Class / Patent application number | Description | Number of patent applications / Date published |
331008000 | Transistorized controls | 28 |
20090115533 | VOLTAGE CONTROLLED OSCILLATOR - A voltage controlled oscillator may include a plurality of inverting units connected in serial and connected between a first and a second voltage sources to produce an oscillating frequency. Each of the inverting units may have a first current source for producing a constant current that may determine an oscillating frequency, a switching inverter connected between the first voltage source and the first current source that may produce a current having a phase opposite to an output current from a preceding inverting unit, and a frequency adjuster that may control the oscillating frequency by charging and/or discharging the current from the inverting unit. | 05-07-2009 |
20090167442 | LOW NOISE WIDE RANGE VOLTAGE-CONTROLLED OSCILLATOR WITH TRANSISTOR FEEDBACK - An integrated circuit, a voltage controlled oscillator (VCO) and a phase-locked loop (PLL). In one embodiment, the VCO includes: (1) a voltage tune line configured to receive a tuning voltage for the VCO and (2) an odd number of ring-coupled delay elements. Each of the delay elements includes: (2A) an inverter having a power supply line being coupled to the voltage tune line and (2B) a feedback path having a gain-attenuating transistor with a gate thereof being coupled to the voltage tune line. | 07-02-2009 |
20090206936 | VOLTAGE-CONTROLLED OSCILLATOR TOPOLOGY - A voltage-controlled oscillator is implemented with a succession of delay cells coupled in series to form an oscillator loop. The oscillator loop is supplied with reference voltages produced by a voltage generator. The reference voltages produce stable operation of the voltage-controlled oscillator. Cascode reference current generators are incorporated within the voltage generator to supply a cross-coupled arrangement of pull-up devices within each delay cell. The cross-coupled pull-up devices are instrumental in producing complementary output signaling from each delay cell. A pair of cascode current generators is configured in parallel to produce a magnitude of current according to an applied voltage and be selectable for dual or single operation with a corresponding frequency determination. | 08-20-2009 |
20090278612 | 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 IN and output OUT. An offset sense and correction block (OSCB) is configured to detect a dc offset potential difference between said input IN and output OUT and to reduce the offset potential by supplying a current to said input IN. | 11-12-2009 |
20100013563 | Voltage-controlled oscillator circuit including level shifter, and semiconductor device including voltage-controlled oscillator circuit - A voltage-controlled oscillator (VCO) circuit includes a level shifter, and a semiconductor device includes the VCO circuit. The VCO circuit includes an input voltage receiver, a current mirror, and a frequency oscillator. The input voltage receiver receives a first voltage input to the VCO circuit so as to generate a first current. The current mirror copies the first current so as to generate a second current. The frequency oscillator oscillates in response to the second current. The input voltage receiver includes a level shifter and a first current generator. The level shifter shifts a voltage level of the first voltage to a voltage level of a second voltage. The first current generator generates the first current corresponding to the second voltage | 01-21-2010 |
20100214025 | Low jitter and wide-range frequency synthesizer for low voltage operation - A low jitter and wide-range frequency synthesizer for low voltage operation includes a detector to generate a detection signal based on a logic level difference between an input signal and a feedback signal, a charge pump to generate a control signal based on the detection signal, a filter to generate a tuning signal based on the control signal, a bias circuit to generate a first bias signal and a second bias signal based on the tuning signal, a controllable oscillator to generate a differential output signal based on the first and the second bias signals, a differential to single ended converter to convert the differential output signal into an output signal, and a programmable frequency divider to generate the feedback signal based on the output signal. | 08-26-2010 |
20100214026 | MILLIMETER-WAVE WIDEBAND VOLTAGE CONTROLLED OSCILLATOR - A voltage controlled oscillator-phase lock loop (VCO-PLL) system includes a voltage controlled oscillator (VCO) system implementing four-channel architecture, such that two bands support two channels; a phase-locked-loop (PLL) system; and a mixer system. The VCO system further includes a control circuit; a first cross-coupled oscillator system adapted to receive a source voltage; a second cross-coupled oscillator system adapted to receive the source voltage; and a plurality of isolation buffer systems adapted to protect the first and second cross-coupled oscillator systems. | 08-26-2010 |
