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| Number | Title | Issue Date |
| 8188797 | Adjustable electrical components formed from arrays of differential circuit elements Adjustable circuit components may be formed from arrays of differential circuit elements such as differential capacitors and differential current sources. The differential circuit elements may each have a control input. The differential circuit elements in each arra... | 05/29/2012 |
| 8115558 | Digital PLL circuit and semiconductor integrated circuit A digital PLL circuit includes: an oscillation circuit, wherein an oscillation frequency is controlled by changing the number of capacitance elements to be connected in parallel to an inductance element; and a phase comparator part configured to perform a digital ph... | 02/14/2012 |
| 8106714 | Adjustable capacitor, digitally controlled oscillator, and all-digital phase locked loop An adjustable capacitor is provided including a capacitor unit including a plurality of capacitor groups aligned in a matrix format and a switch unit to adjust capacitance by connecting the plurality of capacitor groups in parallel according to a selection signal of... | 01/31/2012 |
| 7847642 | Frequency tuning circuit, use of the tuning circuit and method for frequency tuning A frequency tuning circuit includes a connection for coupling to a signal tap of an element which has a resonant frequency. The tuning circuit contains a controllable-capacitance capacitance array for tuning of a signal frequency of the element. The capacitance arra... | 12/07/2010 |
| 7800454 | Digital controlled oscillator A digital controlled oscillator including a programmable current source, a first variable capacitor and a second variable capacitor. A comparator compares the voltage across the variable capacitors with a reference voltage level and generates a DCO output clock sign... | 09/21/2010 |
| 7764127 | High resolution digitally controlled oscillator This disclosure describes designs for a digitally controlled oscillator (DCO). The DCO can overcome many of the shortcomings associated with conventional voltage controlled oscillators (VCOs), and may improve wireless communication devices. The described DCO may imp... | 07/27/2010 |
| 7741920 | Quadrature oscillator with simplified amplitude, phase and frequency control An oscillator circuit providing quadrature outputs and enabling instantaneous control over phase, frequency and amplitude of the output waveforms is disclosed. In one embodiment, the oscillator circuit comprises an oscillation loop, at least one capacitor switching ... | 06/22/2010 |
| 7639092 | Crystal oscillator frequency tuning circuit Embodiments feature techniques and systems for analog and digital tuning of crystal oscillators. In one aspect, some implementations feature a method for tuning a frequency of a crystal oscillator that can include adjusting the tuning frequency of the crystal oscill... | 12/29/2009 |
| 7605668 | Delay stage with controllably variable capacitive load Disclosed herein are embodiments of controllably variable capacitor loads that may be used with delay stages or other elements, for example, in a voltage controlled oscillator. ... | 10/20/2009 |
| 7602256 | Systems and techniques for auto-calibration and fast tuning of voltage controlled oscillators in phase-lock loops Systems, circuits, and techniques for the calibration and fast tuning of VCOs in PLLs are provided. Information for coarse tuning before normal operation are calculated and stored. These systems and techniques decrease significantly the time needed for a PLL to tran... | 10/13/2009 |
| 7589596 | Voltage controlled oscillator and wireless transceiver using the same The capacitance of the capacitor with the constant capacitance is equivalently reduced in the capacitance of a resonant capacitor in a voltage control oscillator to increase the variable amount of the capacitance of the resonant capacitor, and to expand an oscillati... | 09/15/2009 |
| 7528667 | T-network capbank A capacitor bank adapted to provide a variable capacitance to an electronic circuit is provided. The capacitor bank has at least a most significant bit and a least significant bit and includes a first capacitor cell having a first capacitance value and disposed betw... | 05/05/2009 |
| 7511582 | Voltage controlled oscillator for use in phase locked loop The present invention provides a clock circuit to produce a Reference Clock Signal used to latch data between first bit stream(s) and second bit stream(s), wherein the number and bit rate of the first bit stream(s) and the second bit stream(s) differ. The VCO genera... | 03/31/2009 |
