99 results about "Electronic oscillator" patented technology

A sensor device for detecting the presence of a gas species in a gas environment susceptible to the presence of same. The sensor device may include a piezoelectric crystal coated with a sensor material having adsorptive affinity for the gas species, with an electric oscillator arranged for applying an oscillating electric field to the piezoelectric crystal to generate an output frequency therefrom indicative of the presence of the gas species when present in the gas environment, when the gas environment is exposed to the piezoelectric crystal. Another aspect of the invention involves a porous polymeric material that may be employed as a sensor material on a piezoelectric crystal sensor device, as well as a quartz microbalance holder that enables reactor gas monitoring. The sensor device alternatively may comprise an optical sensor arranged in a non-contaminating fashion in relation to the gas environment being monitored.

Systems and methods for controlling frequency output of an electronic oscillator to compensate for effects of a parameter experienced by the oscillator incorporate artificial neural network processing functionality for generating correction signals. A neural network processing module includes one or more neurons which receive one or more inputs corresponding to a parameter of an electronic oscillator, such as temperature. Weights are calculated and applied to inputs to the neurons of the neural network as part of a training process, wherein the weights help shape the output of the neural network processing module. The neural network may include a linear summation module configured to provide an output signal that is at least partially based on outputs of the one or more neurons.

An amplitude control device for a signal output by an oscillator includes a rectification circuit for rectifying the output signal, and a differential amplification circuit for generating a biasing current control signal for the oscillator. The biasing current control signal is based upon the output signal from the rectification circuit and a reference voltage. A dividing bridge and an adder are designed so that only a fraction of the reference voltage is used to define the amplitude of the oscillations. The contribution made to the oscillator phase noise by the reference voltage noise is considerably reduced.

An integrated circuit frequency generator is disclosed. In some embodiments, the frequency generator comprises an electronic oscillator configured to generate an oscillator frequency and calibration circuitry configured to periodically calibrate the electronic oscillator with respect to a reference frequency source. When a primary power source is unavailable, an output frequency is generated from the oscillator frequency, and the reference frequency source is periodically pulse powered-on to calibrate the electronic oscillator.

A novel sensing device for measuring volume, position or mass of matter (11) comprising of a housing (12) having a removable top (13), a permanent bottom (14), an electronic oscillator board (15) having plurality of electronic components for measuring volume, position, or mass of matter. A coax type wire (16) having a first end (17) connected to said electronic oscillator board (15) and a second end (18) terminating at the bottom of receiver hole (20). A retainer (19) used to form said receiver hole (20) having a top end (21) open to said permanent bottom (14) on said housing (12) to accommodate said coax type wire (16). Said receiver hole 20 having a bottom end (22) having a solid area between said bottom end (22) and lower end (25) of said non-conductive material (23). Said non-conductive material (23) having an upper end (24) being attached by mounting means (26) to said permanent bottom (14) of housing (12).

Disclosed are multiphase oscillators comprising a plurality of delay stages serially coupled in a loop by a plurality of nodes, with the loop being folded to provide two concentric rings of delay stages with equal numbers of allocated nodes. A second plurality of negative-resistance elements are provided, each element having a first output coupled to a node on the first concentric ring and a second output coupled to a node on the second concentric ring. Each such output switches between first and second voltage levels, and provides a negative resistance to a signal coupled to it during at least a portion of the transition between voltage levels. The outputs of an element switch to opposite voltage levels. With this construction, a high-voltage pulse propagates around the loop of delay stages, with a low-voltage pulse propagating behind it. Also disclosed are circuits to control the direction of pulse propagation.

Systems, methods, and apparatus are described that provide for low phase-noise, spectrally-pure, and low-jitter signals from electrical oscillators. An aspect of the present disclosure includes utilization of an open-loop feed-forward phase-noise cancellation scheme to cancel phase noise, or jitter, of an electrical oscillator. Phase noise can be measured and then subtracted, with the phase noise measurement and subtraction being performed at a speed faster than phase noise variations of the oscillator. Another aspect of the present disclosure includes use of a feedback scheme for phase noise reduction. A feedback scheme can be used alone or in conjunction with a feed-forward scheme. Related phase-noise cancellation and / or reduction methods are described. Notch filter and RF amplifier circuits are also described.

Systems and methods for controlling frequency output of an electronic oscillator to compensate for effects of one or more parameters experienced by the oscillator incorporate artificial neural network processing functionality for generating correction signals. A neural network processing module includes one or more neurons which receive one or more inputs corresponding to parameters of an electronic oscillator, such as temperature and control voltage (or correction voltage). One or more sets of weights are calculated and applied to inputs to the neurons of the neural network as part of a training process, wherein the weights help shape the output of the neural network processing module. The neural network may include a linear summation module configured to provide an output signal that is at least partially based on outputs of the one or more neurons.