20100214027 | METHOD OF COMPENSATING AN OSCILLATION FREQUENCY AND PLL - A method for compensating an oscillation frequency, a device, and a phase locked loop (PLL) is applied in the LC oscillating loop, including: sending voltage control signals to one end of a variable capacitor of an LC oscillating loop to generate oscillating signals in the LC oscillating loop through the voltage control signals; obtaining variable bias voltage that reflects changes of external parameters; and sending the variable bias voltage to the other end of the variable capacitor to compensate changes to the oscillation frequency of oscillation signals generated in the LC oscillating loop. This invention compensates the changes to the oscillation frequency of the circuit that contains the LC oscillating loop and improves the stability of the circuit oscillation frequency by sending bias voltage to one end of the variable capacitor of the LC oscillating loop. | 08-26-2010 |
20110227655 | CRYSTAL-OSCILLATOR CIRCUIT - In a crystal-oscillator circuit having a quartz crystal unit, further stabilization of output frequency change at a time of startup of the power supply is achieved. A crystal-oscillator circuit having a quartz crystal unit includes a first variable-capacitance element, which forms an oscillation loop with the quartz crystal unit, and a temperature compensation circuit which provides a first control signal for the first variable-capacitance element to compensate for a temperature characteristic of the quartz crystal unit. In addition, the crystal-oscillator circuit includes a second variable-capacitance element group, and a time constant circuit which provides a time constant signal, which changes with a predetermined time constant, for the second variable-capacitance element group as a second control signal. | 09-22-2011 |
20120038425 | Voltage controlled oscillator - A resonance part of a voltage controlled oscillator (VCO) includes variable capacitance elements where an electrostatic capacitance changes in order to adjust a resonance frequency and an inductance element, and a transistor of grounded emitter type amplifies a frequency signal inputted from the resonance part to a base terminal. A feedback part includes capacitance elements for feedback, and feedbacks a frequency signal outputted from an emitter terminal of the transistor to the transistor via the base terminal. Besides, base bleeder resistances for adjusting a bias voltage to be applied to the base terminal and the transistor are formed in a common integrated circuit, and an emitter resistance is provided outside the integrated circuit as a resistance element being a different body in order to adjust an operating point of the transistor. | 02-16-2012 |
20120194278 | TEMPERATURE CORRECTING CURRENT-CONTROLLED RING OSCILLATORS - A thermally-compensated oscillator has a current reference with an output current which relates to an ambient temperature with a first relationship, a ring oscillator having an operating frequency which relates to the ambient temperature with a second relationship, and which receives the output current of the current reference and outputs an oscillator signal, and a level shifter which receives the oscillator signal from the ring oscillator and outputs a corresponding voltage-regulated clock signal. | 08-02-2012 |
20120249248 | PHASE-CONTROLLED OSCILLATOR - An adjustable-frequency oscillator, is formed by two looped systems, functioning at the same frequency but the signals are phase shifted by 90°. Each looped system includes a phase shift device, an active element providing the gain and a resonator having a fixed phase-frequency characteristic. As the phase shift in each loop is imperatively a whole multiple of 2π, the phase shift added in each loop by the phase shift device entails that each resonator introduces a complementary phase shift to comply with the oscillation criterion. This complementary phase shift is produced at a frequency defined by the resonator, this then defining the frequency of oscillation. The frequency is adjusted by two phase shift stages, which carry out the analogue multiplication of the signals coming from the two looped systems by control voltages and the summing of these products. | 10-04-2012 |
20130120071 | TUNING VOLTAGE RANGE EXTENSION CIRCUIT AND METHOD - A circuit includes a first path including a first transistor and a first current source. The first transistor is responsive to a tuning voltage. The circuit also includes a tuning voltage range extension circuit responsive to the tuning voltage. The tuning voltage range extension circuit is configured to selectively change current supplied by the first path as the tuning voltage exceeds a capacity threshold of the first transistor. | 05-16-2013 |
