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| Number | Title | Issue Date |
| 7982547 | Phase locked loop-based tuning adjustable filter Phase locked loop based frequency tuning of an adjustable filter is disclosed. A resonant circuit includes the adjustable filter, and an oscillator signal provides an input to the resonant circuit. ... | 07/19/2011 |
| 7791419 | Timing calibration for crystal oscillators within a mesh network Timing calibrator is disclosed. A first oscillator includes an output. The first oscillator includes a mechanically resonant element. A second oscillator includes an output. The second oscillator includes a quartz resonator. A frequency relater has an output, a firs... | 09/07/2010 |
| 7782145 | Method and system for frequency tuning based on characterization of an oscillator Aspects of a method and system for frequency tuning based on characterization of an oscillator are provided. In this regard, a frequency of an oscillator in an integrated circuit may be controlled based on a first digital control word, a frequency of a tuned circuit... | 08/24/2010 |
| 7427901 | Oscillator array, and synchronization method of the same Signals outputted from oscillators (1-1, 1-2, . . . 1-n) are in phase with signals as reflected by band elimination filters (3-1, 3-2, . . . 3-n) at elimination frequencies of the band elimination filters (3... | 09/23/2008 |
| 7397311 | Oscillator coupling to reduce spurious signals in receiver circuits A first receiver frequency reference is passively coupled to a second receiver by tapping a signal directly from the resonant element, such as a crystal, of an oscillator in the first receiver to drive the input of the second receiver. The sinusoidal signal from the... | 07/08/2008 |
| 7391273 | Clock signal output apparatus and control method of same, and electric apparatus and control method of same The clock signal output device has a crystal oscillator for generating a reference clock signal and generating and outputting an output clock signal having a prescribed frequency on the basis of the reference clock signal. The device also has an atomic oscillator fo... | 06/24/2008 |
| 7362150 | Method and system for synchronizing phase of triangular signal A multiplicity of electronic devices is provided to generate triangular wave signals variable between an upper and lower limit voltages by charging or discharging capacitors. One of the triangular wave signals serves as a master triangular wave signal for controllin... | 04/22/2008 |
| 7355482 | Methods and apparatus for compensating a variable oscillator for process, voltage, and temperature variations using a replica oscillator Circuits and methods for compensating a variable oscillator for process and/or operational variations. The circuit generally comprises (a) a replica oscillator, (b) a counter configured to count pulses of the replica oscillator and to produce a count signal, and (c)... | 04/08/2008 |
| 7356423 | Apparatus and method for reading out a differential capacity with a first and second partial capacity An apparatus for reading out a differential capacity with a first and second partial capacity includes a first oscillator having a first frequency-determining element connectable to the first partial capacity and a second oscillator having a second frequency-determi... | 04/08/2008 |
| 7327203 | PWM signal generation circuit and PWM control circuit A PWM signal generation circuit and a PWM control circuit are provided in which the duty ratio is easily changed and which can also avoid adverse impact from ambient temperature changes and the like. At the beginning of charging a capacitor with a current flow, a vo... | 02/05/2008 |
| 7313369 | Communication semiconductor integrated circuit and radio communication system A communication semiconductor integrated circuit has an oscillator circuit forming part of a transmission PLL circuit fabricated on a single semiconductor chip together with an oscillator circuit forming part of a reception PLL circuit and an oscillator circuit for ... | 12/25/2007 |
| 7271622 | Quadrature voltage controlled oscillators with phase shift detector In wireless application there is made use of a quadrature oscillators that generate signals that are capable of oscillating at quadrature of each other. The quadrature oscillator is comprised of two differential modified Colpitts oscillators. A capacitor bank allows... | 09/18/2007 |
| 7259635 | Arbitrary frequency signal generator The present invention is based on the objective of constructing a PLL as arbitrary frequency generator for frequency multiplication purposes without utilizing a VCO. The invention shows a solution which can be realized with a pure digital circuit which can be easily... | 08/21/2007 |