Apparatus and methods for adjusting a gain of an electronic oscillator, such as a voltage-controlled oscillator (VCO), are disclosed. In one aspect, an apparatus for compensating for VCO gain variations includes a charge pump controller. The charge pump controller can be configured to select a VCO gain model based on a comparison of a VCO gain indicator and a threshold value stored in a memory, obtain VCO gain model parameters from the memory corresponding to the selected VCO gain model, and compute a charge pump current control value using the VCO gain model parameters. The charge pump current control value can be used to compensate for VCO gain variations.

Apparatus and methods for adjusting a gain of an electronic oscillator, such as a voltage-controlled oscillator (VCO), are disclosed. In one aspect, an apparatus for compensating for VCO gain variations includes a charge pump controller. The charge pump controller can be configured to select a VCO gain model based on a comparison of a VCO gain indicator and a threshold value stored in a memory, obtain VCO gain model parameters from the memory corresponding to the selected VCO gain model, and compute a charge pump current control value using the VCO gain model parameters. The charge pump current control value can be used to compensate for VCO gain variations.

Systems and methods of using an artificial neural network processing module to compensate a control voltage and create a linear output response for an electronic oscillator to produce a target frequency. The artificial neural network processing module includes one or more neurons which receive one or more inputs corresponding to the control voltage. The artificial neural network processing module is configured to provide a correction based at least in part on the control voltage and pre-calculated DAC values. The pre-calculated DAC values are determined in part by predetermined or predefined pull ranges and linear control voltage transfer functions. The artificial neural network processing module can preferably achieve a control voltage tuning linearity better than 0.5% linearity over an entire tuning range of ±−75 ppm.

Systems, methods, and apparatus are described that provide for low phase-noise, spectrally-pure, and low-jitter signals from electrical oscillators. An aspect of the present disclosure includes utilization of an open-loop feed-forward phase-noise cancellation scheme to cancel phase noise, or jitter, of an electrical oscillator. Phase noise can be measured and then subtracted, with the phase noise measurement and subtraction being performed at a speed faster than phase noise variations of the oscillator. Another aspect of the present disclosure includes use of a feedback scheme for phase noise reduction. A feedback scheme can be used alone or in conjunction with a feed-forward scheme. Related phase-noise cancellation and / or reduction methods are described. Notch filter and RF amplifier circuits are also described.

An integrated circuit frequency generator is disclosed. In some embodiments, the frequency generator comprises an electronic oscillator configured to generate an oscillator frequency and calibration circuitry configured to periodically calibrate the electronic oscillator with respect to a reference frequency source. When a primary power source is unavailable, an output frequency is generated from the oscillator frequency, and the reference frequency source is powered-on only during calibration cycles.

The invention discloses a control system for fatigue relieving pneumatic ventilation massage seats for an automobile. The control system is composed of a seat back, an air-pressure cavity, a power air tube, an upper air tube, an electronic oscillator, a main air tube, a solenoid valve a, a solenoid valve b, a lower air tube, a seat, seat air vents, back air vents and telescopic massage heads. The electronic oscillator in the seat back controls the air pressure cavity in accordance with procedures to change pressure in the air pressure cavity, so that the seat surface moves along with the air pressure cavity to massage drivers and passengers; the air flow of the seat is controlled by the solenoid valves to enable air to flow out from the chair air vents and the back air vents to achieve ventilation. By means of the control system, fatigue of users who work for a whole day or drive for a long time can be relieved by the seats with the ventilation and massage functions, overall ventilation and massage can be performed on waists and the whole backs of drivers and passengers, and accordingly, fatigue is relieved.

A phased antenna array includes a plurality of electro-optic (EO) circuits. Each EO circuit has a digital-to-analog converter (DAC) configured to receive a baseband signal, and an optical source comprising an opto-electronic oscillator configured to generate an optical signal. Each EO circuit also has an EO modulator coupled downstream of the DAC and to the optical source and configured to modulate an optical carrier signal based upon the baseband signal and the optical signal, and an optical combiner coupled downstream of the EO modulator and coupled to the optical source. In addition, there are a plurality of antenna circuits spaced apart from the plurality of EO circuits, each antenna circuit comprising at least one photodiode and an antenna element coupled thereto. Moreover, a plurality of optical fibers couple the plurality of EO circuits to the plurality of antenna circuits.