20130141171 | Method to Shorten Crystal Oscillator's Startup Time - An oscillator circuit includes an amplifier including at least two terminals for receiving a crystal and an automatic amplitude control loop coupled to the amplifier including biasing circuitry switched between a first operational mode and a second operational mode. The first operational mode occurs during an initial time period and the second operational mode occurs after the initial time period is expired. The biasing circuitry includes first and second PMOS transistor circuits, each transistor circuit including an unswitched PMOS transistor and a switched PMOS transistor. Alternatively, the biasing circuitry can include first and second NMOS transistor circuits, each transistor circuit including an unswitched NMOS transistor and a switched NMOS transistor. The biasing circuitry is under control of an internally generated control signal. | 06-06-2013 |
20130194043 | LOW-POWER VOLTAGE-CONTROLLED OSCILLATOR - In one embodiment, a voltage-controlled oscillator (VCO) is provided that includes: a plurality of differential inverters coupled to form a loop, each differential inverter having a differential pair of transistors configured to steer a tail current from a current source, the current source sourcing the tail current responsive to a bias voltage, wherein each transistor in the differential pair couples to a power source through a corresponding switching-capacitor circuit; and a bias circuit configured to generate the bias voltage such that a transconductance for each transistor in the differential pairs is proportional to a factor that is a function of a ratio of transistor widths within the bias circuit. | 08-01-2013 |
20130271226 | Self-Biased Amplitude-Controlled Oscillator With Constant Harmonic Content - Oscillators are described that have a highly stable output frequency versus the variation of supply voltage and different operating conditions such as temperature. The concepts are broadly applicable to various types of oscillators. The highly stable output is achieved with the use of self biasing loops. The circuits associated with providing constant harmonic output current can be used with the concept of a phi-null oscillator to further stabilize the output frequency. | 10-17-2013 |
20130335149 | THE EFFICIENCY OF CLIPPED PULSE GENERATION - The disclosed embodiments provide a resonant oscillator circuit. The resonant oscillator circuit includes a clipping mechanism configured to clip an output voltage of a signal pulse generated by the resonant oscillator circuit to a predefined constant level. The resonant oscillator circuit also includes a feedback path configured to return energy from the clipping mechanism to an input of the resonant oscillator circuit. | 12-19-2013 |
20140002197 | OSCILLATOR ARRANGEMENT | 01-02-2014 |
20140085011 | SUPPLY REGULATED VOLTAGE CONTROLLED OSCILLATOR INCLUDING ACTIVE LOOP FILTER AND PHASE LOCKED LOOP USING THE SAME - The inventive concept relates to a supply regulated voltage controlled oscillator having a function of an active loop filter by sharing one operational amplifier without additional use of active elements in a supply regulated voltage controlled oscillator using an operational amplifier as a supply regulator, and a phase locked loop using the same. | 03-27-2014 |
20140085012 | HIGH RESOLUTION MILLIMETER WAVE DIGITALLY CONTROLLED OSCILLATOR WITH RECONFIGURABLE DISTRIBUTED METAL CAPACITOR PASSIVE RESONATORS - A novel and useful millimeter-wave digitally controlled oscillator (DCO) that achieve a tuning range greater than 10% and fine frequency resolution less than 1 MHz. Switched metal capacitors are distributed across a passive resonator for tuning the oscillation frequency. To obtain sub-MHz frequency resolution, tuning step attenuation techniques are used that exploit an inductor and a transformer. A 60-GHz fine-resolution inductor-based DCO (L-DCO) and a 60 GHz transformer-coupled DCO (T-DCO), both fabricated in 90 nm CMOS, are disclosed. The phase noise of both DCOs is lower than −90.5 dBc/Hz at 1 MHz offset across 56 to 62 GHz frequency range. The T-DCO achieves a fine frequency tuning step of 2.5 MHz, whereas the L-DCO tuning step is over one order of magnitude finer at 160 kHz. | 03-27-2014 |
