Matches 1 - 42 out of 42


Match Document Document Title
US20120071115 Method of Controlling RF Transmissions to Mitigate Interference with Critical Care Medical Equipment  
Various methods of mitigating RF inference with one or more critical care medical devices is provided, wherein a predetermined threshold energy acceleration value is associated with the one or...
US20080192861 POLAR MODULATOR WITH SIGNED AMPLITUDE REDUCING PHASE TRANSITIONS  
A polar modulator including a signal converter configured to provide a phase signal and an amplitude signal based on at least one received signal is disclosed. A digital-to-analog converter is...
US20080299919 SIGNAL ENHANCEMENT IN RF TRANSMITTERS EMPLOYING NON-LINEAR FILTERING  
A communications transmitter having a main transmit chain for main signal features and one or more auxiliary transmit chains for auxiliary signal enhancements. In one embodiment, a communications...
US20070281631 Arrangement for transmitting signals via an antenna feed line in a mobile radio subscriber station  
The invention relates to an arrangement for transmitting signals via an antenna feed line in a mobile subscriber station, particularly in a vehicle, such as, for example, a road motor vehicle,...
US20120040630 AMPLITUDE MODULATION CIRCUIT IN POLAR TRANSMITTER AND METHOD FOR CALIBRATING AMPLITUDE OFFSET IN POLAR TRANSMITTER  
An amplitude modulation circuit in a polar transmitter includes a digital-to-analog converter (DAC), a filter, a gm stage, and a calibration module. The DAC is arranged to be coupled to an...
US20060068725 Feedback control loop for amplitude modulation in a polar transmitter with a translational loop  
Amplitude modulation is provided for a polar transmitter that incorporates a translational loop. The input to the polar transmitter and translational loop may be an amplitude modulated signal. The...
US20090175380 Complex Signal Scaling for Phase and/or Amplitude Modulated Signals  
A signal scaling device (D), for a transmission path of a wireless communication equipment, comprises a processing means (PM) adapted to receive a phase and/or amplitude modulated signal (I/Q) to...
US20100248657 POWER CORRECTION MODULE FOR POWER AMPLIFIERS  
A power correction module for use with an amplifier driving a load impedance is configured to sample the supply current and to cause a change in a control voltage, which corrects the supply...
US20080122558 Surface acoustic wave device, transmitter, and transceiver  
A surface acoustic wave device comprises a surface acoustic wave element, including: a piezoelectric substrate, a first interdigital transducer unit having a first interdigital transducer and a...
US20090042520 Envelope tracking RF amplifier  
Apparatus is presented for broadcasting an RF signal. This includes an amplifier having a first input and a second input for a vacuum tube amplifier embodiment. A sampler receives a composite RF...
US20110092173 TRANSMITTING UNIT THAT REDUCES PAPR USING OUT-OF-BAND DISTORTION AND METHOD THEREFOR  
A transmitting unit (12) clips a communication signal (14) to form a threshold-responsive signal (36, 36′) which includes in-band distortion (40) and out-of-band distortion (38). A portion of the...
US20090117863 High efficiency rf transmitter system using non-linear amplifiers  
An RF transmitter with improved efficiency and good linearity decomposes an input AM signal into two signal envelopes with phased modulation at a phase angle θ. The transmitter has three principal...
US20100311329 METHOD AND SYSTEM FOR OBTAINING MAXIMUM GAIN OF A PASSIVE UPCONVERSION MIXER UTILIZED IN A TRANSMITTER  
A RF transmitter is operable to transmit a signal at a frequency specified by the Bluetooth protocol. A passive upconversion mixer, which comprises a pair of MOSFET switches, is utilized inside...
US20090181626 TRANSMITTER  
An apparatus comprising a first circuit configured to receive a signal and output a first output signal, a second circuit configured to receive the same signal and output a second output signal...
US20050197076 Radio communication device and control method of amplification circuit thereof  
In a radio communication device which generates a baseband signal based on inputted transmit data, then modulates the baseband signal to a modulating signal, amplifies the modulating signal in a...
US20100081397 TIME ALIGNMENT METHODS AND APPARATUS FOR POLAR MODULATION TRANSMITTERS  
A polar modulation transmitter includes an amplitude modulation (AM) path with an amplitude modulation to amplitude modulation (AM/AM′) correction circuit and a phase modulation (PM) path with a...
US20090111397 POLAR MODULATION TRANSMITTER WITH ENVELOPE MODULATOR PATH SWITCHING  
Methods and apparatus for controlling power in a polar modulation transmitter. An exemplary polar modulation transmitter includes a radio frequency power amplifier (RF PA), a phase path having...
US20100068998 WIRELESS INTERFACE  
In one embodiment of the present invention, a wireless interface is provided for supplying all signals and power exclusively wirelessly from a transmitting section to a receiving section. The...
US20100151802 AMPLITUDE MODULATION CIRCUIT IN POLAR TRANSMITTER AND METHOD FOR CALIBRATING AMPLITUDE OFFSET IN POLAR TRANSMITTER  
An amplitude modulation circuit in a polar transmitter and a method for calibrating amplitude offset in the polar transmitter are provided. The amplitude modulation circuit includes a...
US20100124889 ADAPTIVE DELAY ALIGNMENT IN POLAR TRANSMITTERS  
A polar transmitter includes a power amplifier (PA), an amplitude modulation (AM) path including an AM path adjustable delay, an AM path delay measurement circuit, a phase modulation (PM) path...
US20080026706 Polar Modulating Circuit, Polar Coordinate Modulating Method, Integrated Circuit and Radio Transmission Device  
This invention intends to provide a polar modulating circuit, a polar modulating method, an integrated circuit and a radio transmission device capable of compensating for a delay difference...