| 7259705 | Tracking supply AC regeneration system and method A circuit for implementing tracking supply alternating current (“AC”) regeneration is described. In one embodiment, the circuit comprises a line synchronization device for converting an incoming AC signal to a square wave, wherein the square wave is precisely in... | 08/21/2007 |
| 7250825 | Method and apparatus for calibration of a low frequency oscillator in a processor based system Method and apparatus for calibration of a low frequency oscillator in a processor based system. A method for calibrating an on-chip non-precision oscillator. An on-chip precision oscillator is provided having a known frequency of operation that is within an acceptab... | 07/31/2007 |
| 7224196 | Method and system for synchronizing phase of triangular signal A multiplicity of electronic devices is provided to generate triangular wave signals variable between an upper and lower limit voltages by charging or discharging capacitors. One of the triangular wave signals serves as a master triangular wave signal for controllin... | 05/29/2007 |
| 7210656 | Control, sound, and operating system for model trains A model train operating, sound and control system that provides a user with increased operating realism. A novel remote control communication capability between the user and the model trains. This feature is accomplished by using a handheld remote control on which v... | 05/01/2007 |
| 7183869 | Circuit and method for temperature compensation In the present invention, a temperature compensation circuit is provided. The temperature compensation circuit includes a first oscillator for providing a first clock signal, a timer electrically connected to the first oscillator for clocking a specific time period,... | 02/27/2007 |
| 7173495 | Redundant back-up PLL oscillator phase-locked to primary oscillator with fail-over to back-up oscillator without a third oscillator A redundant-source clock generator has only two oscillators, rather than three oscillators. A secondary oscillator is phase-locked to a primary clock from a primary oscillator using a phase detector, charge pump, and filter that generate a control voltage to the sec... | 02/06/2007 |
| 7151415 | Injection locked dual opto-electronic oscillator An injection locked dual opto-electronic oscillator having a master oscillator which generates a high Q RF output signal with a plurality of harmonic signals within a predetermined pass band. A slave oscillator has a modulation input coupled to the output signal fro... | 12/19/2006 |
| 7139530 | Method and apparatus for calibrating a reference oscillator A method and apparatus for calibrating a reference oscillator and use of a calibrated reference oscillator is disclosed. To gain cost reduction advantages, a less accurate reference oscillator is utilized in a wireless communication device. The cost benefit is gaine... | 11/21/2006 |
| 7136323 | Apparatus and method for generating a variable-frequency clock Apparatus and method for generating a variable-frequency clock is disclosed. A control state machine defines various commands and generates corresponding control signals. A variable-frequency clock generator then outputs the variable-frequency clock that has a speci... | 11/14/2006 |
| 7113051 | Frequency characterization of quartz crystals Techniques for determining a frequency profile of a quartz crystal in real time. Quartz crystals are subjected to a series of temperature cycles at various temperature rates and the crystal frequencies, crystal temperature parameters, and the temperature rates are m... | 09/26/2006 |
| 7106385 | Apparatus and method for reducing the visual effects of artifacts present in a line scanned video display On a line scanned video display, the frequency of an artifact producing signal within the video passband is selected to be an odd harmonic of one half the horizontal line scan frequency so that adjacent scan lines of the artifact are 180 degrees out of phase with ea... | 09/12/2006 |
| 7058149 | System for providing a calibrated clock and methods thereof A system and methods are provided for calibrating timing in a remote device to timing in a source device. The source device dictates timing signals to be generated in the remote device. A calibration routine is processed to calibrate timing in the remote device to t... | 06/06/2006 |
| 7053319 | Electronic weighing apparatus utilizing surface acoustic waves using sensors operating at different frequencies, having temperature compensation, and a push oscillator A weighing apparatus includes a SAW oscillator and a “push oscillator” to force the SAW oscillator into a desired mode of operation. A SAW temperature oscillator and a thermistor are also provided. The frequency of the “push oscillator” is made immune to tem... | 05/30/2006 |
