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7302237 Wideband signal generators, measurement devices, methods of signal generation, and methods of signal analysis  
A wideband signal generator according to one embodiment of the invention includes a variable frequency source and a direct digital synthesizer. Local oscillators, signal analyzers, modulators,...
7231196 Method and apparatus for fractional-N synthesis  
A method and apparatus for fractional-N synthesis includes processing that begins by generating a 1 st feedback frequency from the output frequency based on a fixed divider value. The processing...
7215931 Method and apparatus for up-and-down-conversion of radio frequency (RF) signals  
This patent describes a method and system which overcomes the LO-leakage problem during modulation and demodulation, common to direct conversion and similar RF transmitters and receivers. This...
7194044 Up/down conversion circuitry for radio transceiver  
A multi-channel RF receiver uses an image rejection mixer (e.g. double quadrature mixer) in the IF down conversion stage for image side band rejection (whereby use of an IF narrow band filter for...
7181181 Multi-band transceiver for a wireless communication system  
A local oscillation signal generator and a multi-band transceiver including the local oscillation signal generator are provided. The multi-band transceiver includes a fractional-N phased locked...
7158760 Frequency synthesizer with selectable preconfigured synthesizer characteristics  
A system and method are disclosed for configuring a frequency synthesizer in a transceiver. Configuring a frequency synthesizer in a transceiver includes specifying a selection bit sequence wherein...
7149485 Method and device for processing mismatches between two quadrature paths of a chain of a reception adapted for example to the reception of a signal modulated according to a modulation of the OFDM type  
In a calibration phase for a tuner of the DZIF type, N calibration frequency signals are generated at an input of a filter. The N calibration frequency signals have N calibration frequencies...
7127225 Accumulator controlled prescaler in a phased locked loop  
A wireless local area network transceiver, an integrated circuit chip, a PLL (Phase Locked Loop) device and a method are provided that may reduce influences of switching noise. The frequency of an...
7107033 Smart radio incorporating Parascan® varactors embodied within an intelligent adaptive RF front end  
A smart radio incorporating Parascan® varactors embodied within an intelligent adaptive RF front end. More specifically, this is provided for by a smart radio incorporating Parascan® varactors...
7062271 Cell selection method of mobile terminal  
A system and method for managing communications in a mobile terminal selects a serving cell of a first PLMN for the mobile terminal, monitors signal strengths of neighboring cells in at least a...
6993307 Method and apparatus for operating a PLL with a phase detector/sample hold circuit for synthesizing high-frequency signals for wireless communications  
A method and apparatus for synthesizing high-frequency signals, such as wireless communication signals, includes a phase-locked loop (PLL) frequency synthesizer with a variable capacitance voltage...
6985701 Frequency synthesizer and multi-band radio apparatus using said frequency synthesizer  
There is disclosed a frequency synthesizer having an HF synthesizer for generating a first reference frequency signal having a variable frequency in a high-frequency band as a unit synthesizer, an...
6891420 Method and apparatus for digital frequency synthesis  
A digital frequency synthesizer includes one or more reference clocks ( 104, 1316, 1502 A, 1504 A, 1506 A) optionally coupled through one or more pulse width reducers ( 106 ) to one or more main...
6850744 Method for controlling channel re-selection  
A method for re-selecting control channels in a mobile station reduces the use of resources by limiting an evaluation of candidate control channels to those channels which satisfy certain criteria...
6785525 Multiband frequency generation using a single PLL-circuit  
To minimize the overall circuitry necessary in a multiband-frequency generator, output terminals of a voltage-controlled multiband oscillator ( 22 - 1, . . . , 22 -N) are coupled to a frequency...
6754289 Synthesizer receiver  
A synthesizer receiver includes a variable bandpass filter having a variable width passband to which an intermediate frequency signal is supplied; a first detection circuit for detecting a level of...
6741846 Method and apparatus for operating a PLL with a phase detector/sample hold circuit for synthesizing high-frequency signals for wireless communications  
A method and apparatus for synthesizing high-frequency signals, such as wireless communication signals, includes a phase-locked loop (PLL) frequency synthesizer with a variable capacitance voltage...
6728521 Phase locked device with reduced electrical consumption  
The invention relates to a radio device comprising a primary oscillator, a phase locked loop driven by a signal provided by the primary oscillator and a radio emitter and/or receiver circuit...
6704552 Mobile communication apparatus with an automatic frequency controller  
A plurality of finger units despread a received signal with a first spread code to output pilot signals of a receiving channel which has been spread with the first spread code. An AFC unit...
6658240 Multiband frequency generation device and related method  
To avoid any dead time when switching between different frequency bands it is proposed to set a programmable multiband frequency synthesizer unit ( 12 ) adapted to generate an output signal in at...
6477381 Selective call receiver and method for detecting mandatory frames of a channel protocol  
A communication device ( 1 ) comprising a receiver ( 2 ) for receiving coded messages transmitted on one or more channels. There is a micro-processor ( 13 ), in communication with the receiver ( 2...
6366765 Receiver  
The present invention intends to provide a receiver which receives a signal by switching a plurality of communication systems, wherein a circuit scale is reduced to intend to the miniaturization of...
6337976 Selective-calling radio receiver using direct conversion method  
A selective-calling radio receiver using the direct conversion method is provided, which commonly uses a VCO and its neighboring component for different frequency bands. This receiver is comprised...
6137995 Circuit and method of generating a phase locked loop signal having an offset reference  
An integrated transceiver circuit (10) includes a single side-band mixer (12) and a phase locked loop (30). The phase locked loop (30) includes a phase detector (32) coupled to a voltage controlled...
