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| Number | Title | Issue Date |
| 8120439 | Fast start-up crystal oscillator An exemplary fast start-up crystal oscillator with reduced start-up time. The exemplary oscillator reduces the start-up time (i.e., the time taken to attain sustained stable oscillations after the power is turned on) by increasing the negative resistance of a circui... | 02/21/2012 |
| 8102217 | Oscillator having feedback path which is capable of supplying reduced voltage potential to oscillation circuit An oscillator creates a reference voltage based on a pulse signal corresponding to an oscillation output of a crystal oscillation circuit and controls a supply voltage to the crystal oscillation circuit according to the reference voltage. A control signal creating c... | 01/24/2012 |
| 7948329 | Oscillator gain circuit and method A gain circuit of an oscillator circuit includes an inverter portion having an input IN and an output OUT arranged for connection to an external feedback circuit comprising a pi network. A feedback member having a first resistive element is coupled between the input... | 05/24/2011 |
| 7859351 | Driver device, physical quantity measuring device, and electronic instrument An oscillation driver circuit includes a current-voltage converter which converts a current value of an oscillation signal in an oscillation loop into a voltage value, and a comparator which outputs a signal corresponding to the result of comparison between the outp... | 12/28/2010 |
| 7859353 | Oscillator and driving circuit and oscillation method thereof An oscillator, a driving circuit and an oscillation method are provided. The driving circuit and a crystal are coupled in parallel to generate a clock signal. The driving circuit includes a buffer unit and a control unit. The buffer unit is coupled in parallel to th... | 12/28/2010 |
| 7859352 | Systems and methods to overcome DC offsets in amplifiers used to start resonant micro-electro mechanical systems Systems and methods for insuring successful initiation of a resonating micro-electro mechanical systems (MEMS). An example system includes a resonating sensor, a drive device, a charge amplifier, and a voltage gain circuit. At start up, the charge amplifier and volt... | 12/28/2010 |
| 7812682 | Crystal-based oscillator for use in synchronized system A crystal oscillator-based module, which includes a crystal resonator receiving a conditioned signal from a first bus and passing a resonator signal to a sustaining stage amplifier. A synchronization range expansion circuit is connected between a gain control networ... | 10/12/2010 |
| 7812681 | Driver device, physical quantity measuring device, and electronic instrument An oscillation driver circuit includes a gain control amplifier which causes a vibrator to produce driving vibrations by controlling an oscillation amplitude in an oscillation loop, and a comparator which generates a synchronous detection reference signal based on a... | 10/12/2010 |
| 7598821 | Amplitude controlled quartz oscillator with broad voltage and temperature range The invention concerns an oscillator including an input terminal, an output terminal, a resonator, and an oscillator circuit including: first and second power supply terminals, two capacitors connected between the first power supply terminal and the input terminal, ... | 10/06/2009 |
| 7573346 | Oscillation circuit capable of having stable oscillation in wide temperature range An oscillation circuit includes a constant current source, a current mirror circuit configured to receive a constant input current from the constant current source and to output a current proportional to the constant input current, a first inverter configured to be ... | 08/11/2009 |
| 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 |
| 7355489 | High gain, high frequency CMOS oscillator circuit and method An oscillator amplifier circuit is provided. The amplifier circuit can be used with a resonator to amplify and form a resonating oscillator. The amplifier circuit comprises an active circuit which includes an inverter and a current-controlled biasing circuit. One tr... | 04/08/2008 |
| 7332979 | Low noise reference oscillator with fast start-up A frequency source having a fast start-up time and low noise in steady state is presented. The frequency source includes an oscillator and a hybrid automatic gain control (AGC) loop that switches between an analog AGC loop at oscillator start up and a digital AGC lo... | 02/19/2008 |
| 7310026 | Semiconductor integrated circuit with function to detect state of stable oscillation A semiconductor integrated circuit includes a reference-voltage circuit configured to produce a predetermined reference voltage at an output node thereof, a comparator, coupled to a node to which an oscillating signal is supplied and to the output node of the refere... | 12/18/2007 |
| 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 |
| 7276984 | Oscillation circuit capable of having stable oscillation in wide temperature range An oscillation circuit includes a constant current source, a current mirror circuit configured to receive a constant input current from the constant current source and to output a current proportional to the constant input current, a first inverter configured to be ... | 10/02/2007 |
| 7227426 | Using hysteresis to generate a low power clock A real time clock that operates an oscillator within a predetermined range by employing a constant current source. The remaining real time clock logic can be operated at a voltage that is relative to the constant current. Power consumption of the oscillator can be c... | 06/05/2007 |
| 7187245 | Amplitude control for crystal oscillator Circuits and methods for controlling the amplitude of oscillation of a crystal. In one example, a circuit may include a peak detector; a first voltage-to-current converter; a first current-to-voltage converter coupled with the first voltage-to-current converter; a s... | 03/06/2007 |
| 7119590 | Scalable integrated circuit architecture An integrated circuit architecture comprises a phase lock loop (PLL) circuit that includes a feedback circuit that receives a reference signal. A voltage controlled oscillator (VCO) generates an output signal to an input of the feedback circuit. A master transistor ... | 10/10/2006 |
| 7034628 | Crystal oscillator circuit having a start-up time reduction circuit A quartz-crystal oscillator circuit substantially reduces the start-up time of the crystal oscillator circuit by utilizing a start-up time reduction circuit that adds additional gain to the crystal oscillator circuit during the start-up period, and removes the addit... | 04/25/2006 |
