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Document Title |
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7576623 |
Amplitude modulation driver
A circuit includes a first semiconductor device and a second semiconductor device. The first semiconductor device has a first source region, a first gate region, and a first drain region. The first...
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7570711 |
Quadrature LINC transmission method and apparatus
A quadrature LINC transmission system processes a baseband input signal for transmission as a linearly amplified RF signal. An in-phase LINC element processes an in-phase baseband signal into an...
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7558334 |
Enhanced hybrid class-S modulator
A hybrid modulator apparatus includes a modulator that amplitude modulates a power supply signal. A correction circuit coupled in parallel with the modulator reduces errors caused by the modulator....
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7538631 |
Multi-mode amplitude modulator control method
A power management device providing a power amplifier with power supply voltage is provided. The power management unit includes a parallel-hybrid amplitude modulator apparatus having a linear part...
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7356315 |
Outphasing modulators and methods of outphasing modulation
In one exemplary embodiment of the invention, an outphasing modulator may include at least a multiplier to multiply an amplitude modulation signal by a phase modulated carrier signal to generate a...
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7327184 |
Low-power multi-level pulse amplitude modulation driver and semiconductor device having the driver
A low-power multi-level pulse amplitude modulation (PAM) driver, and a semiconductor device having the same, in which the multi (M)-level PAM driver includes a load unit, first and second current...
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7289005 |
Polar modulator and a method for modulation of a signal
A polar modulator contains a phase locked loop which is designed to emit a radio-frequency signal at one frequency to one output, with the frequency being derived from the reference signal and from...
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7274266 |
Radio frequency excitation arrangement
A method is performed for influencing the signal shape of an output signal of an RF power resonance amplifier and an RF excitation arrangement including an RF power resonance amplifier. A basic...
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7248639 |
Method for reducing the out-of-band emission in AM transmitters for digital transmission
A method for reducing out-of-band emission in an AM transmitter for digital transmission includes generating, from a digital modulation signal, an amplitude signal and a phase-modulated radio...
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7164328 |
Direct digital amplitude modulator
Various embodiments of a direct digital amplitude modulator (DDAM) for modulating radio frequency (RF) or intermediate frequency (IF) or baseband signal with the invented interpolation technique...
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7119629 |
Synchronized controlled oscillation modulator
A synchronized controlled oscillation modulator (SCOM), comprising at least one, Controlled Oscillation Modulator ( 5 ), and synchronizing means ( 1, 6 ) connected to said COM modulator. The...
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7023292 |
Polar modulation using amplitude modulated quadrature signals
Polar modulators include a phase splitter, a controller, variable current sources, transistor circuits, and a combiner. The phase splitter splits a RF carrier signal into quadrature component...
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7016432 |
Contactless IC card system
In a contactless IC card system, a modulating circuit manufactured in an IC form is operable at a high power efficiency. The demodulating apparatus is configured to include: first signal output...
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7016659 |
Amplitude modulation with time- and spectrum-shared sidebands
In an AM system directed to commercial broadcasting, a pure unmodulated (CW) carrier signal and two sideband signals are generated and processed separately as three independent signals that are...
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7009601 |
System and method for test data reporting using a status signal
In-flight entertainment systems provide entertainment for passengers on commercial airline flights. Presently, usually on longer flights, video entertainment is commonly available on in-flight...
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7003048 |
Communication arrangement comprising powerful integrated amplitude-modulation means
In a communication arrangement ( 1 ) provided for transmitting data (DA) to a transponder ( 2 ) which arrangement includes a data source ( 5 ) for delivering data (DA) and includes a carrier signal...
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6987434 |
Non-radiative dielectric waveguide modulator having waveguide type hybrid coupler
A non-radiative dielectric (NRD) waveguide modulator is provided having a waveguide type hybrid coupler, in which by forming a waveguide type 180° hybrid coupler and waveguide as a single body,...
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6952456 |
Ultra wide band transmitter
A transmitter system is provided. In one embodiment, the transmitter system includes a data modulation unit, which generates a stream of data that is synchronized with a master clock. The...
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6937108 |
Methods and apparatus for offset chirp modulation
A method and apparatus for producing a modulation scheme usable in conjunction with information transmission and reception via waveforms, such as electromagnetic waves. The modulation scheme is...
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6922114 |
Operating method and system for the resonant operation of high-pressure lamps in longitudinal mode
The operating method is based on the simultaneous application of FM and AM, and is distinguished by passing through three operating states, specifically a warm-up phase, an impressing phase and the...
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6822523 |
Power modulator and method of operating a power modulator
To address the need for a power modulator that can efficiently operate within a wideband, high-speed communication system, a method and apparatus for power modulation is provided herein. In...
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6792050 |
Ask modulation apparatus and method
A base band signal is frequency limited by a band limiting circuit 1 . The waveform of this output signal rises and falls smoothly against a time axis. A driving circuit 2 functions as a buffer...
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6768391 |
Class-B biased gilbert cells and quadrature modulators
Quadrature modulators include a quadrature splitter and a pair of Gilbert Multiplier Cells coupled to the quadrature splitter, each of which is biased in Class-B. The quiescent current bias in the...
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6738432 |
System and method for RF signal amplification
A branched power amplifier circuit includes two or more amplifier segments or branches, each with a corresponding lossy modulator. The branched power amplifier may be dynamically resized by...
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6674335 |
Blind linearization using cross-modulation
An amplitude modulated source signal ( 102 ) is received, where this signal has a source frequency bandwidth and a source envelope. A dummy envelope is computed that would yield a constant if the...