The invention relates to a high-precision optical fiber grating sensing detection structure based on radio frequency optical modulation, which is characterized by comprising a wavelength-adjustable optical source, an optical coupler, a radio frequency optical modulator, a pulse optical modulator, a optical band pass filter, an optical amplifier, an optical circulator, an optical coupler, a photoelectric detector and an electronic processor in sequential connection, wherein the optical circulator is connected with an optical fiber. The high-precision optical fiber grating sensing detection structure has the advantages that: 1, because the radio frequency optical modulation is adopted for realizing the optical frequency shit so that the wavelength / frequency of the detected light is accurate to the level of an electronic oscillator, and the wavelength adjustable optical source can be added for expanding the wavelength / frequency moving range; 2, the optical incoherent detection can be conveniently added in the structure for improving the detection signal-to-noise ratio; and 3, the detection structure can adapt to various optical fiber grating arrays, such as optical fiber grating arrays with the characteristic that each grating in the optical fiber grating group can be low-reflectivity optical fiber grating with the same center frequency or different center frequencies.

Apparatus and methods for adjusting a gain of an electronic oscillator, such as a voltage-controlled oscillator (VCO), are disclosed. In one aspect, an apparatus for compensating for VCO gain variations includes a charge pump controller. The charge pump controller can be configured to select a VCO gain model based on a comparison of a VCO gain indicator and a threshold value stored in a memory, obtain VCO gain model parameters from the memory corresponding to the selected VCO gain model, and compute a charge pump current control value using the VCO gain model parameters. The charge pump current control value can be used to compensate for VCO gain variations.

An oscillator circuit and method for gain and phase noise control. A gain and phase noise controlled oscillator circuit includes a variable electronic oscillator and a tuning loop circuit. In operation, the variable electronic oscillator generates a clock signal and has a clock signal frequency that is controlled by a sense voltage received by the variable electronic oscillator or by one or more capacitive loads coupled to the variable electronic oscillator. Further, the tuning loop circuit is coupled to the variable electronic oscillator and compares the sense voltage to a control voltage received by the tuning loop circuit and produces one or more correction signals based on the comparison, where the one or more capacitive loads change capacitance based on the one or more correction signals.

A novel sensing device having a unique structure, for measuring volume, position or mass of matter (11) comprising of a housing (12) having a removable top (13), a permanent bottom (14), an electronic oscillator board (15) having plurality of electronic components for measuring volume, position, or mass of matter. A coax type wire (16) having a first end (17) connected to said electronic oscillator board (15) and a second end (18) terminating at the bottom of receiver hole (20). A retainer (19) used to form said receiver hole (20) having a top end (21) open to said permanent bottom (14) on said housing (12) to accommodate said coax type wire (16). Said receiver hole 20 having a bottom end (22) and lower end (25) being isolated by said non-conductive material (23). Said non-conductive material (23) having an upper end (24) being attached by mounting means (26) to said permanent bottom (14) of housing (12).

Systems and methods for controlling frequency output of an electronic oscillator to compensate for effects of a parameter experienced by the oscillator incorporate artificial neural network processing functionality for generating correction signals. A neural network processing module includes one or more neurons which receive one or more inputs corresponding to a parameter of an electronic oscillator, such as temperature. Weights are calculated and applied to inputs to the neurons of the neural network as part of a training process, wherein the weights help shape the output of the neural network processing module. The neural network may include a linear summation module configured to provide an output signal that is at least partially based on outputs of the one or more neurons.

The present disclosure provides for a system and method for compensating an electronic oscillator for one or more environmental parameters. A method may comprise segmenting test data received from an output signal of the oscillator and generating at least one correction voltage to thereby compensate the oscillator for one or more environmental parameters. A system may comprise at least one multi-function segmented array compensation module configured to receive one or more output signals from an oscillator and generate one or more correction voltages to thereby compensate the oscillator for environmental parameters. The system may also comprise one or more sensors and a user EFC.

Disclosed are multiphase oscillators comprising a plurality of delay stages serially coupled in a loop by a plurality of nodes, with the loop being folded to provide two concentric rings of delay stages with equal numbers of allocated nodes. A second plurality of negative-resistance elements are provided, each element having a first output coupled to a node on the first concentric ring and a second output coupled to a node on the second concentric ring. Each such output switches between first and second voltage levels, and provides a negative resistance to a signal coupled to it during at least a portion of the transition between voltage levels. The outputs of an element switch to opposite voltage levels. With this construction, a high-voltage pulse propagates around the loop of delay stages, with a low-voltage pulse propagating behind it. Also disclosed are circuits to control the direction of pulse propagation.

