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7587179 |
Direct synthesis transmitter
A direct synthesis transmitter. A very efficient and highly linear direct synthesis transmitter is provided that can be used to directly synthesize and transmit any type of modulated signal. The...
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7450902 |
Continuous phase frequency shift keying modulation during wireless transmissions in a closed system while minimizing power consumption
Continuous phase frequency shift keying modulation is employed during wireless transmission from an internal device to an external device to increase robustness of transmissions. The continuous...
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7447483 |
Radio apparatus and a method for reducing interference in a radio apparatus
The invention relates to a method and an arrangement for reducing interference in a radio apparatus. The solution comprises a clock signal generator, an analog part and a controller arranged to...
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7409189 |
Calibration and testing architecture for receivers
A method and apparatus are provided to generate calibration signals to multiple stages in a receiver channel. The multiple stages are calibrated using multiple calibration circuits, where a...
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7394880 |
Method and apparatus for simulating radio channel
A radio channel simulator configured to read radio channel data describing a radio channel and user data including at least one user signal, and to simulate the radio channel using a FIR filter...
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7378918 |
Two-point modulation type phase modulation apparatus, polar modulation transmission apparatus, wireless transmission apparatus and wireless communication apparatus
There provides a two-point modulation phase modulation apparatus capable of obtaining an RF phase modulation signal of superior modulation precision with low power consumption and a simple...
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7363013 |
Phase lock loop applying in wireless communication system and method thereof
A phase lock loop receives a baseband signal which has an input frequency, and modulating the baseband signal to be a corresponding RF signal which has a predetermined transmission frequency for...
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7324795 |
Method of controlling phase locked loop in mobile station, and mobile station
A method of controlling a phase locked loop in a mobile station and a mobile station of a cellular telecommunications system are provided. The mobile station comprises an integrated phase locked...
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7302235 |
Synchroniser
A synchroniser for use in a receiver which receives signals, wherein the synchronizer provides a digital control signal, the control signal defining a plurality of different levels; controls the...
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7295819 |
Signal sample acquisition techniques
A sample acquisition apparatus for sampling first and second signals within a signal processing arrangement, includes a sampler for capturing sections of the waveforms of both the first and second...
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7184720 |
Method and device for simulating radio channel
The invention relates to a method and device for performing channel simulation, the device comprising a set of channel simulation units ( 200 to 214 ) for simulating a radio channel, each unit...
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7181187 |
RF transmitter having improved out of band attenuation
A radio frequency transmitter includes a digital baseband and coding module, an inverse fast Fourier transform (IFFT) module, a complex digital filter, a complex digital-to-analog converter and a...
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7177361 |
Modulator for electromagnetic signals transmitted by a contactless transmission/reception system
A data transmission device using electromagnetic wave radiation in a contactless transceiver system toward a contactless object, the data bits transmitted corresponding to the half cycle of an...
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7174139 |
Delay control in a digital radio transmitter system
A relative delay between analog R.F. output signals of a plurality of digital radio transmitters in a digital radio transmitter system is controlled. At least one interface receives delay...
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7123666 |
Gaussian minimum shift key transmitter with feedforward phase compensation
A method and apparatus for generating a burst FSK signal having precisely shaped transitions between modulation states. The apparatus uses feedforward compensation of phase gain and phase...
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7123665 |
Method and apparatus for measuring phase error of a modulated signal
A method and apparatus for generating a burst FSK signal having precisely shaped transitions between modulation states. The apparatus uses feedforward compensation of phase gain and phase...
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7123890 |
Signal sample acquisition techniques
A sample acquisition apparatus for sampling first and second signals within a signal processing arrangement, includes a sampler for capturing sections of the waveforms of both the first and second...
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7120390 |
BLUETOOTH smart offset compensation
An offset history table is implemented and maintained in a BLUETOOTH device and is used to pre-seed an expected frequency offset of a received signal from another BLUETOOTH device. The disclosed...
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7054606 |
Digitally calibrated narrowband filter with analog channel compensation
An apparatus comprising a first circuit, a second circuit and a third circuit. The first circuit may be configured to filter an analog input signal in an analog domain in response to one or more...
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7031672 |
Direct conversion transmitter system and method with quadrature balancing and low LO feed through
A system and method are provided for communicating a radio frequency (RF) signal. In use, a baseband signal is mixed with a plurality of oscillator signals with different phases in an interleaving...
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7003270 |
Electronic apparatus having radio transmitter
An electronic apparatus comprising a radio transmitter is disclosed. In a computer system ( 1 ) having a radio transmission circuit ( 3 ) of a phase modulation type supplied with power from a power...
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7003273 |
Temperature compensating circuit, electronic apparatus and radio unit having temperature compensating function
A temperature compensating circuit is provided in a radio unit, an ambient temperature is detected by a temperature sensor of the temperature compensating circuit, the detected temperature value is...
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6985703 |
Direct synthesis transmitter
A direct synthesis transmitter. A very efficient and highly linear direct synthesis transmitter is provided that can be used to directly synthesize and transmit any type of modulated signal. The...
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6983131 |
Circuit configuration for direct modulation
A circuit configuration for direction modulation contains an oscillator, whose output signal is split into quadrature components for modulation with a useful signal. A frequency shifting circuit...
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6933798 |
Trimming method and trimming device for a PLL circuit for two-point modulation
In the case of a trimming method for a PLL circuit operating based on the principle of a two-point modulation, the PLL circuit is locked without any modulation being impressed and then an analog...