| 7501903 | Frequency adjustment techniques in coupled LC tank circuits CMOS LC tank circuits and flux linkage between inductors can be used to distribute and propagate clock signals over the surface of a VLSI chip or μprocessor. The tank circuit offers an adiabatic behavior that recycles the energy between the reactive elements and mi... | 03/10/2009 |
| 7492229 | Method and apparatus to improve frequency stability of an integrated circuit oscillator A simple low cost integrated circuit oscillator includes a capacitor coupled to be charged and discharged by first and second current sources. A first voltage follower circuit including a first bipolar transistor having a base is coupled to the capacitor. The first ... | 02/17/2009 |
| 7449964 | System and method for tuning output drivers using voltage controlled oscillator capacitor settings The present invention provides a method for tuning output drivers to an operating frequency based on settings used to tune other devices within the device such as a VCO. First the VCO within a PLL and clock circuit is tuned to the desired operating frequency. This o... | 11/11/2008 |
| 7439819 | Piezoelectric-oscillator Deterioration in frequency stability with time in a conventional piezoelectric oscillator using an accumulation type MOS capacitance element is improved. A P-channel transistor type or an N-channel transistor type is used as a MOS capacitance element in a variable c... | 10/21/2008 |
| 7414482 | Resonance mode selection using a resonator-synchronized second-order oscillator A resonator-synchronized oscillator for resonance mode selection is disclosed. In one embodiment, the resonator-synchronized oscillator comprises an oscillation loop, at least one capacitor switching circuit coupled to the oscillation loop, and a multi-mode resonato... | 08/19/2008 |
| 7408422 | Variable-capacitance circuit element An electronic circuit element has two capacitance values selected by means of a main control signal. The electronic circuit element comprises two variable-capacitance electronic components connected in parallel and each receiving opposite intermediate control signal... | 08/05/2008 |
| 7400209 | Oscillator circuit Present invention relates to an oscillator circuit comprising: resonator means (102) and, first and second emitter followers (116, 118) being symmetrically coupled to the resonator means and been connected to further emitter followers (120, 122)... | 07/15/2008 |
| 7400206 | Clock circuit with programmable load capacitors In one embodiment, the present invention includes methods and apparatus for providing initial control values to programmable load capacitors of an oscillator, such as that of a real time clock circuit. Using the initial values, the real time clock circuit may begin ... | 07/15/2008 |
| 7397319 | Apparatus and method for phase lock loop gain control A gain compensator compensates for the gain variation of a varactor-tuned voltage tuned oscillator (VCO) in a phase lock loop (PLL). The VCO includes a parallel LC circuit having multiple fixed capacitors that can be switched-in or switched-out of the LC circuit acc... | 07/08/2008 |
| 7391272 | Voltage controlled oscillator with full adder A voltage controlled oscillator includes a resonant circuit, a trimming capacitor and a full adder. The resonant circuit includes a negative resistor, an inductor and an oscillation frequency setting capacitor having a variable capacitance according to a controlled ... | 06/24/2008 |
| 7388439 | Low pass filter and electronic device The electronic device (100) of the invention comprises a semiconductor device (30) and a low-pass filter (20), which are present in a stacked configuration, and which together include a phase locked loop. The low-pass filter is preferably embodi... | 06/17/2008 |
| 7388446 | Directly modulated CMOS VCO A variable capacitor modulator for use in a voltage controlled oscillator, includes a differential varactor block, coupling capacitors for connecting nodes of the varactor block to a tank circuit, and an element connected between the respective nodes and ground to t... | 06/17/2008 |
| 7385539 | All-digital phase locked loop (ADPLL) system An all-digital phase locked loop system for generating an oscillator output signal under control of a digital reference input. The system comprises a digitally controlled oscillator, a digital loop filter for generating a multiple bit digital control signal for the ... | 06/10/2008 |
| 7382207 | Oscillator circuit suppressing variation of oscillation frequency An oscillator circuit includes: oscillating transistors; a resonance circuit that includes varactor diodes each having a cathode to which a control voltage for controlling an oscillation frequency is applied and that is coupled between a collector and a base of each... | 06/03/2008 |
