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| Number | Title | Issue Date |
| 7430247 | Carrier frequency detection for N-ary phase modulated signal Carrier frequency detection for an N-ary modulated signal is achieved by digitizing the N-ary modulated signal, frequency shifting the digitized N-ary modulated signal to prevent aliasing, raising the frequency-shifted signal to the Nth power, transformin... | 09/30/2008 |
| 7379723 | Local oscillator and mixer for transceiver In one embodiment, a local oscillator and mixer architecture may include a frequency divider having I and Q channel master storage elements formed of devices of a first size, and I and Q channel slave storage elements formed of devices of a second size, where the se... | 05/27/2008 |
| 7366483 | System and method for RF power control The present invention provides a system and method for radio frequency (RF) power control that can adjust and transmit the RF power to the transmitting device according to the data rate under which the RF signal is going to transmit. ... | 04/29/2008 |
| 7356318 | Quadrature subharmonic mixer A quadrature subharmonic mixer comprises a polyphase filter configured to generate quadrature components of a local oscillator (LO) reference signal, a summing and scaling element configured to create additional components of the LO reference signal, and a plurality... | 04/08/2008 |
| 7340233 | Integrated circuit and methods for third sub harmonic up conversion and down conversion of signals An integrated circuit may include a receiver and/or a transmitter that performs third order sub-harmonic conversion. The integrated circuit may include a Gilbert cell active mixer with three or more serially-connected transistors in each of the mixer's four branches... | 03/04/2008 |
| 7263143 | System and method for statistically directing automatic gain control The present invention is directed to a system and method which statistically determines when regularly occurring interference events of a predictable duration will occur, for example radar pulses and dynamically adjusts an automatic gain control (AGC) for RF data tr... | 08/28/2007 |
| 7180974 | Frequency division method and device A method and device of frequency division with a division ratio: comprising: an input divider with a division ratio NPs receiving the frequency Fe at input and delivering a signal to an insertion/substitution divider, the insertion/substitution divider having an inp... | 02/20/2007 |
| 7177609 | Chopper-direct-conversion (CDC) radio architecture A chopper-direct-conversion (CDC) radio receiver includes a phase-alternating mixer receiving an antenna input signal and at least one local oscillator signal and generating a double sideband signal in a single mixing step. The phase-alternating mixer may be impleme... | 02/13/2007 |
| 7164896 | Method for driving a receiver stage and respective apparatus Whenever the oscillator frequency is a fraction or a multiple of the received frequency, another received frequency could in turn be there, which would then work as a kind of received disturbance frequency, and thus oscillator pulling occurs, which then severely imp... | 01/16/2007 |
| 7103115 | Optimum training sequences for wireless systems In various embodiments, techniques are provided to determine channel characteristics of various communication systems such as OFDM systems or systems using a plurality of transmit antennas by using various sets of training symbols that produce zero cross-correlation... | 09/05/2006 |
| 7085549 | Dynamic power sharing zero intermediate frequency (ZIF) mixer and method of forming same A zero intermediate frequency (ZIF) radio frequency (RF) digital mixer (200) includes a low noise amplifier (LNA) (203), a first RF mixer stage (205) for mixing an RF signal from the at least one LNA with a first local oscillator signal operatin... | 08/01/2006 |
| 7072634 | Method and apparatus for avoiding self-interference in a mobile network A method for reducing interference in a mobile network in which a node A is to establish a proposed wireless link with node B. The method includes: (a) determining a node E that transmits on a frequency equal to a frequency of the proposed link between node A and no... | 07/04/2006 |
| 7023937 | Receiver window design for multicarrier communication systems A receiver window design algorithm (210) is developed which minimizes the noise power of the demodulated multicarrier signal. The windows are effective on a variety of different channels and noise sources. Receiver windowing is a computationally efficient technique ... | 04/04/2006 |
| 7024171 | Fractional-N frequency synthesizer with cascaded sigma-delta converters Frequency synthesizer utilizing fractional-N synthesis includes a phase detector having an input receivable of a reference frequency, a loop filter arranged to receive the signal from the phase detector, a tunable oscillator arranged to receive a tuning signal gener... | 04/04/2006 |
| 6973304 | Multimode service radio communication method and apparatus A multimode service radio communication apparatus, that provides a hand-held or vehicle-mounted terminal with radio communication and radio broadcasting information of a radio information and communication providing system including mobile communication systems and ... | 12/06/2005 |
| 6959171 | Data transmission rate control A method includes monitoring a variable-rate data communication channel to determine its signal-to-noise ratio, and adjusting the data transmission rate of the variable rate data communication channel based on its signal-to-noise ratio. ... | 10/25/2005 |
| 6845083 | Multi-standard transmitter system and method for a wireless communication system A transmitter 108 converts a digital baseband signal input 150 for transmission by an antenna 114 to support multiple communication standards. An over-deviation phase multiplier 130 increases signal phase deviation by a factor of M. A dig... | 01/18/2005 |
| 6788922 | Radio FM receiver having a frequency 2-divider and a frequency 3-divider for alternatively dividing a VCO signal for down-converting a received radio signal A radio FM receiver is provided with a voltage-controlled oscillator which can be connected via a frequency 2-divider to a quadrature combination circuit for transforming down the frequencies of received radio signals and for supplying quadrature output signals. The... | 09/07/2004 |
| 6766178 | RF architecture for cellular multi-band telephones A multi-band RF architecture including a GSM quadrature modulator for modulating an intermediate frequency (IF) wherein the frequency of the modulated IF signal is changed such that each of the GSM, DCS 1800, and PCS 1900 bands have a respective IF. An intermediate ... | 07/20/2004 |
