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President Rutherford B. Hayes ; Said in 1876, after Alexander Graham Bell demonstrated the telephone to him at the White House
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| Number | Title | Issue Date |
| 8400230 | Frequency modulation of clocks for EMI reduction In an electronic system, a frequency modulator manages clock signals for electromagnetic interference (EMI) reduction. The illustrative frequency modulator comprises a core oscillator, and a clock divider coupled to the core oscillator that modulates frequency of th... | 03/19/2013 |
| 8072284 | Split delay-line oscillator for secure data transmission A split delay-line oscillator for secure data transmission is disclosed. In one embodiment, an apparatus for a split delay-line oscillator for secure data transmission includes a first modulator/demodulator block in a first device, the first modulator/demodulator bl... | 12/06/2011 |
| 8044745 | Method and apparatus for applying clock phase and frequency offset Various apparatuses and methods for offsetting the phase and/or frequency of a clock signal are disclosed herein. For example, some embodiments provide an apparatus for generating a clock signal, including a quadrature delay circuit connected to an input clock signa... | 10/25/2011 |
| 7961061 | Apparatus and method for modulation and demodulation using frequency selective baseband Provided are modulation and demodulation methods and apparatuses using a frequency selective baseband. The frequency modulation method includes: generating a plurality of subgroups by dividing 2N (N is a real number) spread codes used for frequency spreading into 2M... | 06/14/2011 |
| 7876169 | Modulating circuit There are included a first quadrature modulation part (5) that divides an input signal into an I signal and a Q signal having a phase orthogonal to the phase thereof and uses a baseband frequency to perform frequency conversions of the I and Q signals, thereb... | 01/25/2011 |
| 7868712 | Circuit arrangement for frequency modulation A circuit arrangement for frequency modulation is provided, which includes a voltage-controlled oscillator having at least one varactor diode that is driven by a drive signal, wherein a capacitance of the varactor diode depends on the drive signal, includes a modula... | 01/11/2011 |
| 7646258 | Digital FM transmitter with variable frequency complex digital IF A system, method and apparatus are described for digitally synthesizing a signal for FM transmission. A complex variable frequency digital IF signal is generated for use by a digital modulator in transmission of a signal with an integrated circuit. In some examples,... | 01/12/2010 |
| 7408416 | Phase locked loop, signal generating apparatus and synchronization method A phase locked loop for outputting a high frequency signal by executing synchronization and frequency conversion based on an input signal includes a control-type oscillator, and a phase comparator circuit for comparing a phase of the input signal and a phase of an o... | 08/05/2008 |
| 7403079 | Frequency modulator and frequency modulation method A frequency modulation method is provided in which the frequency of a carrier signal is modulated on the basis of the frequency of a modulation signal, and in which the modulation signal is integrated. The carrier signal is integrated, and a differential signal is f... | 07/22/2008 |
| 7349488 | Frequency shift keying signaling for integrated circuits The present invention relates to a system for communicating between two integrated circuits (ICs) or within an IC. The ICs are either on the same circuit boards or on different circuit boards with a common backplane. A first integrated circuit has transmitter circui... | 03/25/2008 |
| 7339809 | Systems and methods for electrical power regulation and distribution in aircraft The present invention comprises systems and methods for electrical power regulation and distribution. In an embodiment, a system includes a modulator coupled to the source that receives an unregulated output waveform and is operable to produce a first composite wave... | 03/04/2008 |
| 7333051 | Methods and devices for determining the linearity of signals A method (for example, machine-implemented, e.g., via a receiver), for determining whether a transmitted pulsed-signal is a linear or non-linear frequency modulated (FM) signal, includes: iteratively determining upper and lower bound slopes associated with frequency... | 02/19/2008 |
| 7327816 | High resolution synthesizer with improved signal purity An automatic test system using a DDS signal generator to create a signal with high spectral purity or a low jitter digital clock. The low jitter clock has variable frequency and is programmed to control other test functions, such as the generation of arbitrary wavef... | 02/05/2008 |