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6915117 |
Multistage modulation architecture and method in a radio
In a multiple stage transmitter, and analog signal is modulated and mixed to produce a radio frequency output. A separate mixing frequency signal is provided to each stage. A single frequency...
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6882851 |
Ad-hoc control protocol governing use of an unlicensed or shared radio frequency band
Systems and methods to enable different types of radio communication devices to communicate using a common language in order to enable the devices to regulate their use of the spectrum. Each device...
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6873831 |
Method and apparatus for transmit power modulation in a wireless communications system
An apparatus according to one embodiment of the invention includes a transmitter. The transmitter receives an RF signal and produces at least two modulated signals based on the RF signal. Each of...
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6868135 |
Method and apparatus for correcting for a phase shift between a transmitter and a receiver
A method and apparatus for correcting for a phase shift between a transmitter and receiver comprising the steps of:
a) transmitting a signal from a transmitter ( 14 ); b) receiving the...
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6865399 |
Mobile telephone apparatus
In a mobile telephone apparatus corresponding to dual-band provided with an RF power module to operate in two kinds of different frequencies, a common harmonics control circuit is provided to the...
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6856791 |
Direct automatic frequency control method and apparatus
An Automatic Frequency Control (AFC) circuit for a mobile terminal employs a fractional-N Phase Locked Loop (PLL) to directly reduce errors in the synthesized frequency, such as due to component...
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6839548 |
Radio transmitter
A radio communication device modulates a received audio signal with an intermediate frequency (IF) signal before mixing with the radio frequency (RF) waveform for transmission by an antenna. A...
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6834187 |
Method of devising a frequency plan for a signal analysis circuit
A frequency plan for a signal analysis circuit includes operational parameters that are selected on the basis of first intermediate frequency (IF) filtering characteristics that are uniquely...
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6829469 |
Method and a device for producing a signal
A method for producing an output signal ( 42 ) with a specific frequency from an input signal ( 40 ) received, the frequency of which changes quickly in steps of the size of an input frequency...
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6760571 |
Automatic frequency deviation detection and correction apparatus
An RF carrier signal is frequency modulated by a modulating signal, as a function of the amplitude of the modulating signal. The number of cycles in the frequency modulated carrier is counted in a...
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6754474 |
Radio transmission system
In a transmission system, a modulator and a fractional frequency divider are introduced into the control loop of a voltage-controlled oscillator. It is shown that the benefit of this is a reduction...
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6748203 |
Three port structure with modulated LO signal
A three port structure for the down conversion demodulation of a digitally modulated RF signal is proposed, wherein no RF switches are provided. The three port structure ( 1 ) has a first input ( 2...
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6671500 |
Frequency plan
A system is disclosed for transmitting and receiving signals. The system includes the use of a frequency plan table a system for creating the frequency plan table. The frequency plan table relates...
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6549078 |
Method and system for directly modulating a voltage controlled oscillator for use in frequency/phase modulated systems
A method for generating a plurality of frequencies having predetermined frequency deviations from a phase lock loop device including a VCO having a main voltage input, a modulation voltage input...
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6542722 |
Method and system for frequency up-conversion with variety of transmitter configurations
A method and system is described wherein a signal with a lower frequency is up-converted to a higher frequency. In one embodiment, the higher frequency signal is used as a stable frequency and...
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6433830 |
Off-air phase lock technique
The proposed phase lock technique uses various feedback loops to lock the frequency and phase of a CATV modulator output signal to that of an off-air signal without directly measuring the output...
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6345173 |
Frequency modulator
A frequency modulator ( 50, 150 ) for modulating a carrier signal according to a modulation data signal to provide a modulated output signal (RFout), comprises a reference signal generator ( 54,...
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6304748 |
Transmitter circuitry for a cellular phone
A cellular phone for a mobile communications system includes a dual band transmitter which operates at a first radio frequency band and a second radio frequency band. The dual band transmitter...
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6266518 |
Method and system for down-converting electromagnetic signals by sampling and integrating over apertures
Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal are described herein. Briefly stated, such methods, systems, and apparatuses operate...
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6246297 |
Phase and/or frequency modulated frequency synthesizer having two phase locked loops
This device includes a frequency synthesizer (12) comprising two phase-locked loops (L1 and L2). The one comprises a low-pass filter (68) and the other a high-pass filter (49). The loop with the...
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6211747 |
Wideband modulated fractional-N frequency synthesizer
A direct modulation multi-accumulator fractional-N frequency synthesizer 1 for generating a carrier signal 150 modulated by a modulation signal 170, 121 is disclosed. The frequency synthesizer...
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6204750 |
Interrogator for electronic identification system
Interrogator for an electronic identification system having a first oscillator arranged to vary in frequency in accordance with the frequency of a received signal, a second oscillator arranged to...
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6144846 |
Frequency translation circuit and method of translating
A frequency translation circuit (10) translates an incoming reference signal (RF IN ) to a lower frequency using a compound mixer circuit (42). The compound mixer circuit (42) has a first mixer...
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6115586 |
Multiple loop radio frequency synthesizer
A radio frequency synthesizer receives a relatively low frequency input signal and synthesizes from it a high frequency output signal whose frequency can be programmed to change in fine steps, for...
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6018275 |
Phase locked loop with down-conversion in feedback path
A transmitter and a phase locked loop (30) for a transmitter are disclosed. The phase locked loop (30) upconverts the frequency of a baseband signal to a frequency for radio transmission. As well...
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