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| Number | Title | Issue Date |
| 8183951 | Modulator It is possible to restrain distortions generated in a mixer. A modulator includes a local signal source that generates an in-phase local signal, a multiplier that multiplies an in-phase baseband signal (I) and the in-phase local signal by each other, a phase inverte... | 05/22/2012 |
| 8085106 | Method and apparatus for dynamic modulation Circuits and methods of dynamic modulation are disclosed. A dynamic modulator is used to reduce measurable conducted and/or radiated electromagnetic interference (EMI). The dynamic modulator is configured to generate either a set of optimal frequency modulation dept... | 12/27/2011 |
| 7791428 | All-digital phase-locked loop, loop bandwidth calibration method, and loop gain calibration method for the same For decreasing errors within an analog phase-locked loop, an all-digital phase-locked loop (ADPLL) with digital components and digital operations is used. The ADPLL may also be used for direct frequency modulation (DFM). By defining a proportional path gain of an AD... | 09/07/2010 |
| 7417509 | Spread spectrum modulation of a clock signal for reduction of electromagnetic interference A spread spectrum frequency modulated oscillator circuit usable as a clock comprises a reference component such as a resistor, a voltage controlled oscillator and a first circuit coupled to the reference component and voltage controlled oscillator and configured to ... | 08/26/2008 |
| 7376399 | Weighted mixing circuitry for quadrature processing in communication systems Mixing circuitry for quadrature processing in communication systems and related methods are disclosed. The weighted mixing circuitry allows for arbitrary dividers to be utilized in generating the mixing signals for quadrature processing and thereby provides a signif... | 05/20/2008 |
| 7349672 | Digital signal transceiver A digital signal transceiver includes a frequency modulator for outputting a high-frequency signal frequency-modulated with a digital signal input thereto, a power amplifier, an antenna terminal, and an antenna switch. The antenna switch includes a first branch port... | 03/25/2008 |
| 7343015 | Method and apparatus for high fidelity wireless stereophonic transmission utilizing dual frequency carriers A method and system is disclosed for transmitting two related channels of signals through the air. A first channel of signals is modulated with a first carrier frequency, and a second channel of signals is modulated with a second carrier frequency. The modulated fir... | 03/11/2008 |
| 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 |
| 7333789 | Wide-band modulation PLL, timing error correction system of wide-band modulation PLL, modulation timing error correction method and method for adjusting radio communication apparatus having wide-band modulation PLL A broadband modulation PLL includes a PLL portion containing a voltage controlled oscillator (101), a frequency divider (105), a phase comparator (104) and a loop filter (103). A frequency-dividing ratio of the frequency divider (105 | 02/19/2008 |
| 7298220 | Method and apparatus for creating a multiple loop VCO Disclosed herein is a method and apparatus used to create an idealized voltage controlled oscillator (VCO) which allows very high modulation rates without the expected phase noise (jitter) which nominally comes from wide bandwidth VCOs. In this fashion, high quality... | 11/20/2007 |
| 7280611 | Nonlinear distortion compensating device A nonlinear distortion compensating device splits its operation into two processes. One is a compensation & amplification process for providing a receipt signal with a distortion compensating calculation and amplification before outputting the signal with phase and ... | 10/09/2007 |
| 7257166 | Data communication apparatus and method based on orthogonal frequency division multiple access A data communication apparatus and method based on OFDMA are provided. In a first user transmitting unit through which a user transmits user information to a base station in units of first symbol blocks each including M symbols, a first encoder generates a first sub... | 08/14/2007 |
| 7250823 | Direct digital synthesis (DDS) phase locked loop (PLL) frequency synthesizer and associated methods The phase locked loop (PLL) frequency synthesizer includes a phase detector receiving a reference signal, a controlled oscillator (e.g. a voltage controlled oscillator) connected to the phase detector and generating a synthesized frequency output signal based upon t... | 07/31/2007 |
| 7236057 | Spread spectrum clock generator A clock signal generator varies a frequency of a digital clock over a selected range of frequencies. The generator employs a divider for lowering a frequency of a clock signal. A counter increments synchronously with the signal, and causes a selected sequence of out... | 06/26/2007 |
| 7233210 | Spread spectrum clock generator A clock signal generator varies a frequency of a digital clock over a selected range of frequencies. The generator employs a divider for lowering a frequency of a clock signal. A counter increments synchronously with the signal, and causes a selected sequence of out... | 06/19/2007 |
| 7224238 | Frequency modulator, frequency modulating method, and wireless circuit A voltage controlled oscillator 1, a variable frequency divider 2, a phase comparator 3, and a loop filter 4 form a Phase Locked Loop (PLL). A sigma-delta modulator 5 sigma-delta modulates data obtained by adding a fractional part ... | 05/29/2007 |
| 7215717 | Distortion compensation circuit Disclosed is a distortion compensation circuit that reduces the time for convergence of distortion compensation data, without impairing any stability of distortion compensation. The circuit includes an error computation and compensation data updating section that re... | 05/08/2007 |
| 7212581 | 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 image rejection may be omitted if desired) and comprises a simplified ... | 05/01/2007 |
| 7157985 | PLL modulation circuit and polar modulation apparatus First and second calibration signals (308, 309) are sent to a frequency divider (102) and an adder (116) of a PLL section (100A), demodulated in a demodulator (111), filtered through a low pass filter (113) and a high pass f... | 01/02/2007 |
