date of Patent: November 16, 2004
    Assignee: AMI Semiconductor, Inc.
    Inventors: Shane A. Blanchard, Jeremy J. Rice
  • Patent number: 6819163
    Abstract: A switched capacitor voltage reference circuit that has a transconductance circuit that receives the output of the amplifier, and then outputs a current that depends on its input voltage. This may be accomplished using a charge pump that is controlled by the amplifier output. The transconductance circuit provides a reference voltage at the output terminal of the switched capacitor generation circuit. A capacitor capacitively couples the output terminal of the switched capacitor circuit to the inverting terminal of the amplifier during the generation phase. By adjusting the capacitances of the various capacitors, the level and temperature dependence of the generated reference voltage may be controlled. Also, the charge pump often allows for reference voltages that are greater than the supply voltage.
    Type: Grant
    Filed: March 27, 2003
    Date of Patent: November 16, 2004
    Assignee: AMI Semiconductor, Inc.
    Inventor: Bernard Robert Gregoire, Jr.
  • Patent number: 6816401
    Abstract: An SRAM memory includes a pull-up device coupled to each row of word lines in an array of SRAM cells. The pull-up devices are sized such that when a row is selected, the time for the associated word line to fully charge is sufficiently slow such that data stored in the selected SRAM cells are not corrupted during a read operation. By slowly charging the word lines, the corresponding access transistors are also slowly turned on, resulting in the coupled bit lines slowly charging or discharging from the data stored in the SRAM cell. Because there is not a sudden large charge transfer between the stored data and the coupled bit line, the data will not be corrupted during a read operation, and read precharge circuitry is not required.
    Type: Grant
    Filed: April 3, 2003
    Date of Patent: November 9, 2004
    Assignee: AMI Semiconductor, Inc.
    Inventors: Brian R. Kauffmann, Charles A. Edmondson, James R. Brown