| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 332149000 | AMPLITUDE MODULATOR | 25 |
| 20090128247 | INTERMITTENT OPERATION CIRCUIT AND MODULATION DEVICE - There is provided a small-size, low-power-consumption intermittent operation circuit capable of obtaining an output waveform having a rapid rise and fall. The intermittent operation circuit includes an active circuit ( | 05-21-2009 |
| 20090231053 | Modulator - A modulator includes a first converter, a second converter and a mixer. The first converter is configured to receive a first bit and provide a first current that is a function of the first bit. The second converter is configured to receive a second bit and provide a second current that is a function of the second bit. The mixer is configured to receive an input current that is a sum of the first current and the second current and a frequency signal and provide an output signal that is a function of the input current and the frequency signal. | 09-17-2009 |
| 20100109789 | Radio frequency amplifier with digital amplitude modulation and method for controlling the delivering of power - A digital amplitude modulator is configured to modulate the amplitude of an input carrier signal based on input digital data and generate a corresponding output signal. The digital amplitude modulator includes a first variable gain amplifier for receiving the input carrier signal and generating a corresponding first amplified carrier signal, a second variable gain amplifier for receiving the input digital data and generating corresponding digital amplitude control data and a plurality of selectively activatable amplifier stages. Each amplifier stage receives a replica of the first amplified carrier signal and generates a corresponding second amplified carrier signal when activated. The output signal corresponds to a combination of the second amplified carrier signals generated by the activated amplifier stages. The digital amplitude modulator further includes a driving circuit configured to receive the digital amplitude control data and activate a corresponding set of selected amplifier stages based on the digital amplitude control data, and a power controller unit configured to adjust the power delivered by the digital amplitude modulator by setting a first amplifying gain of the first variable gain amplifier and a second amplifying gain of the second variable gain amplifier. | 05-06-2010 |
| 20100134198 | METHOD FOR THE PRODUCTION OF A DIGITALLY MODULATED HIGH-FREQUENCY SIGNAL - In a method for the production of a radio-frequency signal modulated as a function of a low-frequency digital data stream, a clock signal is provided having a frequency that is at least four times as high as the frequency of the radio-frequency signal to be produced. The clock signal is used for mixing the low-frequency data stream with a cyclical numeric sequence representing a continuous sinusoidal or co-sinusoidal series. A circuit arrangement implements such a method to produce a radio-frequency signal modulated as a function of a low-frequency digital data stream, and a magnetic resonance tomography system employs such a circuit arrangement. | 06-03-2010 |
| 20100301961 | PHASE LOCKED LOOP - A phase locked loop comprising: an oscillator for generating an output signal of a frequency that is dependent on an input to the oscillator; sampling means for generating a sequence of digital values representing the output of the oscillator at moments synchronised with a reference frequency; a difference unit for generating a feedback signal representing the difference between successive values in the sequence; and an integrator for integrating the difference between the feedback signal and a signal of a desired output frequency; the signal input to the oscillator being dependent on the output of the integrator. | 12-02-2010 |
| 20100321127 | TEST APPARATUS FOR DIGITAL MODULATED SIGNAL - A test apparatus includes digital modulators provided in increments of multiple channels. A baseband signal generator performs retiming of data input as a modulation signal for the in-phase (quadrature) component, using a timing signal the timing of which can be adjusted, thereby generating a baseband signal. A driver generates a multi-value digital signal having a level that corresponds to the baseband signal output from the baseband signal generator. A multiplier amplitude-modulates a carrier signal with the multi-value digital signal. An adder sums the output signals of the multipliers. | 12-23-2010 |
