Feedback Control, Mechanical Patents (Class 324/76.81)
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Patent number: 8760176Abstract: Systems provide for a test system for capacitors in a digitally controllable oscillator (DCO). The system includes: capacitor toggling logic configured to switch on and off a selected one of the capacitors at a modulation frequency; a tone generator configured to generate a tone; a mixer configured to receive the tone and an output carrier signal from the DCO while the capacitor toggling logic is switching the selected one of the capacitors on and off and to output an intermediate frequency signal having FM sidebands based on the modulation frequency and relative capacitor size; and an evaluation circuit configured to evaluate a frequency deviation associated with the selected one of the capacitors based on at least one of the FM sidebands.Type: GrantFiled: May 19, 2011Date of Patent: June 24, 2014Assignee: St-Ericsson SAInventor: Jeroen Kuenen
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Patent number: 8519696Abstract: An integrated circuit comprises at least first and second frequency generating circuits, wherein each frequency generating circuit comprises a reference frequency source; a voltage controlled oscillator; and a feedback control circuit for controlling the voltage controlled oscillator to provide a desired output frequency signal. The output of the voltage controlled oscillator of the first frequency generating circuit is switched into the feedback control circuit of the second frequency generating circuit to provide a test signal for testing one or more components of the feedback control circuit of the second frequency generating circuit.Type: GrantFiled: May 19, 2011Date of Patent: August 27, 2013Assignee: NXP B.V.Inventor: Francois Lefevre
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Patent number: 7847792Abstract: A simple, integrated control for pan and zoom of a display of data represented by a very long data record is in the form of a control knob having an outer ring for controlling pan and an inner knob for controlling a zoom factor. A zoom function is turned ON either by turning the inner knob (setting the zoom factor to a default value) or by (i) pressing an adjacent zoom or pan button or (ii) turning the outer ring (setting the zoom factor to a prior value when the zoom function was turned OFF). The zoom function may be turned OFF by turning the inner knob to set the zoom factor to 1× or by pressing the zoom button. The outer ring has individual positions divided into two groups: one group for controlling pan rate within a zoom window displaying a portion of the very long data record defined by a zoom box within a main window displaying the very long data record; and the other group for controlling pan rate of the zoom box within the main window for rapid movement from one end of the record to another.Type: GrantFiled: June 28, 2006Date of Patent: December 7, 2010Assignee: Tektronix, Inc.Inventors: Scott R. Ketterer, Lance H. Forsberg, Lynne A. Fitzsimmons, Evan A. Dickinson, Steven C. Herring, Kenneth P. Dobyns, Keith D. Rule
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Patent number: 7769497Abstract: A method of performing loadflow calculations for controlling voltages and power flow in a power network by reading on-line data of given/specified/scheduled/set network variables/parameters and using control means, so that no component of the power network is overloaded as well as there is no over/under voltage at any nodes in the network following a small or large disturbances.Type: GrantFiled: August 29, 2003Date of Patent: August 3, 2010Inventor: Sureshchandra B. Patel
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Patent number: 7757115Abstract: A feedback control device capable of continuously performing high-accuracy, stable control even in cases where any of multiple controllers for controlling a controlled system becomes incapable of control action. A controller (master controller) generates control data for stably controlling a heater by feedback control, controls the heater in accordance with the control data, and sends the control data to the other controller (slave controller). The slave controller receives the control data from the master controller but does not control the heater while the master controller is operating normally. If the master controller develops anomaly and becomes incapable of normal control action, the slave controller initiates feedback control of the heater in accordance with the control data received from the master controller immediately before the anomaly occurred, and controls the heater thereafter in accordance with control data generated thereby.Type: GrantFiled: August 7, 2007Date of Patent: July 13, 2010Assignee: Fujitsu LimitedInventors: Yoshiaki Shibayama, Yuichi Nagaki, Tsutomu Yamada, Hiroshi Oikawa
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Patent number: 7728576Abstract: The traveling wave excitation system phase shifter chassis method and device of the invention is compact, inexpensive, and versatile when compared to customary methods for generating traveling wave excitation signals that would require using an equivalent number of commercial function generators. The method and device of the invention produces up to 56 simultaneous sine waves that are phase shifted with respect to one another.Type: GrantFiled: January 7, 2004Date of Patent: June 1, 2010Assignee: The United States of America as represented by the Secretary of the Air ForceInventors: Keith W. Jones, Christophe Pierre, Steven L. Ceccio, John Judge, Steve Fuchs