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| Number | Title | Issue Date |
| 8138844 | System and method for crystal oscillator frequency tuning An oscillator may include a crystal resonator, an inverter coupled in parallel with the crystal resonator, a first switched capacitor coupled to a first terminal of the crystal resonator, a second switched capacitor coupled to a second terminal of the crystal resona... | 03/20/2012 |
| 8115562 | Oscillation circuit and method of controlling same Disclosed is an oscillator in which current consumption relating to oscillation is reduced. The oscillator comprises: an amplifier to an input and output of which a piezoelectric oscillator and a feedback resistor are connected in parallel, and which is constituted ... | 02/14/2012 |
| 8044730 | Secondary vibration damping type crystal oscillator circuit A secondary vibration damping type crystal oscillator circuit is formed as a Colpitts type, in which a crystal unit is connected between base and collector terminals, a first capacitor is connected between emitter and collector terminals, and a second capacitor is c... | 10/25/2011 |
| 7940137 | Systems and methods with reduced reference spurs using a crystal oscillator for broadband communications Systems and methods are provided. In this regard, a representative system incorporates a crystal oscillator circuit and a digital automatic level control circuit. The digital automatic level control circuit is operative to: convert an oscillation amplitude of the cr... | 05/10/2011 |
| 7928810 | Oscillator arrangement and method for operating an oscillating crystal The oscillator arrangement (1) comprises a differential amplifier (13) and also a first and a second terminal (2, 3). The first terminal (2) of the oscillator arrangement (1) can be coupled via a quartz resonator (10) to the... | 04/19/2011 |
| 7852164 | Piezoelectric oscillator A piezoelectric oscillator includes: a piezoelectric resonator; an oscillation circuit including a variable resistance circuit and a transistor for oscillation; a constant current circuit, the constant current circuit including a first current mirror circuit, and a ... | 12/14/2010 |
| 7804374 | Feedthrough capacitance compensation for resonant devices A device has a resonator coupled to input and output nodes, the resonator being characterized by a transducer to drive the output node, and further characterized by a feedthrough capacitance such that portions of the input signal bypass the transducer to allow a spu... | 09/28/2010 |
| 7557666 | Oscillation circuit An oscillation circuits includes an oscillation unit 30 for generating an internal clock signal having an amplitude of vibration corresponding to an internal power supply voltage thereof, switches 28, 29, a NMOS 13 of a tolerant input circuit, a... | 07/07/2009 |
| 7548128 | Systems and methods with reduced reference spurs using a crystal oscillator for broadband communications Systems and methods are provided. In this regard, a representative system incorporates a crystal oscillator circuit and a digital automatic level control circuit. The digital automatic level control circuit is operative to: convert an oscillation amplitude of the cr... | 06/16/2009 |
| 7439820 | Reducing the settling time of a crystal oscillator A method and system for initiating the oscillation of a crystal that controls a crystal oscillator by applying an initiating pulse to said crystal. The initiating pulse having a pulse width less than one half the periodicity of said crystal. ... | 10/21/2008 |
| 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 |
| 7432772 | Electrical oscillator circuit and an integrated circuit An electrical oscillator circuit (301, 302) comprising: a resonator (303) comprised in the first subcircuit (301); and an active device (309) comprised in the second subcircuit (302) connected to energize the resonator (303)... | 10/07/2008 |
| 7429900 | Oscillator and semiconductor device An object is not only to contribute to reduction in current consumption but also to advance actuation of a system required in a camera, an on-vehicle electric component, etc. by shortening a waiting time for stabilization of oscillation. An oscillator having an inve... | 09/30/2008 |
| 7417512 | Dual mode tuning digitally controlled crystal oscillator and operation method thereof A dual mode tuning digitally controlled crystal oscillator includes a crystal resonator, an oscillation circuit, a coarse mode tuning unit and a fine mode tuning unit. The crystal resonator resonates at substantially a predetermined resonance frequency. The oscillat... | 08/26/2008 |
| 7411467 | Overtone crystal oscillator automatic calibration system An overtone crystal oscillator automatic calibration system including an overtone crystal oscillator with multiple programmable resistors and multiple amplifiers with supply voltage inputs and a calibration system. The calibration system adjusts the programmable res... | 08/12/2008 |
| 7411466 | Coil-less overtone crystal oscillator An overtone crystal oscillator including a crystal, multiple amplifiers and an RC network. The crystal has a fundamental resonance frequency and at least one overtone resonance frequency. The amplifiers are coupled in series between terminals of the crystal and the ... | 08/12/2008 |
| 7398163 | Sensing apparatus An object of the present invention is to provide a sensing instrument capable to detect a substance existing in a very small quantity, such as environmental pollutants, instantly with a high degree of precision. As a specific means for solving the problem, a frequen... | 07/08/2008 |
| 7391279 | Inverting amplifier and crystal oscillator having same A bypass capacitance is connected to a node between first and second self-bias resistances connected in series between an input and an output of an inverter. The bypass capacitance accommodates changes in the output voltage of the inverter to suppress the feedback e... | 06/24/2008 |
| 7391278 | Oscillator with stacked amplifier Embodiments of the invention provide a low-power, high-gain amplifier for a crystal oscillator. In some embodiments, the oscillator amplifier circuit comprises two NMOS transistors stacked in series with a PMOS transistor. In various embodiments, each of the NMOS tr... | 06/24/2008 |
