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| Number | Title | Issue Date |
| 7737800 | Frequency modulation circuit Provided is a frequency modulation circuit 1 for outputting a highly precise frequency-modulated signal regardless of variation in a characteristic of a VCO 15. A correction value calculation section 17 calculates a correction value Vt2 | 06/15/2010 |
| 7557671 | Real time VCO gain non linearity calibration A method of determining a gain nonlinearity receives a phase difference and generates an output frequency based on the received phase difference. The method reconstructs a waveform by using the output frequency. The method preprocesses the phase difference to genera... | 07/07/2009 |
| 7418058 | Distortion compensating apparatus and method The present apparatus includes: distortion amount detector which detects the amount of distortion of an output signal of the amplifier; parameter holder; parameter corrector which corrects a parameter held in the parameter holder in such a manner that the distortion... | 08/26/2008 |
| 7353011 | Method and apparatus for operating a PLL 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 controlled oscillator (VCO) that has a discretely variable capacitanc... | 04/01/2008 |
| 7343139 | Device for converting frequencies, method of calibrating said device and system for transmitting/receiving electromagnetic signals comprising such a device The invention relates to a device for converting frequencies comprising a local oscillator of fixed frequency and a first mixer with two inputs and an output, a first input receiving the signal to be converted and a second input receiving the signal arising from the... | 03/11/2008 |
| 7321272 | Device for detecting the temperature of an oscillator crystal In a device for detecting the temperature of an oscillator crystal 2, arranged on a carrier, in particular in a mobile radio apparatus, the detected temperature should be as exact as possible a replica of the temperature to which the oscillator crystal 2 | 01/22/2008 |
| 7292118 | Modulator A modulator according to the invention includes: a PLL circuit that detects a phase difference between an input signal and a reference signal, an AGC circuit that controls a gain of a modulating signal and outputs a control signal, and a voltage controlled oscillati... | 11/06/2007 |
| 7230981 | Integrated data jitter generator for the testing of high-speed serial interfaces An integrated data jitter generator for the testing of high speed serial interfaces is provided. A transmit timing generator for use in a transmit data path includes a high frequency clock generator such as a phase-locked loop or a delay-locked loop having an input ... | 06/12/2007 |
| 7158443 | Delay-lock loop and method adapting itself to operate over a wide frequency range A delay-lock loop receives an input clock signal from the output of a programmable divider that receives a reference clock signal. The delay-lock loop includes a voltage-controlled delay line generating a plurality of delayed clock signals having different phases. A... | 01/02/2007 |
| 7155176 | System for synchronizing a portable transceiver to a network A system for synchronizing a portable transceiver to a network is disclosed. Embodiments of the system for synchronizing a portable transceiver to a network include a crystal oscillator, a frequency synthesizer adapted to receive an output of the crystal oscillator,... | 12/26/2006 |
| 7136626 | Radio frequency modulator A transmitter architecture (200) provides for a stable and low noise modulator where the modulation bandwidth is uncorrelated to the TX loop bandwidth. The output signal (228) of the TX loop is demodulated by a demodulator (208) and the demodula... | 11/14/2006 |
| 7116183 | Temperature compensated voltage controlled oscillator A VCO with temperature compensation is achieved using reverse biased diodes. The VCO includes an amplifier that provides the required signal gain, a resonator tank circuit that provides the required phase shift, and at least one frequency tuning circuit for tuning t... | 10/03/2006 |
| 7107030 | Transmitter and a modulator therefor A transmitter for a portable radio communication apparatus comprising a modulator having first port for inputting a baseband signal and a second port for inputting a local oscillator signal, and including means for rectifying the input local oscillator signal to pro... | 09/12/2006 |
| 7092675 | Apparatus and methods for generating radio frequencies in communication circuitry using multiple control signals A radio-frequency (RF) apparatus capable of transmitting RF signals includes transmitter path circuitry. The transmitter path circuitry includes a voltage-controlled oscillator (VCO) that generates an output signal. The frequency of the output signal of the VCO circ... | 08/15/2006 |
| 7072421 | IQ modulation systems and methods that use separate phase and amplitude signal paths and perform modulation within a phase locked loop A digital signal processor generates in-phase, quadrature-phase and amplitude signals from a baseband signal. A modulator modulates the in-phase and quadrature-phase signals to produce a modulated signal. A phase locked loop is responsive to the modulated signal. Th... | 07/04/2006 |
| 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 controlled oscillator (VCO) that has a discretely variable capacitanc... | 01/31/2006 |
| 6975686 | IQ modulation systems and methods that use separate phase and amplitude signal paths A digital signal processor generates in-phase, quadrature-phase and amplitude signals from a baseband signal. A modulator modulates the in-phase and quadrature-phase signals to produce a modulated signal. A phase locked loop is responsive to the modulated signal. Th... | 12/13/2005 |
| 6970052 | Modulator immune from temperature variation-induced change in modulation factor A modulation factor is kept immune from the influence of temperature variation. A modulator is provided with an operational amplifier to one of whose input ends are inputted video signals and to the other is applied a reference voltage and a video mixer into which a... | 11/29/2005 |
| 6965761 | Controlled oscillator circuitry for synthesizing high-frequency signals and associated method 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 controlled oscillator (VCO) that has a discretely variable capacitanc... | 11/15/2005 |
| 6963240 | Damping of LC ringing in IC (integrated circuit) power distribution systems A structure and method for damping LC (inductance-capacitance) ringing in integrated circuit (IC) power distribution systems. The structure comprises a resistance electrically connected in parallel with a plurality of electrical switches. The resistance and electric... | 11/08/2005 |