US20080188189 POLAR MODULATION TRANSMISSION APPARATUS AND TRANSMISSION POWER CONTROL METHOD  
As explained above, according to embodiments of the present invention, by providing averaging section 111 that detects an average power value of amplitude component signals, and controlling...
US20130252564 POWER CONTROL TECHNIQUES FOR WIRELESS TRANSMITTERS  
Various embodiments are disclosed relating to power control techniques for wireless transmitters. In an example embodiment, an apparatus is provided that may include a digital-to-analog converter...
US20090111396 AM TRANSMITTER AND MODULATION METHOD USING SAME  
An AM (Amplitude-Modulated) transmitter capable of improving modulation distortion is provided. An adder adds a modulation signal to a pre-set power reference signal. An APC (Automatic Power...
US20100184389 WIRELESS COMMUNICATION UNIT, INTEGRATED CIRCUIT AND METHOD FOR BIASING A POWER AMPLIFIER  
A wireless communication unit (100) comprises a transmitter (120) arranged to transmit an envelope modulated signal. The transmitter (120) comprises a radio frequency power amplifier (124)...
US20100167668 METHOD AND DEVICE FOR MONITORING A RADIO-FREQUENCY TRANSMITTER DEVICE IN A MAGNETIC RESONANCE TOMOGRAPHY SYSTEM  
In a method and device for monitoring a radio-frequency transmit device of a magnetic resonance tomography system, having a transmitter antenna system that has a number of transmit channels,...
US20110244817 FORWARD LINK SIGNALING  
Exemplary embodiments are directed to forward link signaling via transmitter detuning A method may include selectively detuning a circuit to adjust an amplitude of an associated transmit signal...
US20100056080 TRANSMISSION CIRCUIT AND COMMUNICATION DEVICE  
Provided is a transmission circuit that can broaden a controlled bandwidth of a voltage controller while ensuring voltage withstanding ability of the voltage controller. The transmission circuit...
US20100297965 AMPLITUDE MODULATION CONTROLLER FOR POLAR TRANSMITTER  
Apparatus for generating a modulation signal for use in modulating the power supply of a power amplifier uses coarse and fine control for controlling the amplitude of the modulation signal, and...
US20050148308 Amplification apparatus, systems, and methods  
An apparatus and a system, as well as a method and an article, may include adjusting a duty cycle of a switching amplifier input by changing the amplitude of an analog message signal to provide a...
US20080153435 TRANSMISSION APPARATUS AND COMMUNICATION APPARATUS  
The transmission apparatus according to the present invention can reduce transmission output noise leaking into the receiving apparatus even when the transmission apparatus is applied to wireless...
US20140038534 HARMONIC SUPPRESSION IN SWITCHING AMPLIFIERS  
Configurable suppression of harmonics in a radio frequency (RF) transmitter circuit having two class-D switching amplifiers that produce a differential output signal having introduced harmonics is...
US20110280340 Frequency Synthesis  
An apparatus including a spin torque oscillator configured to receive an input electric current and to produce a radio frequency output signal; and a tunable current source for providing an input...
US20140106681 Ku ADAPTATION FOR PHASE-LOCKED LOOP WITH TWO-POINT MODULATION  
A wireless device includes: an antenna; and a polar-modulation transmitter coupled to the antenna and configured for two-point modulation, the transmitter including: a data input; a first signal...
US20090258611 POLAR MODULATION TRANSMISSION APPARATUS AND POLAR MODULATION TRANSMISSION METHOD  
The polar modulation apparatus of the present invention can control the output power of a transmission signal over a wide range and compensate characteristic degradation reliably upon temperature...
US20100003933 SIGNAL TRANSMISSION APPARATUS AND SIGNAL TRANSMISSION METHOD  
A signal transmission apparatus of the invention comprises: a correlator 12 for shaping a spectrum of a signal; and a precoder 12 disposed on a previous stage of the correlator and including an...
US20100184390 METHOD AND SYSTEM FOR EXTENDING DYNAMIC RANGE OF AN RF SIGNAL  
Aspects of a method and system for extending dynamic range of an RF signal are provided. In this regard, an amplitude signal that is representative of an amplitude of a pair of baseband signals...
US20120106403 TRANSMISSION CIRCUIT  
A transmission circuit according to the present invention includes: an amplitude signal driving section (220) that generates a control voltage based on an amplitude signal in a high-output mode,...
US20100136931 METHOD FOR TRANSMITTING AND RECEIVING ADDITIONAL CONTROL SIGNALS  
A method for transmitting/receiving an additional control signal without any loss of bandwidth and power in an original Tx signal is disclosed. If the additional control signal is transmitted via...
US20160269218 TRANSMISSION METHOD COMPATIBLE WITH HIGHER ORDER MODULATION AND LOWER ORDER MODULATION, AND APPARATUS  
Disclosed is a transmission method compatible with higher order modulation and lower order modulation, and an apparatus. A base station stores a first higher order modulation mapping table...
US20160261293 RADIO FREQUENCY SYSTEM HYBRID POWER AMPLIFIER SYSTEMS AND METHODS  
Systems and method for improving operation of a radio frequency system are provided. One embodiment provides a radio frequency system that includes a first amplifier unit with a first logic gate,...
US20150318943 TRANSMITTER AND MONITORING SYSTEM USING THE SAME  
The present disclosure discloses a transmitter and a monitoring system using this transmitter, the transmitter includes: a multi-to-one multiplexing switch configured to receive a plurality of...

Matches 1 - 42 out of 42