| 7388445 | Piezoelectric oscillator for quadrature modulation A quartz oscillator for quadrature modulation has a quartz oscillating circuit including a transistor, a quartz oscillator, a capacitor, and a resistor, a double-mode quartz filter, a reactance element, and an amplifier. The quartz oscillator is constituted so that ... | 06/17/2008 |
| 7375600 | Integrated quartz oscillator circuit An integrated quartz oscillator circuit is disclosed having a capacitive voltage divider, which has a first capacitor and a second capacitor, as well as having a first transconductance amplifier, which is placed in a loop connecting a first terminal and a second ter... | 05/20/2008 |
| 7372342 | Oscillator A high-performance crystal oscillator providing effective bias resistors with low power consumption and minimal substrate surface area. In various embodiments of the invention, a switched-capacitor resistor is operably coupled to circuit components, such as an oscil... | 05/13/2008 |
| 7369009 | Oscillator device for frequency modulation The present invention pertains to an oscillator arrangement for carrying out a frequency modulation process, wherein an oscillator (1) with automatic amplitude control (5, 6, 7) is provided. The shift keying is not realized with reconnectable capacitan... | 05/06/2008 |
| 7369006 | Applied voltage control circuit for voltage controlled oscillation circuit When a power supply is turned on, an NPN transistor is disconnected, a first transmission gate is conducted, a second transmission gate is disconnected, and a power-supply voltage is applied to a control input terminal of a voltage controlled oscillation circuit via... | 05/06/2008 |
| 7369005 | Colpitts oscillator Oscillation in which unwanted vibration (B mode) is surely suppressed while stable oscillation by principal vibration (C mode) is obtained is obtained. In a Colpitts oscillator including a piezoelectric vibrator, a transistor, and a first and second divided capaciti... | 05/06/2008 |
| 7352256 | Crystal oscillation circuit A crystal oscillation circuit can correctly suppress the resonance of a B mode, thereby correctly excite the resonance of a C mode. Since the crystal oscillation circuit uses a quartz oscillator of an SC cut or an IC cut, the B mode (unnecessary mode) frequency is c... | 04/01/2008 |
| 7352262 | Insulation of anti-resonance in resonators A cancellation circuit to remove the anti-resonance signal from a resonator. Micro-mechanical and surface and bulk acoustic wave resonators include an anti-resonance in an output signal. This has an undesirable effect on certain types of systems in their function an... | 04/01/2008 |
| 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 |
| 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 |
| 7342300 | Integrated circuit incorporating wire bond inductance The invention relates to the field of electronics, more particularly to the wire bonds incorporated into an integrated circuit package such as a quad flat pack, a ball grid array or hybrid style module. The present invention takes the normally undesirable wire bond ... | 03/11/2008 |
| 7339441 | Circuit and method for quickly turning off MOS device An OTA driving an MOS device needs to turn it off quickly to minimize overshoot during a heavy to light load state. The drains of the MOS device can be used to accelerate turning off the MOS device. A first drain is connected to the gate of the MOS device. A second ... | 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 |
| 7327200 | Device for operating a vibrating unit of a vibration resonator A device for operating an oscillatable unit of a vibration resonator, including a piezodrive, which is connected with the oscillatable unit, and feedback electronics. The feedback electronics excites the piezodrive to oscillate by means of a periodic exciter signal ... | 02/05/2008 |
| 7321272 | Device for detecting the temperature of an oscillator crystal In a device for detecting the temperature of an oscillator crystal 2, arranged on a carrier, in particular in a mobile radio apparatus, the detected temperature should be as exact as possible a replica of the temperature to which the oscillator crystal 2 | 01/22/2008 |
| 7301407 | Capacitor bank and voltage controlled oscillator having the same A capacitor bank includes a first node, a second node, first blocking capacitors, N first AMOS varactors, second blocking capacitors and N second AMOS varactors. The first blocking capacitors have first terminals connected to the first node and second terminals wher... | 11/27/2007 |
| 7295822 | Radio wave receiver, radio-controlled timepiece and tuning capacitance setting method A radio wave receiver for receiving radio waves having a predetermined frequency, the receiver comprises an antenna, an variable capacitor connected to the antenna, a memory, and a controller which determines an optimum capacitance of the variable capacitor with whi... | 11/13/2007 |
| 7292117 | Temperature-compensated piezoelectric oscillator A temperature compensated piezoelectric oscillator includes: an oscillation circuit that drives a piezoelectric element with a current; a direct-current-stopping fixed capacitor; a frequency-temperature compensated circuit that compensates the deviation of an oscill... | 11/06/2007 |
| 7292114 | Low-noise high-stability crystal oscillator Circuits, methods, and apparatus that provide low-noise, high-stability crystal oscillators having controlled-amplitude differential output signals and DC level control. A crystal oscillator circuit has two feedback loops, one for setting the DC level of its signals... | 11/06/2007 |
| 7286023 | Crystal oscillation circuit with frequency regulation It is an object of the invention to obtain a stable operation with a low phase noise. Moreover, it is another object to obtain an oscillating output which does not cause the delay of a starting time. According to the invention, it is possible to implement a crystal ... | 10/23/2007 |
| 7283006 | Voltage-controlled oscillator An oscillator circuit configured by a feedback resistance 1, an amplifier 2 and a quartz vibrator 3 has a load resistance. MOS transistors 5, 6 short-circuited at source and drain terminals has a capacitance, as a variable capacitance, oc... | 10/16/2007 |