The invention provides a stability control circuit for an injection locking opto-electronic oscillator. The stability control circuit for the injection locking opto-electronic oscillator comprises a phase shifter microwave amplifier, a frequency mixer, a low-pass filter and a servo module, and is characterized in that an injection signal is divided by the stability control circuit into two parts, one part of the injection signal is injected into a long fiber loop OEO, the other part of the injection signal serves as a reference signal, 90-degree phase shifting is carried out on the reference signal, then, frequency mixing and phase demodulation are carried out on the reference signal and an OEO output signal, a voltage signal processed through phase demodulation is fed back to the voltage control end of a voltage control phase shifter in an OEO loop, the phase of an oscillation signal is controlled through phase shifting of the phase shifter until the oscillation signal and the reference signal are synchronous, and finally a stable output signal is obtained. According to the stability control circuit for the injection locking opto-electronic oscillator, long-term stability of the OEO can be kept on the situation that complex external factor interference exists; compared with a traditional OEO stability control circuit, signal processing is carried out in an electric field, complexity of an optical domain control system is overcome, and high control accuracy is achieved.

The invention discloses a multifunctional vehicle seat which comprises a backrest (1), a headrest (2) and a cushion (3). A plurality of massage balls are arranged on the backrest (1). Air pressure cavities corresponding to the massage balls are arranged inside the backrest (1). A vehicle control unit controls an electronic oscillator arranged inside the backrest to be started to work to change the air pressure of the air pressure cavities so as to push the massage balls to act. A ventilation radiating device is arranged on the cushion (3). The multifunctional vehicle seat greatly improves riding comfort and using performance and has the good application prospect.

A sensor array for measuring various parameters in a machine environment, the sensor array comprising a number of oscillators, each of the oscillators comprising a feedback network, an amplifier and a limiter being connected together in a loop. The feedback network has a frequency which varies with the parameters to be measured. The amplifier consumes a current from a current supply and in cooperation with the feedback network produces a signal that alternates at the natural frequency of the feedback network. The limiter limits the amplitude of the signal within a predetermined amplitude range. All of the signals from the oscillators are multiplexed onto the output of the sensor array. Frequency analysis may then used to isolate the individual readings from each of the oscillators.

Systems and methods of using an artificial neural network processing module to compensate a control voltage and create a linear output response for an electronic oscillator to produce a target frequency. The artificial neural network processing module includes one or more neurons which receive one or more inputs corresponding to the control voltage. The artificial neural network processing module is configured to provide a correction based at least in part on the control voltage and pre-calculated DAC values. The pre-calculated DAC values are determined in part by predetermined or predefined pull ranges and linear control voltage transfer functions. The artificial neural network processing module can preferably achieve a control voltage tuning linearity better than 0.5% linearity over an entire tuning range of +−75 ppm.

An electronic oscillator circuit has a first oscillator, for supplying a first oscillation signal, a second oscillator, for supplying a second oscillation signal, a first controller for delivering the first control signal as a function of a phase difference between a first controller input and a second controller input of the first controller; a second controller for delivering the second control signal as a function of a phase difference between a first controller input of the second controller and a second controller input of the second controller; a resonator; at least a second resonance frequency, with a first phase shift dependent on the difference between the frequency of a second exciting signal and the second resonance frequency and processing means, for receiving the first oscillator signal and the second oscillator signal, determining their mutual proportion, looking up a frequency compensation factor in a prestored table and outputting a compensated oscillation signal.

A beam of charged particles (e.g., an electron beam) from a charged particle source can be selectively applied to a pair of electrodes. For example, the charged particles can be electrons that are directed toward a first electrode when the charge difference between the electrodes is in one state and directed toward the second electrode when the charge difference between the electrodes is in another state. The electrodes are configured so that the beam of charged particles oscillates between the first and second electrodes.

A varactor folding technique reduces noise in controllable electronic oscillators through the use of a series of varactors having relatively small capacitance. A folding circuit provides control signals to the varactors in a sequential manner to provide a relatively smooth change in the total capacitance of the oscillator. Consequently, effective control of the oscillator is achieved with accompanying reductions in oscillator noise such as flicker noise.

An electronic oscillator of a circuit arrangement for creating microwave oscillations with two transistors as amplifier elements and with a resonator (4), wherein the resonator has two emitter impedance networks, the base impedance network and / or an emitter impedance network or both emitter impedance networks can be put out of tune and the transistors each have a parasitic base collector capacitance. The repercussion of the load on the electronic oscillator (“load-pulling”) is greatly reduced so as to be eliminated as much as possible, in that a compensation capacitance is switched between the collector of the first transistor and the base of the second transistor as well as between the collector of the second transistor and the base of the first transistor, and the compensation capacitances are implemented by reverse-biased pn-junctions.