| 7009458 | Method and system for fast wake-up of oscillators A method and system for fast wakeup of a high-Q oscillator (300) that includes a resonating element (304), preferably a crystal resonator (304), and an amplifier (310). The method comprises connecting the resonating element (304) t... | 03/07/2006 |
| 6975106 | Phase locked time interval analyzer A method of analysis of a time interval between two selected measurement edges of interest includes locking a plurality of at least three substantially interchangeable oscillators to a common reference frequency, the oscillators containing digital locked-loop (DLL) ... | 12/13/2005 |
| 6963249 | Injection locking using direct digital tuning The invention relates to the field of electronics and more particularly to the tuning and injection locking of voltage controlled oscillators (VCOs). An improved injection locking circuit is provided which allows the VCO to injection lock with a smaller reference si... | 11/08/2005 |
| 6937107 | Device and method of quadrature oscillation Briefly, devices and methods for tuning of quadrature oscillators which may be used, for example, in a Complementary Metal-Oxide Semiconductor (CMOS) process. Devices and methods in accordance with some exemplary embodiments of the invention may allow, for example, ... | 08/30/2005 |
| 6919776 | Traveling wave device for combining or splitting symmetric and asymmetric waves A traveling wave device for the combining or splitting of symmetric and asymmetric traveling wave energy includes a feed waveguide for traveling wave energy, the feed waveguide having an input port and a launching port, a reflector for coupling wave energy between t... | 07/19/2005 |
| 6870428 | Mobile radio communications device having a PLL that phase locks with two crystal oscillators A mobile radio communications device has a first crystal oscillator for providing a first master clock frequency for the timebase of a first communications system, a second crystal oscillator for providing a second master clock frequency for the timebase of a second... | 03/22/2005 |
| 6870429 | Variable rate modulator Clock signals and digital data signals at a variable frequency are introduced to the input of a FIFO and are passed from the FIFO at a second (or intermediate) frequency controlled by a numerically controlled oscillator. To regulate the frequency of the signals from... | 03/22/2005 |
| 6850122 | Quadrature oscillator and methods thereof A quadrature oscillator includes a master tuned oscillator and two injection-locked slave tuned oscillators. ... | 02/01/2005 |
| 6819189 | Voltage-controlled oscillator having short synchronous pull-in time A voltage-controlled oscillator includes a control terminal having a control voltage applied thereto, first and second output terminals, first and second ring oscillators, first and second output buffer circuits, and a latch circuit. The first and second ring oscill... | 11/16/2004 |
| 6734738 | Low power timer circuit having stable output frequency A timer circuit having an oscillator circuit that has low power consumption and a stable frequency of the output signal. Timer circuit 10 has highly stable oscillator 21, counter 22 and frequency dividing value controller 24. Highly stabl... | 05/11/2004 |
| 6538516 | System and method for synchronizing multiple phase-lock loops or other synchronizable oscillators without using a master clock signal A system and method for synchronizing a plurality of synchronizable oscillators are disclosed. The method includes monitoring a respective output signal of each synchronizable oscillator, each output signal having a respective frequency, generating a sync... | 03/25/2003 |
| 6522210 | Random pulse generator Random pulse generators and generating systems using at least three oscillators. The output signals of at least two of the oscillators are combined to disturb the output signal of a final oscillator. For one configuration, combined output signals of at le... | 02/18/2003 |
| 6522209 | Oscillator averaging phase shift generator Two oscillators, such as in two pulse width modulator circuits of DC to DC power converters, are maintained in synchronization and at a predetermined phase shift from one another by a circuit incorporating a comparator. A sawtooth signal output from the m... | 02/18/2003 |
| 6509803 | Voltage-controlled oscillator having short synchronous pull-in time A voltage-controlled oscillator comprises a control terminal applied to a control voltage, first and second output terminals, first and second ring oscillators, first and second output buffer circuits and a latch circuit. Each of the first and second ring... | 01/21/2003 |