| 20100327988 | REDUCING THE DISTORTION OF APPLIED MODULATION - Signal modulation apparatus for applying a modulation signal to a carrier signal, the apparatus comprising: an amplitude modulator for modulating the amplitude of the carrier signal in accordance with a control signal; first mixing means for mixing together fractions of the carrier signal before and after action of the amplitude modulator to produce a first detection signal indicative of the amplitude modulation applied by the amplitude modulator; and detection means for comparing the control signal with a first detection signal to evaluate distortion in the first detection signal as compared with the control signal. | 12-30-2010 |
| 20110074518 | QUADRATURE AMPLITUDE MODULATOR AND QUADRATURE AMPLITUDE MODULATION METHOD - A quadrature amplitude modulator is provided. An oscillator generates an in-phase carrier signal having a rectangular wave, a trapezoidal wave or a waveform similar to these, and a quadrature carrier signal, the phase of which is shifted by ¼ cycle relative to the in-phase carrier signal. A multi-level driver generates an in-phase modulated signal by amplitude modulating the in-phase carrier signal with an analog in-phase baseband signal having a discrete voltage level or current level in accordance with the in-phase baseband data. Likewise, the multi-level driver generates a quadrature modulated signal by amplitude modulating the quadrature carrier signal with an analog quadrature baseband signal having a discrete voltage level or current level in accordance with the quadrature baseband data The multi-level driver generates a modulated signal, the amplitude of which takes a discrete level, by combining the modulated signals together. | 03-31-2011 |
| 20110121911 | MODULATION CIRCUIT AND SEMICONDUCTOR DEVICE INCLUDING THE SAME - A modulation circuit includes a load and a transistor serving as a switch. The transistor has an oxide semiconductor layer in which hydrogen concentration is 5×10 | 05-26-2011 |
| 20130162363 | MODULATOR, MIXER AND METHOD FOR AMPLITUDE SHIFT KEYING MODULATION - An ASK modulator includes a baseband unit which obtains a sequence comprising at least one amplitude value and adds an additional value to each of the at least one amplitude value to generate a modified sequence; a digital-to-analog converter coupled to the baseband unit, the digital-to-analog converter converts the modified sequence to generate a first signal, the additional value is determined based on a half scale of the digital-analog converter; and a mixer which receives the first signal and a second signal and generate a modulated signal by mixing the first signal with the second signal. | 06-27-2013 |
| 20140320226 | SYNTHESIZER FOR TRANSMITTER AND DIGITAL AMPLITUDE MODULATOR - According to one embodiment, a synthesizer for a transmitter includes a transformer, a plurality of core support units and a fixing member. The plurality of core support units includes a support plate, fixing unit and an insertion. The support plate supports a toroidal core around which the primary winding is wound. The fixing unit fixes the toroidal core to the support plate. The insertion portion is formed inside or around the toroidal core and into which the secondary winding is inserted. The fixing member includes a plurality of receiving portions to and from which the plurality of core support units are attached and detached. The plurality of receiving portions are formed along a direction in which the plurality of core support units are stacked. | 10-30-2014 |
| 332151000 | Plural modulation | 3 |
| 20090021321 | HYBRID LINEAR AND POLAR MODULATION APPARATUS - The invention is directed at a hybrid modulation apparatus which combines a polar modulation circuit and a linear modulation circuit. The hybrid apparatus allows a communications device to function as a polar or a linear modulation circuit with less components as the output of the linear modulation circuit is an input of the polar modulation circuit. | 01-22-2009 |
| 20090108952 | DISTORTION COMPENSATING CIRCUIT - A distortion compensating circuit is provided in which, in the polar modulation system, while suppressing increase of compensation data and increase of the circuit scale, a modulated signal can be correctly expressed, or low-distortion characteristics of a power amplifier can be realized. Based on a steady characteristic compensating circuit | 04-30-2009 |