| 6907085 | Activation method of communications apparatus with a non-linear distortion compensation device First, a digital section constituting a linearizer is activated. Then, a feedback loop for updating a distortion compensation coefficient is opened. Then, the analog section on the antenna side is activated from an ADC, including a PA, etc., or a DAC. Then, both the... | 06/14/2005 |
| 6879218 | Frequency modulation corrector keeping a good oscillating signal quality and suppressing dependability of a modulation degree A correction circuit for a voltage-controlled oscillator (VCO) is arranged outwardly of the voltage-controlled oscillator. The oscillation of the selected frequency and the frequency modulation are carried out independently of each other. The correction circuit incl... | 04/12/2005 |
| 6771708 | Nonlinear compensator A nonlinear compensator comprising a signal processing section, a distortion detecting section, and a distortion correcting section. The signal processing section detects the time difference and phase difference between two signals by calculating correlation, synchr... | 08/03/2004 |
| 6400415 | System and method for predistorting signals to be amplified A system and method for predistorting a signal which is to be amplified by a non-linear amplifier. The system and method uses additional predistortion circuits to eliminate the predistortion caused by amplifier input circuits and amplifier output circuits... | 06/04/2002 |
| 6373902 | Device and method for linearizing transmitter in digital communication system A device for linearizing a transmitter in a digital radio communication system. In the device, a predistortion lookup table stores predistortion data determined by measuring in advance distortion characteristics of the transmitter with respect to input ba... | 04/16/2002 |
| 6353370 | Method and apparatus for modulation of a voltage controlled oscillator A method and apparatus for modulation of a voltage-controlled oscillator (VCO). The VCO receives a tuning control voltage for adjusting a center frequency of an output periodic signal formed by the VCO. In addition, the VCO receives a modulation control v... | 03/05/2002 |
| 6034573 | Method and apparatus for calibrating modulation sensitivity A method and apparatus for continuously calibrating the modulation sensitivity of a voltage controlled oscillator (VCO) within a modulator of a transmitter. In accordance with the present invention, the transmitter is coupled to the receiver in order to l... | 03/07/2000 |
| 5796782 | Digital modulator with Root-Nyquist filter A digital modulator having a pulse shaping filter which generates and accumulates impulse responses including prior impulse responses and posterior impulse responses to perform a Root-Nyquist raised cosine filtering. The pulse shaping filter includes a du... | 08/18/1998 |
| 5638404 | Pre-compensated frequency modulation (PFM) A system for transmitting FM signals comprised of apparatus for receiving an input data signal, apparatus for precompensating the received data signal, apparatus for applying the precompensated data signal to a constant envelope modulator to provide a mod... | 06/10/1997 |
| 5633893 | Digital modulation method with controlled envelope variation Continuous phase modulated (CPM) signals, such as quaternary CPFSK signals, are filtered to limit their bandwidth while simultaneously minimizing the amount of amplitude modulation and intersymbol interference introduced by this filtering process. By desi... | 05/27/1997 |
| 5592132 | Frequency modulator comprising an adjusting circuit In a frequency modulator (1) having an adjusting circuit by which frequency modulator an applied luminance signal of a color video signal that contains synchronization pulses is frequency modulated, while the chrominance signal of the color video signal i... | 01/07/1997 |
| 5579342 | Pre-compensated frequency modulation (PFM) A system for transmitting FM signals comprised of apparatus for receiving an input data signal, apparatus for precompensating the received data signal, apparatus for applying the precompensated data signal to a constant envelope modulator to provide a mod... | 11/26/1996 |
| 5535247 | Frequency modifier for a transmitter A transmitter has an oscillator (101, 201, 303, 401, 501) that operates at frequency k multiplied by fc, thus the oscillator (101, 201, 303, 401, 501) outputs a signal at an output frequency, kfc. Coupled to the oscillator (101, 201,... | 07/09/1996 |
| 5515013 | Fixed compromise equalization for a dual port FM modulator A dual port frequency modulator and method for eliminating the undesired affects caused by high port/low port phase differences in a standard dual port frequency modulator. The frequency modulator includes an inverse filter stage coupled to the input of a... | 05/07/1996 |
| 5404378 | Distortion compensating circuit In a distortion compensating circuit, an initial value sufficient to provide a distortion compensating effect is previously set in a memory storage for storing distortion compensating data, whereby the convergence time of the distortion compensating effec... | 04/04/1995 |
| 5357222 | Voltage controlled component including a capacitive diode biased to operate in the linear region The invention relates to a biased electronic circuit in which a voltage-controlled component has a characteristic with a non-linear portion and a substantially linear portion. The circuit is biased by a voltage being applied to one terminal of the compone... | 10/18/1994 |
| 5339054 | Modulated signal transmission system compensated for nonlinear and linear distortion In a modulated signal transmission system operable in response to an input digital signal of a baseband to produce a modulated signal through a nonlinear amplifier, a nonlinear converter is controlled by a control signal generator to compensate for not on... | 08/16/1994 |
| 5151668 | FM modulator for compensating modulation characteristics on each channel A frequency-modulation modulator in a cellular wireless telephone for modulating frequency after uniformly and linearly compensating for frequency characteristics to be suitable for each engaged channel in a cellular wireless telephone. Since frequency mo... | 09/29/1992 |
| 5126699 | Digitally compensated modulation system for frequency synthesizers A digitally compensated modulation system for frequency synthesizers has a single modulation input line with flat frequency response to zero hertz. The above is accomplished while eliminating circuit components and adjustments by integrating reference osc... | 06/30/1992 |
| 5107520 | Adaptive predistortion circuit for a digital transmission system An adaptive predistortion circuit for a digital transmission system includes a predistortion circuit (521, 522, 523) for predistorting the input data before they pass through a modulator (56) and then through an amplifier ... | 04/21/1992 |