| 7005934 | Crystal oscillator with temperature compensated through a vibrator current control circuit The invention provides a temperature compensated crystal oscillator that can obtain a large variable range and that can obtain high temperature stability. This temperature compensation system employs a configuration comprising a oscillation circuit 12 includi... | 02/28/2006 |
| 6998888 | Scalable integrated circuit architecture with analog circuits An integrated circuit architecture includes a phase lock loop (PLL) circuit that includes a feedback circuit that receives a reference signal. A voltage controlled oscillator (VCO) has an output that communicates with an input of the feedback circuit. A master trans... | 02/14/2006 |
| 6946918 | Differential voltage to current converter having transistors of different sizes A voltage/current converting circuit has a differential circuit. The differential circuit has a first input terminal coupled to receive an input voltage signal, a second input terminal coupled to receive a reference voltage signal and an output terminal for outputti... | 09/20/2005 |
| 6946923 | Wide range crystal oscillator A structure and associated method to allow an oscillator circuit to operate with a plurality of different crystals. The oscillator circuit comprises a semiconductor device and a crystal. The semiconductor device comprises a primary inverting amplifier and a crystal ... | 09/20/2005 |
| 6794949 | Frequency generating device and method thereof A system and method of varying frequency is disclosed. A first oscillator in a phase-locked loop (PLL) maintains a first frequency as part of the PLL lock. A second oscillator having a control coupled to the PLL can be modified to generate a frequency different than... | 09/21/2004 |
| 6741137 | High quality serial resonance oscillator A highly stable single chip resonator controlled oscillator with automatic gain control designed for manufacture in monolithic integrated circuit technologies. An automatic gain controller monitors the output of a crystal controlled oscillator amplifier and produces... | 05/25/2004 |
| 6606007 | Crystal oscillator with minimized Q reduction A circuit and method are disclosed herein for a crystal oscillator, wherein the Q of the resonant network is not reduced through the loading effects of the oscillator's resistive bias network. The oscillator is configured as an operational transconductanc... | 08/12/2003 |
| 6278338 | Crystal oscillator with peak detector amplitude control A crystal oscillator apparatus is described that has a wide dynamic frequency range and that is capable of supporting a broad range of crystal types. The present invention reduces the unwanted side effects that are associated with the prior art crystal os... | 08/21/2001 |
| 6137374 | Low power clock oscillator A low power clock oscillator circuit for driving microprocessors and other digital circuits is provided. The clock oscillator includes a resonant network for providing a sinusoidal waveform at a predetermined frequency. A first amplifier for amplifying th... | 10/24/2000 |
| 6133801 | Crystal oscillation circuit A crystal oscillation circuit includes a main oscillation circuit, an auxiliary oscillation circuit, and a control circuit. The main oscillation circuit has a crystal resonator. The auxiliary oscillation circuit increases an exciting current of the crysta... | 10/17/2000 |
| 5999062 | Crystal oscillator driver with amplitude control A crystal oscillator drive circuit controls the maximum amplitude of the drive signal to a crystal by limiting the bias current of a gm cell which senses the oscillation amplitude of the crystal. The bias current is commutated by the gm cell responsive to... | 12/07/1999 |
| 5805923 | Configurable power management system having a clock stabilization filter that can be enabled or bypassed depending upon whether a crystal or can oscillator is used A power management system is disclosed. The system includes an oscillator interface for use in a power management system, a power recycle circuit for use in a power management system, a pad clock and self test for use in a power management system, a clock... | 09/08/1998 |
| 5770980 | Fast starting oscillator A low power, fast starting oscillator (10) of the Colpitts type includes an amplifier (12) that provides voltage gain and feeds a source follower circuit (14) that provides a desirable output impedance. A crystal (16) is coupled from an output of the sour... | 06/23/1998 |
| 5557243 | Oscillation circuit with power limiting controller An oscillation circuit employs a piezo-electric crystal connected in parallel with an amplifier having a gain equal to or less than that needed to maintain a steady-state operation of the amplifier when operated at the maximum output. One or more controll... | 09/17/1996 |
| 5512863 | Method of minimizing the aging and radiation induced frequency shifts of quartz oscillators The aging and radiation induced frequency shifts of quartz crystal oscillrs are minimized by using oscillator circuits in which the DC voltage applied to the quartz crystal is about zero. This results in reduced movement of impurity ions which generally ... | 04/30/1996 |
| 5331296 | Oscillator having controllable frequency compensation for suppressing undesired frequency of oscillation A low-power crystal oscillator circuit is disclosed that includes an amplifier section having a switchable compensation network. In one embodiment, the oscillator circuit incorporates inverter amplifiers to generate a square-wave output signal that can be... | 07/19/1994 |
| 5208558 | Crystal oscillator having plural inverters disabled after start-up An oscillation circuit having a clocked inverter operating during a predetermined period of time after the start of the oscillation. A feedback circuit is formed by the clocked inverter and another inverter at the start time of the oscillation. The oscill... | 05/04/1993 |
| 5150081 | Integrated crystal oscillator with circuit for limiting crystal power dissipation On an integrated circuit, a power limiting circuit is added to a crystal oscillator for limiting power dissipation in the crystal to a prescribed safe power dissipation range. The power limiting circuit includes a Pierce design crystal-controlled oscillat... | 09/22/1992 |
| 4745376 | Fault tolerant oscillator circuit having redundant resonant elements An oscillator having a multiplicity of resonant structures parallel coupled to form a fault tolerant resonator in the feedback circuit of the oscillator. This fault tolerant resonator permits the oscillator to operate in a near fault free manner after the... | 05/17/1988 |