| 20090237171 | REDUCING CROSS MODULATION IN MULTICHANNEL MODULATED OPTICAL SYSTEMS WITH ANTI-CLIPPING - A modulated optical system with anti-clipping reduces or corrects clipping that might occur in the laser as a result of negative spikes or peaks in a multichannel RF signal. The system generally detects an envelope of the RF signal to generate an anti-clipping signal that follows at least a portion of the envelope and prevents one or more negative peaks from causing clipping by adjusting a bias current in response to the anti-clipping signal. The system may also reduce cross modulation by clamping the anti-clipping signal at an anti-clipping limit during lower power periods of the RF signal. | 09-24-2009 |
| 332155000 | Percent modulation control or automatic amplitude control of carrier or modulating signal | 1 |
| 20140375393 | DIGITAL AMPLITUDE MODULATOR AND CONTROL METHOD FOR DIGITAL AMPLITUDE MODULATOR - According to one embodiment, a digital amplitude modulator includes a power supply unit, a measurement unit, a calculation unit, and a power controller. The power supply unit supplies a power supply voltage to a plurality of power amplifiers. The measurement unit measures the output power and reflection coefficient of a synthesizer. The calculation unit calculates loss power occurring in each power amplifier in an ON state, and reflected power consumed by each power amplifier in the ON state. The power controller controls all the power amplifiers to be in an OFF state, and performs a normal operation, and controls the input voltage of the power supply unit or ON/OFF of the plurality of power amplifiers. | 12-25-2014 |
| 332170000 | Single or vestigial sideband type | 2 |
| 20090096546 | MODULATOR FOR RADIO-FREQUENCY SIGNALS - A modulator for radio-frequency signals designed an entirely digital modulator has two mixer stages connected in series. The first mixer stage implements with a relatively low first sample rate a frequency mixing with a first oscillator frequency that is adjustable with high precision. The second mixer stage implements a frequency mixing with a significantly higher second sample rate and with a relatively coarsely adjustable second oscillator frequency. The downstream second mixer stage, in the case of a single mixer stage, the mixer stage, has at least two phase accumulators that are incremented with the higher second sample rate but with different incremental values. The output signal of at maximum one of the phase accumulators is evaluated at any point in time. | 04-16-2009 |
| 20110043296 | SINGLE SIDE BAND MIXER AND LOCAL OSCILLATOR HAVING THE SAME - A single side band (SSB) mixer includes an in-phase SSB mixer unit and a quadrature-phase SSB mixer unit. The in-phase SSB mixer unit generates an in-phase output current, and includes a first transformer load in which a portion of a quadrature-phase output current flows. The quadrature-phase SSB mixer unit generates the quadrature-phase output current, and includes a second transformer load in which a portion of the in-phase output current flows. The SSB mixer may be used in a wide frequency band without degrading frequency selectivity. | 02-24-2011 |
| 332174000 | Resistive or dissipative device controlled by modulating signal (e.g., loss modulator) | 1 |
| 20110102094 | METHOD AND APPARATUS FOR RESONANT FREQUENCY WAVEFORM MODULATION - A resonant modulator device and process are described that provide enhanced resonant frequency waveforms to electrical devices including, e.g., laser devices. Faster, larger, and more complex modulation waveforms are obtained than can be obtained by use of conventional current controllers alone. | 05-05-2011 |
| 332175000 | Variable reactance controlled by modulating signal | 1 |
| 20110102095 | MEMS RESONATOR FOR FILTERING AND MIXING - A method of operating a micro-electromechanical system, comprising a resonator; an actuation electrode; and a first detection electrode, to filter and mix a plurality of signals. The method comprises applying a first alternating voltage signal to the actuation electrode, wherein an actuation force is generated having a frequency bandwidth that is greater than and includes a resonant bandwidth of a mechanical frequency response of the resonator, and wherein a displacement of the resonator is produced which is filtered by the mechanical frequency response and varies a value of an electrical characteristic of the first detection electrode. The method also comprises applying a second alternating voltage signal to the first detection electrode, wherein the second voltage signal is mixed with the varying value to produce a first alternating current signal. The first alternating current signal is detected at the first detection electrode. | 05-05-2011 |
| 332176000 | Nonlinear device controlled by modulating signal | 2 |