20140232473 | ADPLL - An ADPLL includes a digital controlled oscillator, a first counter counting a number of clocks from the digital controlled oscillator, a second counter to count a multiplication number representing a number of the clocks in a reference clock, a TDC detecting a delayed amount of a phase of the clocks against a phase of the reference clock, an adder adding the delayed amount to a difference between the multiplication number and the number of clocks, a slew rate setting part setting a slew rate of the clocks, an ADC receiving the clocks to which the slew rate is set, a switching part switching between an output of the adder and an output of the ADC, and a controller controlling the slew rate by shifting a phase of the clocks to set a slew rate while the ADLL is locked by utilizing the TDC. | 08-21-2014 |
20140247093 | PHASE LOCKED LOOP AND SEMICONDUCTOR DEVICE USING THE SAME - It is an object of the present invention to provide a phase locked loop in which a voltage signal input to a voltage controlled oscillator after a return from a stand-by state becomes constant in a short time and power consumption is reduced. A transistor including a semiconductor layer formed using an oxide semiconductor material is provided between an input terminal of a voltage controlled oscillator and a capacitor of a loop filter. The transistor is turned on in a normal operation state and turned off in a stand-by state. | 09-04-2014 |
20150091658 | INJECTION LOCKED OSCILLATOR - An injection locked frequency divider includes a ring oscillator, an input terminal, an output terminal and a control voltage terminal. The ring oscillator has a three-stage cascade connection of a first amplification circuit including an N-channel MOS type transistor and P-channel MOS type transistors, a second amplification circuit configured in the same manner as the first amplification circuit and a third amplification circuit configured likewise. A high frequency signal is input to a gate terminal of each P-channel MOS type transistor. A predetermined DC control voltage is supplied to a gate terminal of each P-channel MOS type transistor. | 04-02-2015 |
20160065227 | ADJUSTING THE MAGNITUDE OF A CAPACITANCE OF A DIGITALLY CONTROLLED CIRCUIT - An apparatus comprises a digitally controlled circuit having a variable capacitance and a controller configured to adjust a magnitude of the variable capacitance of the digitally controlled circuit. The digitally controlled circuit comprises a plurality of gain elements, the plurality of gain elements comprising one or more positive voltage-to-frequency gain elements and one or more negative voltage-to-frequency gain elements. The controller is configured to adjust the magnitude of the capacitance by adjusting the gain provided by respective ones of the gain elements in an alternating sequence of the positive voltage-to-frequency gain elements and the negative voltage-to-frequency gain elements. | 03-03-2016 |
20160087641 | DIGITAL PHASE-LOCKED LOOP SUPPLY VOLTAGE CONTROL - Some embodiments include apparatuses and methods having a digitally controlled oscillator (DCO) in a digital phase-locked loop (PLL) and a control loop. The DCO can generate an output signal having a frequency based on a value of a digital information. The control loop can adjust a value of a supply voltage of the DCO based on the value the digital information. Additional apparatuses and methods are described. | 03-24-2016 |
20160099720 | Wideband Digitally Controlled Injection-Locked Oscillator - A novel and useful digitally controlled injection-locked RF oscillator with an auxiliary loop. The oscillator is injection locked to a time delayed version of its own resonating voltage (or its second harmonic) and its frequency is modulated by manipulating the phase and amplitude of injected current. The oscillator achieves a narrow modulation tuning range and fine step size of an LC tank based digitally controlled oscillator (DCO). The DCO first gets tuned to its center frequency by means of a conventional switched capacitor array. Frequency modulation is then achieved via a novel method of digitally controlling the phase and amplitude of injected current into the LC tank generated from its own resonating voltage. A very linear deviation from the center frequency is achieved with a much lower gain resulting in a very fine resolution DCO step size and high linearity without needing to resort to oversampled noise shaped dithering. | 04-07-2016 |
20160126892 | MODULATION CIRCUIT AND OPERATING METHOD THEREOF - A modulation circuit includes a phase locked loop (PLL) circuit, a scalar circuit and a sigma-delta modulator. The PLL circuit is for generating an output oscillating signal in response to a reference signal, a first control signal and a second control signal. The scalar circuit is for generating the first control signal in response to modulating data to control frequency deviation of the output oscillating signal, wherein the first control signal is in a digital form. The sigma-delta modulator is for generating the second control signal according to the modulating data to modulate a divider value of a frequency divider of the PLL circuit. | 05-05-2016 |
20190149140 | RESISTOR-CAPACITOR OSCILLATOR | 05-16-2019 |