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| Number | Title | Issue Date |
| 8031010 | Ruggedized chip scale atomic clock The present invention is a Chip Scale Atomic Clock (CSAC)-enabled Time and Frequency Standard (CTFS) architecture. The CTFS architecture includes a microcontroller, a Time Compensated Crystal Oscillator (TCCO) circuit which is connected to the microcontroller, and a... | 10/04/2011 |
| 7898345 | Method of frequency synthesis for fast switching A digital frequency synthesizer can be implemented with single source design, a multiplexer design, a fractional divider design, or a frequency multiplier and frequency divider design. Implementations can utilize a controller dithering circuit or a delta-sigma modul... | 03/01/2011 |
| 7868705 | High-frequency oscillator and electronic apparatus In a high-frequency oscillator, a first resonance circuit and a second resonance circuit are respectively connected to a first amplifier circuit and a second amplifier circuit. A selection circuit includes a first switch circuit and a second switch circuit which sel... | 01/11/2011 |
| 7812679 | Multi-band frequency generation method and apparatus A frequency generation unit (FGU) 100 includes a plurality of selectable voltage controlled oscillators (110) whose output frequencies are chosen in relationship with a predetermined intermediate frequency (IF) and frequency divider value (M) to provid... | 10/12/2010 |
| 7629855 | Frequency-selective oscillator The object of the present invention is to provide a frequency-selective oscillator capable of outputting two frequencies without hindering the downsizing of the device and capable of obtaining good output voltage characteristics. The frequency-selective oscillator i... | 12/08/2009 |
| 7619484 | Oscillator phase matching A system comprises a primary oscillator that provides a first signal having a first phase and a backup oscillator that provides a second signal having a second phase. The system also comprises trim logic coupled to the backup oscillator logic. Prior to failure of th... | 11/17/2009 |
| 7598817 | Oscillator for outputting different oscillation frequencies An oscillator includes: oscillation units (11 through 1n) outputting oscillation signals of different frequencies; a transmission line (15) to which outputs of the oscillation units (11, 12) are connected, the transmission line having a c... | 10/06/2009 |
| 7589598 | Dual-band voltage controlled oscillator The present invention discloses a dual-band voltage controlled oscillator (VCO), comprising a plurality of resonant circuits; an inductor module; a plurality of switches of current source; a buffer circuit; and a output port. The dual-band voltage controlled oscilla... | 09/15/2009 |
| 7583153 | Systems and methods for multiplexing multiphase clocks Various embodiments of the present invention provide systems, circuits and methods that allow for switching between two or more multiphase clocks. As one example, a system for switching between multiphase clocks is disclosed. The system includes a multiphase clock m... | 09/01/2009 |
| 7576617 | Semiconductor integrated circuit device A semiconductor integrated circuit device is disclosed that includes a signal processing unit having a nonvolatile memory and a detection unit; plural oscillation sources outputting plural oscillation signals; a selection control unit that selects one of the oscilla... | 08/18/2009 |
| 7576618 | Frequency synthesizer with a plurality of frequency locking circuits The present invention discloses a frequency synthesizer, including: a plurality of frequency locking circuits, for locking a plurality of clock signals to output the clock signals according to a plurality of reference clock signals respectively; a selecting circuit,... | 08/18/2009 |
| 7551039 | Phase adjustment in phase-locked loops using multiple oscillator signals Phase-locked loop (PLL) logic comprises an oscillator that produces a first oscillator signal and phase detect logic that determines a phase difference between the first oscillator signal and a second oscillator signal. After the second oscillator signal is replaced... | 06/23/2009 |
| 7538624 | Oscillator having multiple oscillation units The present invention is an oscillator including: first transistors outputting oscillation signals of different oscillation frequencies to collectors; a common node to which outputs of emitters of the first transistors are connected and input; a feedback circuit fee... | 05/26/2009 |