| 6731176 | Synthesizer with lock detector, lock algorithm, extended range VCO, and a simplified dual modulus divider The present invention provides a synthesizer having an efficient lock detect signal generator, an extended range VCO that can operate within any one of a plurality of adjacent characteristic curves defined by a plurality of adjacent regions, and a divide circuit imp... | 05/04/2004 |
| 6564045 | Broadband frequency multiplier An LO generation circuit generates an LO signal by doubling and quadrupling the frequency of a VCO signal. The frequency doubling and quadrupling provides high VCO-RF isolation as well as suppression of spurious noise signals in the LO output. The frequen... | 05/13/2003 |
| 6522868 | Method and apparatus for generating a communication band signal with reduced phase noise The present invention is directed to providing a local oscillator suitable for use in a communication system capable of providing actual wireless transmission rates on the order of 125 Mb/s, or higher, with relatively high transmission power on the order ... | 02/18/2003 |
| 6438371 | Multimode service radio communication method and apparatus A multimode service radio communication apparatus, that provides a hand-held or vehicle-mounted terminal with radio communication and radio broadcasting information of a radio information and communication providing system including mobile communication s... | 08/20/2002 |
| 6347219 | Transmission system, transmission/reception system, and local oscillator to be used in the same A method for generating a local oscillation signal comprising two separate frequency converters, of which one frequency converter includes an output unit for generating an internal output signal to be used for its frequency conversion, and the other frequ... | 02/12/2002 |
| 6035182 | Single counter dual modulus frequency division apparatus A single counter dual modulus frequency divider apparatus (400) utilizes a programmable divider (508) configured to receive an RF input signal at the divider system input (500) and a modulus control (516) produced by a programmable counter (510). The modu... | 03/07/2000 |
| 5907590 | Frequency dividing circuit, frequency dividing method and telephone terminal device incorporating the frequency dividing circuit A frequency dividing circuit, which is easy to form as an IC and which offers reduction both in size and power consumption, has a register "a" for storing the difference between the denominator and the numerator of the fractional frequency dividing ratio,... | 05/25/1999 |
| 5168215 | Instantaneous frequency measurement apparatus and method An apparatus and method for measuring the frequencies of a pair of signals simultaneously present in a composite signal, comprising the steps of includes components for squaring the composite signal, filtering the squared signal for separating a first pas... | 12/01/1992 |
| 5060309 | Infrared detector An infrared detector device comprising a light projector adapted to output double-modulated infrared pulse light by modulating the amplitude of high frequency modulated light by means of low frequency waves, and a light receiver adapted to receive the dou... | 10/22/1991 |
| 4969210 | Two-way radio having a PLL A method and arrangement for electronically bandswitching a radio (100) is described which includes at least a receiver (110, 111), a PLL (120), and a fully synchronized, programmable counter as a frequency divider (140) that is coupled between the receiv... | 11/06/1990 |
| 4953010 | FM demodulator including injection locked oscillator/divider An FM demodulator comprises an injection locked oscillator/divider for receiving an input signal to be demodulated. The injection locked oscillator/divider is coupled via a divider to a frequency discriminator, such as a quadrature demodulator, for provid... | 08/28/1990 |
| 4949396 | Divider method and apparatus with means for avoiding divide by zero errors A divider circuit arrangement in which in order to avoid dividing by zero the divisor (Vd) is modified by the addition of an extra signal (Xa) to form a modified divisor V'd =Vd +Xa and the dividend (... | 08/14/1990 |
| 4806872 | Frequency modulation receiver employing frequency divider A frequency dividing arrangement comprises an injection-locked divider arranged for receiving an incoming signal Fin and for providing a frequency divided signal Fout in response thereto, and a frequency divider coupled to the inject... | 02/21/1989 |
| 4805230 | Tuning method In a tuning apparatus of frequency synthesizer system comprising an input circuit means including a channel switch and a shift switch, a microcomputer and a phase-locked loop circuit including a programmable divider, a method for selecting one of a plural... | 02/14/1989 |
| 4737658 | Centralized control receiver Centralized control receiver for power distribution networks, includes an input section containing at least one digital filter, an evaluating device, and an output section, the digital filter having a frequency response effecting selective damping of harm... | 04/12/1988 |
| 4695940 | Dynamic frequency divider with a mixer stage and an amplifier A dynamic frequency divider including a mixer stage and a transimpedance amplifier connected to the output of the mixer stage.... | 09/22/1987 |
| 4679237 | Correction control circuit for AM stereophonic receivers A correction control circuit for use in compatible AM stereophonic receivers of the type utilizing a cosine correction signal to remove inherent distortion from the received and detected signals. During periods of weak or noisy signals or when co-channel ... | 07/07/1987 |
| 4608539 | FM detector with injection locked divider input circuit A frequency modulation detection arrangement comprises an FM detector and an injection-locked frequency divider arranged for receiving a radio signal and for providing a frequency divided radio signal in response thereto. The FM detector is coupled with t... | 08/26/1986 |
| 4250456 | Device for demodulating PSK-FM double modulated carrier signals A demodulator for PSK-FM double modulated carrier signals in which the carrier signal is 2N phase modulated by a main signal and frequency modulated by a sub-signal. A clock component is extracted from the received double-modulated carrier sign... | 02/10/1981 |
| 4238783 | Telemetry system for transmitting analog data over a telephone line An FSK receiver for a single channel analog telemetry system comprises an FSK demodulator, a frequency multiplier, and a frequency-to-voltage converter. An FSK transmitter comprises a voltage-to-frequency converter, a frequency divider, and an FSK tone ge... | 12/09/1980 |
| 4068199 | Digital phase-locked loop frequency modulator Frequency modulating apparatus employing a phase-locked loop. An analog signal is sampled periodically and each sample is converted to a digital signal by an analog-to-digital converter. A constant is added to the digital signal and the sum is employed as... | 01/10/1978 |