| 7321735 | Optical down-converter using universal frequency translation technology A method and system for converting an optical signal to electrical information signals, including demodulated baseband information signals and modulated baseband signals at multiple harmonics. In an embodiment, the optical information signal is amplitude modulated w... | 01/22/2008 |
| 7321751 | Method and apparatus for improving dynamic range in a communication system An apparatus for improving dynamic range includes a frequency down-conversion module that receives an input signal and a bias circuit. The bias circuit includes a first resistor and a second resistor. The first resister has a first terminal coupled to a bias point a... | 01/22/2008 |
| 7302011 | Quadrature frequency doubling system The frequency doubler of the present invention operates to provide an in-phase signal and a quadrature signal, each having a frequency equal to twice the frequency of a reference signal. The in-phase and quadrature signals are based on signals that are 0 degrees, 45... | 11/27/2007 |
| 7298220 | Method and apparatus for creating a multiple loop VCO Disclosed herein is a method and apparatus used to create an idealized voltage controlled oscillator (VCO) which allows very high modulation rates without the expected phase noise (jitter) which nominally comes from wide bandwidth VCOs. In this fashion, high quality... | 11/20/2007 |
| 7295826 | Integrated frequency translation and selectivity with gain control functionality, and applications thereof Methods and apparatuses for frequency selectivity and frequency translation, and applications for such methods and apparatuses, are described herein. The method includes steps of filtering an input signal, and down-converting the filtered input signal. The filtering... | 11/13/2007 |
| 7292835 | Wireless and wired cable modem applications of universal frequency translation technology Frequency translation and applications of same are described herein, including cable modem applications. Such applications include, but are not limited to, frequency down-conversion, frequency up-conversion, enhanced signal reception, unified down-conversion and fil... | 11/06/2007 |
| 7271678 | Apparatus and method for generating frequencies A frequency generation apparatus and a method are provided. The frequency generation apparatus for generating a plurality of center frequencies for use in multi-band hopping communication, includes: an oscillator generating an oscillation frequency; a reference freq... | 09/18/2007 |
| 7268640 | Frequency generator arrangement A frequency generator is provided. The generator comprises two voltage controlled oscillators generating a first signal of a given multiple of a predetermined raster frequency, and a second signal of another given multiple of a predetermined raster frequency, divide... | 09/11/2007 |
| 7263136 | Predistortion modulator A device for predistorting a digital symbol for modulating an RF signal includes a multi-bit buffer connected to an input serial bit stream and providing a parallel bit stream from the input serial bit stream; and a processing module connected to the input parallel ... | 08/28/2007 |
| 7233215 | Frequency modulation circuit The frequency modulation circuit includes: a phase shift section for receiving a multiphase clock signal composed of a plurality of clock signals having a predetermined phase difference therebetween and shifting the phase of the multiphase clock signal; a clock sele... | 06/19/2007 |
| 7231707 | Method of manufacturing planar inductors Method of forming a ferromagnetic layer on at least one surface of a dielectric material that may be serve as an inductive core on a printed circuit board or a multichip module. Conductive leads can form two separate coils around the core to form a transformer, and ... | 06/19/2007 |
| 7224302 | Integrated PM/FM modulator using direct digital frequency synthesis and method therefor A PM/FM modulator (100) includes an analog-to-digital converter (110) having an input terminal for receiving an analog input signal, and an output terminal, and a direct digital frequency synthesizer (120) having an input terminal coupled to the... | 05/29/2007 |
| 7167074 | Integrated planar flyback transformer Method and apparatus are provided for fabricating a planar transformer assembly for use in an implantable medical device. The planar transformer assembly includes a board, a first core, and a second core. The board has a first side, a second side, and an embedded wi... | 01/23/2007 |
| 7161510 | Switching amplifier comprising a delta-sigma modulation circuit A switching amplifier is provided with a delta-sigma modulation circuit that performs delta-sigma modulation of an input signal that is either an analog signal or a multi-bit signal and outputs a quantized signal, a pulse amplifier that has a switching element and p... | 01/09/2007 |