| 7372343 | Oscillator circuit The invention is directed to an oscillator circuit in which a frequency-determining resonant circuit includes an inductive element, a first capacitive element and at least one second capacitive element which is connected in series with the first capacitive element. ... | 05/13/2008 |
| 7370214 | Automatically switching power supply sources for a clock circuit In one embodiment, a power supply switching circuit may automatically provide power to a clock circuit from one of an auxiliary power supply and a main power supply, based on a voltage of the main power supply. To provide automatic switching, a switch circuit couple... | 05/06/2008 |
| 7365610 | Push compensation in an oscillator The effect of supply voltage variations on an oscillator circuit output are compensated for to reduce supply pushing. The change in a value of a first capacitance in a first direction in response to the variation in the supply voltage is canceled using one or more d... | 04/29/2008 |
| 7362192 | Low noise voltage-controlled oscillator Oscillator circuits for reducing phase noise are described in this disclosure. In one embodiment, an oscillator circuit includes a pair of cross-coupled transistors, including a first transistor and a second transistor, a first inductor in communication with a contr... | 04/22/2008 |
| 7358825 | Variable capacitance circuit arrangement A variable capacitance network is disclosed, comprising a plurality of capacitance arms connected in parallel with each other between first and second terminals of the network. Each capacitance arm has a varactor and a series capacitor in series with the varactor A ... | 04/15/2008 |
| 7358823 | Programmable capacitors and methods of using the same In a first aspect, a first method of adjusting capacitance of a semiconductor device is provided. The first method includes the steps of (1) providing a transistor including a dielectric material having a dielectric constant of about 3.9 to about 25, wherein the tra... | 04/15/2008 |
| 7355486 | Current controlled oscillation device and method having wide frequency range A current controlled, phase locked loop device includes a phase detector configured to compare a reference frequency to an output frequency of a current controlled oscillator (ICO), a charge pump coupled to the phase detector and a low pass filter coupled to the cha... | 04/08/2008 |
| 7355490 | Receiver having no tracking error A receiver includes an up/down counter that controls turning on/off of individual switching units, and a count signal generator that compares a control voltage with a first reference voltage and a second reference voltage lower than the first reference voltage and o... | 04/08/2008 |
| 7352255 | Circuit, system, and method for fine tuning crystal frequency accuracy Circuits, systems, and methods for fine tuning crystal frequency accuracy are disclosed. One such circuit fine tunes crystal frequency accuracy with a tunable fractional capacitance. The circuit includes an effectively constant capacitance coupled, e.g., fixedly, wi... | 04/01/2008 |
| 7352297 | Method and apparatus for efficient implementation of digital filter with thermometer-code-like output A technique is disclosed for processing a binary coded signal to generate a thermometer coded signal. Such technique includes the following steps. A binary coded input signal is obtained. A binary arithmetic operation is performed on a least significant bit (LSB) po... | 04/01/2008 |
| 7348861 | Method and apparatus for a crystal oscillator to achieve fast start-up time, low power and frequency calibration One embodiment of the present invention includes a frequency generation circuit including a control module, an oscillator circuit coupled to the control module, the oscillator circuit having a start-up time defined by the time required to reach a desired frequency. ... | 03/25/2008 |
| 7339420 | Method of switching PLL characteristics and PLL circuit A loop filter which is a component of a PLL circuit includes a switching element for switching a capacitance value which connects and disconnects a second capacitive element to a first capacitive element according to a natural angular frequency switching signal, and... | 03/04/2008 |
| 7336134 | Digitally controlled oscillator A tunable oscillator suitable for use in a frequency synthesizer of a transceiver is controlled by varying one or more parameters associated with the oscillator. In particular, a digital control signal affects one or more of the capacitances of the oscillator, the b... | 02/26/2008 |