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6667668 |
System and method for controlling the frequency output from an oscillator using an in-phase voltage
A circuit, method, and network are disclosed herein to implement a voltage-controlled LC oscillator. The oscillator is configured having an LC tank circuit which is modulated by an in-phase...
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6583679 |
High-efficiency high-power amplifier
An inexpensive method and means for generating high power envelope-modulated radio frequency signals is disclosed. Embodiments provide EER amplification and separate modulation of information...
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6529562 |
Ask Modulator
An ASK modulator which modulates an input signal in accordance with a logic level of the input signal, changes the amplitude of the input signal, and generates an amplitude shift keying (ASK)...
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6504880 |
ASK modulation circuit
An Amplitude Shift Keying (ASK) modulating circuit includes an oscillation circuit generating a pulse oscillation having a given frequency. A frequency divider is provided having a binary counter...
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6400777 |
Linear modulator
Systems and methods for enhancing the linearity of a modulator by filtering a set of frequency components from the modulator output to develop a modulator feedback signal. In a preferred embodiment...
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6362702 |
Controlled self-oscillation modulator and power conversion system using such a modulator
A controlled oscillation modulator includes a comparator and a power amplification stage for pulse modulation, and a higher order oscillating loop comprising first feedback means ( 21 ) and first...
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6359506 |
Linear modulation using a linear and a non-linear amplifier
A power amplifier uses a modulation technique that varies amplitude of a drive signal and, optionally, phase angle of the drive signal. The power amplifier comprises two coupled amplifiers, a first...
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6345203 |
System and method for powering, controlling, and communicating with multiple inductively-powered devices
Magnetic Vector Steering (MVS) and Half-Cycle Amplitude Modulation (HCAM) are novel techniques which enhance the powering and control of multiple arbitrarily oriented implant devices. Together,...
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6292067 |
Ask modulator and communication device using the same
An ASK modulator can be operated with only a positive-voltage power source. A source-voltage switching circuit that applies a positive voltage to the source of a FET when a data signal is at an L...
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6256482 |
Power- conserving drive-modulation method for envelope-elimination-and-restoration (EER) transmitters
A method and a circuit for high-efficiency linear RF-power amplification over a wide range of amplitudes from zero to peak output includes a final RF-power amplifier operating at or near...
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6236284 |
RF power amplifier system having distributed modulation encoding
An RF power amplifier system is presented herein. It includes a plurality of RF power amplifier modules. At least two encoders are provided. Each encoder is associated with and controls the...
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6087904 |
Amplitude modulation and amplitude shift keying circuit
The present invention provides a modulation circuit that has excellent modulation characteristics and can be designed as an MMIC. Consequently, this modulation circuit is such that the modulating...
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5903188 |
Modulator having improved discharging unwanted capacitance
A pulse step modulator comprising is disclosed including a plurality of series connected unit step modules, each including a DC voltage source and an associated actuatable switch for, when on,...
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5859876 |
Method and apparatus for improving AM compatible digital broadcast analog fidelity
A digital signal transmission system is provided which minimizes the AM signal envelope distortion caused by multiple digitally modulated carriers in the same band as the AM signal. The system...
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5798674 |
Band Limited AM modulator using linear power amplification
A band limited Amplitude Shift Keyed (ASK) modulator employing linear modulation and an efficient Class C power amplifier. Band-limited operation is provided by filtering a digital baseband input...
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5783974 |
Digital interpolation up sampling circuit and digital modulator using same
Methods and apparatus for converting a relatively low frequency signal, e.g., a 1.5 MHz signal, to a high frequency signal, e.g., a 30-100 MHz signal, in the digital domain. An interpolation...
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5714917 |
Device incorporating a tunable thin film bulk acoustic resonator for performing amplitude and phase modulation
A method for amplitude modulating signals, and a circuit that operates in accordance with the method. The method includes a first step of applying a modulating low frequency signal having a...
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5694094 |
Narrow band arbitrary HF modulation and noise generator
A high frequency arbitrarily modulated signal and noise generator utilizes digital numerically controlled oscillators providing interbusiness directly to an adder and which are phase modulated. The...
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5661442 |
Amplitude control system having parallel integrating signal paths
An amplitude control system uses a pair of parallel integrators to rapidly adjust the amplitude of a test signal between two precisely determined power levels in an RF signal generator. The...
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5578971 |
Amplitude modulation circuit and method
An amplitude modulation circuit and method. A predetermined number of (e.g., 6) drivers and differentially switched power amplifiers are provided in pairs. A program sound signal which has been...
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5534828 |
Digitized quadrature modulator
A digitized quadrature modulator receives an I-channel input digital signal and Q-channel input digital signal, and quadrature modulater the I-channel and Q-channel input digital signals by digital...
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5469127 |
Amplification apparatus and method including modulator component
The present invention provides a system and method in which an arbitrary information-modulated signal is efficiently amplified to high power levels. The arbitrary information-modulated signal is...
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5459749 |
Multi-level superposed amplitude-modulated baseband signal processor
A multi-level superposed amplitude-modulated baseband signal processor which has simple hardware structure and a filtering effect for bandwidth and power efficiency in a digital transmission system...
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5450444 |
Digital AM transmitter
A digital AM transmitter according to the invention converts a audio signal to a digital audio signal of a plurality of bits by an A/D converter, outputs a logical code signal of "1" from each of...
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5434546 |
Circuit for simultaneous amplitude modulation of a number of signals
A method for simultaneously imposing a single modulating signal on a number of constant frequency carriers includes applying the single modulating signal and all of the carriers to a...
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