| 7158580 | Data pulse spectrum control The present invention reduces adjacent channel interference for a wireless peripheral device. A direct digital synthesizer generates a waveform having intermediate angular changes during a transition time between symbol intervals. After the transition time, the dire... | 01/02/2007 |
| 7138838 | Phase locked loop A variable loop bandwidth phase locked loop in which, upon input of a succession of signals “1”, no modulated signal degradation occurs and even at a high symbol rate, the reference signal frequency remains low and the sampling frequencies of a phase-frequency d... | 11/21/2006 |
| 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 |
| 7130579 | Adaptive radio transceiver with a wide tuning range VCO An exemplary embodiment of the present invention described and shown in the specification and drawings is a transceiver with a receiver, a transmitter, a local oscillator (LO) generator, a controller, and a self-testing unit. All of these components can be packaged ... | 10/31/2006 |
| 7127020 | Frequency synthesis loop having controlled loop gain 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 preemphasis coefficients for compensating the frequency conversion gain of the... | 10/24/2006 |
| 7099643 | Analog open-loop VCO calibration method An analog open-loop voltage controlled oscillator (VCO) calibration circuit and method for selecting the frequency of the VCO for a phase locked loop (PLL). A frequency divider module produces a 50% duty cycle divided local oscillation and a 50% duty cycle di... | 08/29/2006 |
| 7095798 | System and method for post filtering peak power reduction in multi-carrier communications systems A system and method for post filtering signal peak reduction adapted for use in a multi-carrier communication system incorporating a source of a multi-carrier communication signal band limited in plural bands corresponding to the plural carriers. A first signal path... | 08/22/2006 |
| 7075383 | Frequency modulator, frequency modulating method, and wireless circuit A voltage controlled oscillator 1, a variable frequency divider 2, a phase comparator 3, and a loop filter 4 form a Phase Locked Loop (PLL). A sigma-delta modulator 5 sigma-delta modulates data obtained by adding a fractional part ... | 07/11/2006 |
| 7016431 | Transmitter for transmitting signals over radio channels and method for transmitting signals over radio channels A transmitter for sending signals over wireless channels and a method of sending signals over wireless channels are described. The transmitter and the method are used to determine a transfer characteristic of an amplifier (8) in the transmitter. Test signals ... | 03/21/2006 |
| 6993090 | Distortion compensation apparatus and distortion compensation method A method and apparatus for compensating for a distortion component of a device such as a power amplifier can be achieved without requiring a demodulator. A voltage controlling a gain of the amplitude of the input signal based on the amplitude control signal generate... | 01/31/2006 |
| 6985539 | Peak suppression method and data transmission apparatus A peak suppression method detects a peak value exceeding a threshold value of a transmitting signal, forms a peak value prediction signal which is limited to a noise cancelling frequency band of a receiving end, based on the detected peak value of the transmitting s... | 01/10/2006 |
| 6973328 | Millimeter wave band transmitter, millimeter wave band receiver and millimeter wave band communication apparatus carrying out radio communication in millimeter wave band region A millimeter wave band communication apparatus includes a millimeter wave band transmitter receiving a plurality of input modulation signal waves to transmit a millimeter wave band multiplex signal wave, and a millimeter wave band receiver receiving the transmitted ... | 12/06/2005 |
| 6973138 | Advanced adaptive pre-distortion in a radio frequency transmitter The present invention is related to methods and apparatus that advantageously permit the more efficient use of an input range of an analog-to-digital converter used by an adaptive predistortion linearized RF transmitter. A main signal component of a down-converted o... | 12/06/2005 |
| 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 |
| 6917248 | Broadband voltage controlled oscillator supporting improved phase noise VCO (voltage controlled oscillator) circuits typically exhibit a frequency dependent variation in their output signal with respect to a tuning voltage applied to a tuning port on the VCO circuit. For a fixed tuning voltage the VCO circuit forms a stable oscillator. ... | 07/12/2005 |
| 6680658 | Modulation circuit for wireless installation A modulation circuit includes a band restriction filter 2, an attenuator 3, a modulator 4, a reference voltage generator 8, a comparing reference voltage generator 9, a voltage comparator 10 and an attenuator controller 7. The band restriction filter 2 re... | 01/20/2004 |
| 6677816 | Circuit arrangement for demodulating signals In a circuit arrangement for demodulating signals, particularly frequency-modulated signals, in which a limiter, to whose input the signals to be modulated can be applied, is followed by a demodulator from whose output the demodulated signals can be deriv... | 01/13/2004 |
| 6587011 | Low cost digital FM modulator A modulator including a noise shaper receiving the input signal and providing a signal coded over one bit, a phase loop including an adder and a shift register. The adder receives the signal coded over one bit, the output of the shift register, and a cons... | 07/01/2003 |
| 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 and a frequency output, a first and second feedback loop dig... | 04/15/2003 |
| 6545557 | FM signal oscillator circuit and modulation level control method An FM signal oscillator circuit includes a resonator having a graded- or abrupt-junction variable capacitance diode that is producible through standard IC manufacturing processes but causes an inconstant modulation level. The FM signal oscillator circuit,... | 04/08/2003 |
| 6518849 | Dynamic delay compensation versus average switching frequency in a modulator loop and methods thereof The present invention monitors the average switching frequency at the output of the comparator and adjusts the delay compensation accordingly. That is, the switching frequency monitoring circuit looks at the average switching frequency and maintains the a... | 02/11/2003 |