6023613 Synthesizer receiver for automatically tuning master stations and associated satellite stations in specified geographical areas  
A synthesizer receiver automatically tunes to master stations and associated satellite stations in specified geographical areas by utilizing a data table having the master station data...
5991622 Method and apparatus for automatic channel measurements  
A mobile station for measuring signal strength of a set of channels includes a synthesizer, a controller and a transceiver. During an idle period, the controller loads channel data of the set of...
5877701 Radio pager reporting frequency band information  
A radio pager of the present invention includes a non-volatile memory storing frequency information for each of a plurality of frequency bands for the confirmation of a frequency band. The...
5761617 PLL synthesizer radio paging receiver capable of reducing an average power consumption  
In a radio paging receiver which is for receiving call signals and which includes a control section (5) for making each of a PLL synthesizer section (4), a frequency converter section (2), and a...
5710994 Synthesized type receiver with PLL  
A synthesizer type receiver where frequency conversion of a received signal is performed by the use of a signal formed in a PLL, and the signal frequency is changed by changing the frequency...
5710992 Chain search in a scanning receiver  
A method of searching for active signal frequencies from a plurality of frequency bands is disclosed. Bands of frequencies are defined by upper and lower limit frequencies. The bands are stored as...
5710983 Channel selecting system utilizing a random number generator having a shift register, switches and Boolean function circuit to randomly select a channel frequency  
Frequency-dividing ratio data for selecting the oscillating frequency of a synthesizer are generated by a shift register, a certain number of switches connected to respective output terminals of...
5701598 Scanning receiver with direct digital frequency synthesis and digital signal processing  
A high speed scanning radio has conventional RF amplifier, a mixer, a frequency synthesizer for the generation of local oscillator signals, an IF amplifier, a demodulator, and an audio output...
5621771 Open loop switching frequency source utilizing closed loop stabilization  
A frequency source for sequentially generating several output signals of different frequencies, which includes a permanent frequency table, a digitally stored frequency table and a single...
5577076 Scanning receiver for receiving a signal by scanning frequency of received signal  
In a scanning receiver for receiving a signal by scanning the frequency of a received signal, the speed of a scanning operation is made fast with skipping non-modulated signals and digital signals....
5574995 Radio receiver with a high speed and accurate search operation and method thereof  
A controller shifts the frequency of the local oscillator with a frequency shift circuit so that as many channels to be scanned as possible will be included within specified bandwidths, detects a...
5471661 Ultra high speed scan system  
A high speed scanning radio has conventional RF amplifier, a mixer, a frequency synthesizer for the generation of local oscillator signals, an IF amplifier, a demodulator, and an audio output...
5446767 Frequency synthesizer  
A frequency synthesizer which comprises a voltage controlled oscillator; a unit for outputting a value corresponding to a differential phase of a reference signal at a predetermined frequency as a...
5438688 Channel selecting method and highspeed scanning radio receiver which concurrently scans multiple channels  
In a radio receiver for electronically selecting channels by way of the frequency synthesizer system, a highspeed channel scanning operation is realized. A CPU (central processing unit) detects...
5428826 High-speed scanning radio receiver  
An automatic tuning system in a high-speed scanning radio receiver provided with (a) a noise squelch circuit, first and second detecting circuits, first and second control circuits, a CPU circuit...
5420646 Bandswitched tuning system having a plurality of local oscillators for a digital television receiver  
A double conversion type television tuning system for a digital television signal includes a synthesizer for developing a tuning voltage for the upconverter. The synthesizer provides bandswitching...
5355527 Radio receiver with display memory and keys for displaying selecting, and storing station frequencies  
A radio receiver of a synthesizer type having a PLL adapted to make frequency conversion of a received signal using an oscillated signal by the PLL to thereby achieve channel selection select keys,...
5257409 Frequency synthesizer with programming feedback  
This disclosure discusses a programmable frequency synthesizer arrangement having programming feedback capability used to avoid undesirable operation due to random hard and soft faults. The...
5212817 Ultra high speed scan system  
A high speed scanning radio has conventional RF amplifier, a mixer, a frequency synthesizer for the generation of local oscillator signals, an IF amplifier, a demodulator, and an audio output...
5199109 Multi channel scanning receiver with improved signal strength detecting circuitry  
A scanning radio is provided having a plurality of the following elements: 1. a circuit to develop an output representative of the noise power contained in a demodulated signal at a present time;...
5197093 Enviromental adaptive mechanism for channel utilization in cordless telephones  
A cordless telephone has an improved mechanism for scanning and selecting channels by adapting to the channel usage patterns of the local environment in which it is placed. This results in a...
5179729 Tuner station selecting apparatus  
A tuner station apparatus includes a first mixer for combining an input signal and a first local oscillation signal, and a second mixer for combining an output of the first mixer and a second local...
5163161 Fast scanning radio receiver with frequency data base management by remote processor  
A scanning receiver includes an Electrically Erasable Programmable Read Only Memory (EEPROM) as massive nonvolatile storage for frequency control words. The receiver includes a microprocessor based...
5152005 High resolution frequency synthesis  
The synthesizer includes an output PLL having a divide-by-N1 divider in its feedback loop. The output PLL is couples through frequency offset circuitry to receive a reference signal from a driver...
5121408 Synchronization for entry to a network in a frequency hopping communication system  
Synchronization of a frequency hopping transceiver to a network by embedding synchronization codes in the pseudo-random frequency hopping transmission sequence. A receiver is implemented with a...
5023938 Station selecting device in tuner for automatic selection according to input information  
A tuner having a programmable frequency divider which selects a broadcast station in accordance with a frequency division number, and a broadcast station selecting device. The selecting device...
Matches 1 - 50 out of 139 1 2 3 >