| 7482885 | Method of frequency synthesis for fast switching A digital frequency synthesizer can be implemented with single source design, a multiplexer design, a fractional divider design, or a frequency multiplier and frequency divider design. Implementations can utilize a controller dithering circuit or a delta-sigma modul... | 01/27/2009 |
| 7443258 | Oscillator system having a plurality of microelectromechanical resonators and method of designing, controlling or operating same There are many inventions described and illustrated herein. In one aspect, the present inventions relate to oscillator systems which employ a plurality of microelectromechanical resonating structures, and methods to control and/or operate same. The oscillator system... | 10/28/2008 |
| 7414490 | Dual-band voltage-controlled oscillator using bias switching and output-buffer multiplexing Disclosed is a dual-band voltage-controlled oscillator using bias switching and output-buffer multiplexing. The dual-band voltage-controlled oscillator includes a power supply unit for supplying a source voltage; plural voltage-controlled oscillation units for outpu... | 08/19/2008 |
| 7408420 | Multi mode clock generator In some embodiments, a clock generator is provided that provides a generator clock. The clock generator comprises a first clock source to provide a first clock and a second clock source to provide a second clock whose frequency at least indirectly tracks a supply to... | 08/05/2008 |
| 7406297 | Clock generation circuit and semiconductor device provided therewith It is an object of the present invention to solve a problem that malfunction of communication is generated by varying a frequency of a clock due to noise from outside in a case where there is no supplied signal in a circuit which performs negative feedback control s... | 07/29/2008 |
| 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 |
| 7397314 | Redundant clock source A redundant clock source provides a stable clock source for digital system. The clock source uses two oscillators to generate a clock signal. If one of the oscillators fails, the clock signal is generated from the other oscillator until the failed oscillator is repl... | 07/08/2008 |
| 7375601 | Dual-band oscillator When two oscillation signals are output from a common terminal through switching, to reduce attenuation of the oscillation signals, a dual-band oscillator includes a first oscillating transistor for generating an oscillation signal in a first frequency band; a first... | 05/20/2008 |
| 7373113 | Frequency generation apparatus and method for data transmission A reference frequency generation method and apparatus for communication systems that transmit and receive data by use of an ultra wide band of at least two frequency groups having at least two reference frequencies. The method and apparatus generate the reference fr... | 05/13/2008 |
| 7362188 | System-on-a-chip (SoC) clock management—a scalable clock distribution approach System and method for providing clocks to digital circuitry with a need for multiple clocks. A preferred embodiment comprises an oscillator controller (oscillator clock domain block 305) distributes a system clock generated by an oscillator to a plurality of ... | 04/22/2008 |
| 7358715 | Semiconductor integrated circuit By mounting, on a semiconductor integrated circuit, a clock stability waiting circuit 4 for deciding whether a clock signal generated by a high speed clock generating circuit 2 is stable or not, a scan pass control circuit 7 capable of switching... | 04/15/2008 |
| 7352252 | Circuit and method to measure threshold voltage distributions in SRAM devices A circuit for inline testing of memory devices which provides information on the variation of the threshold voltage. The circuit includes an array of ring oscillators with a series of inverters, which already exist in the memory device. A control logic systematicall... | 04/01/2008 |
| 7353011 | Method and apparatus for operating a PLL for synthesizing high-frequency signals for wireless communications A method and apparatus for synthesizing high-frequency signals, such as wireless communication signals, includes a phase-locked loop (PLL) frequency synthesizer with a variable capacitance voltage controlled oscillator (VCO) that has a discretely variable capacitanc... | 04/01/2008 |
| 7342465 | Voltage-controlled oscillator with stable gain over a wide frequency range An apparatus and method for providing a stable gain over wide frequency range in a VCO are presented. A VCO uses a waveform generator along with a bias generator having a frequency select input. The frequency select input is used to adjust the amount of output curre... | 03/11/2008 |