| 332177000 | Nonlinear discrete semiconductor device | 2 |
| 20120007687 | Digital Amplitude Modulation - A transmitter using quadrature modulation includes a rectangular to polar converter for converting data symbols into a polar form, where each polar symbol has a magnitude signal and an angle signal. Digital phase modulation circuitry includes an all digital PLL circuit for generating a phase modulated RF carrier signal responsive to the angle signal frequency control word (FCW) and a carrier frequency FCW. A digitally controlled amplifier for amplifying the phase modulated signal is controlled by a digital amplitude control circuitry for controlling the gain of the digitally controlled amplifier responsive to the magnitude signal. | 01-12-2012 |
| 20150349713 | MULTI-STEP DRIVE SIGNAL FOR PIN DIODE BASED RF AMPLITUDE MODULATORS - Methods and devices are disclosed driving one or more P-Intrinsic-N (PIN) diodes by receiving an input and generating a plurality of pulses based on the input, a first pulse of the plurality of pulses controls a rise time of an RF envelope generated by an RF interface and a second pulse of the plurality of pulses controls a fall time of the RF envelope generated by the RF interface. The methods and devices may further be disclosed combining the plurality of pulses to generate a drive signal, delivering the drive signal to the RF interface including one or more PIN diodes, and generating the RF envelope by driving the one or more PIN diodes with the drive signal, and the amplitude or a pulse width of the first pulse is independently adjustable from the amplitude or the pulse width of the second pulse. | 12-03-2015 |
| 332178000 | Including discrete semiconductor device | 2 |
| 20100052806 | MODULATION FOR AMPLITUDE-MODULATING A SIGNAL - Modulators for amplitude-modulating signals defined by phase information and envelope codes are provided with first transistors for receiving the phase information and second transistors for receiving the envelope codes. The first main electrode of one transistor is coupled to the second main electrode of the other transistor and the other second main electrode constitutes an output of the modulator. This modulator can be used in any kind of transistor environment and is simple and low cost. The doped areas of the coupled first and second main electrodes comprise an overlap to reduce cross-talk and to reduce silicon area. Polar transmitters are provided with this modulator and with a circuit for generating a phase/frequency code and the envelope code and with an oscillator for receiving the phase/frequency code and for generating the phase information. A phase shift between the phase information and the envelope code reduce aliases. | 03-04-2010 |
| 20100134199 | APPARATUS AND METHOD FOR PRODUCING SIGNALS CODED WITH AMPLITUDE SHIFT KEYING - An apparatus for coding a signal by means of amplitude shift keying comprises a class E amplifier including a switching transistor, to whose gate is supplied a voltage having an operating frequency for operating the class E amplifier. For achieving an amplitude shift keying in the output signal of the class E amplifier, a circuit for switching the operating frequency of the voltage supplied to the gate of the switching transistor, or the resonance frequency of the class E amplifier, between a first value and a second value is provided and in order to switch a deviation degree between the operating frequency and the resonance frequency between a first value and a second value. | 06-03-2010 |
| 332179000 | Including electron discharge device | 2 |
| 20130342279 | METHODS AND APPARATUS FOR TERAHERTZ WAVE AMPLITUDE MODULATION - A wave amplitude modulator for modulating a transmitted electromagnetic wave includes one or multiple self-gated capacitively coupled pair(s) of electron layers such as semiconductor or semimetal layers. Two electrical contacts are placed to each layer of electrons of the self-gated pair(s), and a power source is electrically connected to them. The power source, by varying the voltage applied between layers of electrons, tunes the electron density thereof, thereby adjusting the optical conductivity thereof, and the change in the optical conductivity of the layers of electrons causes an amplitude modulation of the transmitted electromagnetic wave passing through the capacitively coupled layers of electrons. | 12-26-2013 |
| 20140104013 | BIPOLAR MICROELECTRONIC DEVICE - An apparatus, system, and method are disclosed for modulating electric current. An electron source electrode | 04-17-2014 |