| 7130327 | Digital frequency synthesis Frequency synthesis is implemented by providing a delta-sigma modulated signal associated with a selected frequency, which frequency can vary based on a selection input. The delta-sigma modulated signal is converted from the digital to analog domain. The delta-sigma... | 10/31/2006 |
| 7110435 | Spread spectrum applications of universal frequency translation Frequency translation and spread spectrum applications of same are described herein. Such applications include, but are not limited to, unified down-conversion and de-spreading, unified up-conversion and spreading, RAKE receivers utilizing unified down-conversion an... | 09/19/2006 |
| 7110444 | Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments and circuit implementations Frequency translation and applications of the same are described herein, including RF modem and wireless local area network (WLAN) applications. In embodiments, the WLAN invention includes an antenna, an LNA/PA module, a receiver, a transmitter, a control signal gen... | 09/19/2006 |
| 7102326 | Motor speed variator and a driving method thereof A motor variator and a driving method thereof are provided for controlling the operating speed of a fan, which employ an alternate current chopper to change the working cycle and the rotary speed of a stepless motor. The motor variator includes a high-frequency alte... | 09/05/2006 |
| 7082536 | System and method for computerized global messaging encryption A computer based message encryption system for transmitting encrypted message between a sending member of an internal messaging system and a receiving non-member or receiving member external user without requiring the sender or recipient member to maintain and suppo... | 07/25/2006 |
| 7082171 | Phase shifting applications of universal frequency translation A universal frequency translation module (UFT) frequency translates an electromagnetic (EM) input signal by sampling the EM input signal according to a periodic control signal (also called an aliasing signal). By controlling the relative sampling time, the UFT modul... | 07/25/2006 |
| 7072390 | Wireless local area network (WLAN) using universal frequency translation technology including multi-phase embodiments Frequency translation and applications of the same are described herein, including RF modem and wireless local area network (WLAN) applications. In embodiments, the WLAN invention includes an antenna, an LNA/PA module, a receiver, a transmitter, a control signal gen... | 07/04/2006 |
| 7057467 | Light-controlled oscillator A light-controlled oscillator includes a circuit device, a detection circuit and a control circuit. The circuit device changes its characteristics when light is applied, so that a frequency of the oscillation shifts. The detection circuit detects a change of the cha... | 06/06/2006 |
| 7054296 | Wireless local area network (WLAN) technology and applications including techniques of universal frequency translation Frequency translation and applications of same are described herein, including wireless local area network (WLAN) applications such as IEEE Standard 802.11 WLANs. Such applications include, but are not limited to, frequency down-conversion, frequency up-conversion, ... | 05/30/2006 |
| 7043202 | Frequency modulator apparatus of phase selection type, and frequency synthesizer of phase selection type A phase-selective type frequency modulator capable of easing the restriction on a phase range of a modulated clock signal. The phase-selective type frequency modulator includes a multiphase clock signal generating circuit 101 for generating N-phase clock sign... | 05/09/2006 |
| 7039377 | Switchable gain amplifier A switchable gain amplifier for use in mobile communications devices is provided, having a first amplifier stage having a first gain, a second amplifier stage connected in parallel with the first amplifier stage. The first and second amplifier stage have different g... | 05/02/2006 |
| 7039372 | Method and system for frequency up-conversion with modulation embodiments A method and system is described wherein an information signals is gated at a frequency that is a sub-harmonic of the frequency of the desired output signal. In the modulation embodiments, the information signal is modulated as part of the up-conversion process. In ... | 05/02/2006 |
| 7027786 | Carrier and clock recovery using universal frequency translation Coherent detection of a received EM signal using universal frequency translation (UFT) is described herein. The received EM signal is sampled according to a sub-harmonic LO signal, where the LO signal is in frequency and phase coherence with the received EM signal. ... | 04/11/2006 |