| 7340366 | Method and apparatus of temperature compensation for integrated circuit chip using on-chip sensor and computation means A method and apparatus of temperature compensation for an integrated circuit using on-chip circuits, sensors, and an algorithm. The chip includes an on-chip reference circuit, an on-chip sensor measuring a parameter relative to the reference, and an on-chip computat... | 03/04/2008 |
| 7332977 | Crystal clock generator operating at third overtone of crystal's fundamental frequency A crystal oscillator operates at the third overtone of the crystal's fundamental frequency. A value of a shunt resistor between the two phase-shift leg nodes is chosen so that the absolute value of the product gm×(Xc1)×(Xc2) is greater than the effec... | 02/19/2008 |
| 7332978 | Glitch free controlled ring oscillator and associated methods A glitch free controlled ring oscillator may comprise a programmable delay chain connected to a gating and inverter stage or means. A latch or latching means may be provided between the delay chain and the gating and inverter stage or means for registering the clock... | 02/19/2008 |
| 7321978 | Overclock detection An overclock detector may define a plurality of detection periods based upon a reference clock signal. Further, the overclock detector may activate an overclock response in response to determining an operating clock signal generating too many cycles in each of a plu... | 01/22/2008 |
| 7315213 | Semiconductor device and voltage-controlled oscillation circuit A voltage-controlled oscillation circuit (15) includes a plurality of independent ring oscillation circuits different in the number of stages; and a selector (22) selectively outputting as a feedback clock signal (FB) an output of one of the ring oscil... | 01/01/2008 |
| 7315939 | Microcomputer having clock control circuit and initializing method thereof To provide a microcomputer which is improved to enable the functional selection of a functional macro and the characteristic correction without the mask option, trimming, and dedicated terminal and to quickly start the execution of the microcomputer. The microcomput... | 01/01/2008 |
| 7315957 | Method of providing a second clock while changing a first supplied clock frequency then supplying the changed first clock Methods, circuits, and apparatus for changing a frequency of a clock signal provided to a graphics memory while reducing any resulting visual glitch or disturbance on a monitor. A specific embodiment provides multiple clock sources that may be multiplexed or selecte... | 01/01/2008 |
| 7307482 | Ring oscillator setting apparatus and method depending on environmental changes of an image formation apparatus A ring oscillator setting apparatus and method depending on an environmental change of an image formation apparatus is provided. The apparatus includes a plurality of ring oscillators for generating different oscillation frequencies. The apparatus further includes a... | 12/11/2007 |
| 7307481 | Minimum synchronization frequency discriminator A minimum frequency synchronization discriminator for use in providing a clock signal for a switch mode power supply automatically detects when the frequency of a sync signal is above a minimum frequency and causes the sync signal to serve as the clock signal for th... | 12/11/2007 |
| 7296170 | Clock controller with clock source fail-safe logic A microcontroller integrated circuit with a clock controller and a processor automatically switches the source of the clock signal that clocks the processor from a failed fast external precision oscillator to a slow internal backup oscillator, then enables a fast in... | 11/13/2007 |
| 7292108 | Voltage controlled oscillator for frequency synthesizer The voltage controlled oscillator includes an oscillating transistor, and first and second inductance elements which are connected in series and provided between an output terminal of the oscillating transistor and a high frequency ground point Vcc. Oscillating sign... | 11/06/2007 |
| 7283009 | Dual band voltage-controlled oscillator A resonance circuit is interposed between a base and a collector of an oscillating transistor and is configured such that a resonance frequency is switched in correspondence with two different frequency bands. A first feedback unit is interposed between the base and... | 10/16/2007 |
| 7278047 | Providing different clock frequencies for different interfaces of a device A method for operating a device (such as a printer) having a first interface (such as USB interface) connectable to a first computer and a second interface (such as an Ethernet interface) connectable to a second computer. A phase lock loop (PLL) circuit is obtained ... | 10/02/2007 |
