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| Number | Title | Issue Date |
| 7940142 | Two-point modulation polar transmitter architecture and method for performance enhancement A polar transmitter includes a two-point modulation phase-locked loop (PLL) for producing an RF signal with a wide bandwidth. The PLL includes a first input for receiving a phase signal of a variable-envelope modulated signal and providing the phase signal along a f... | 05/10/2011 |
| 7920033 | Systems and methods for frequency modulation adjustment A system and method for providing, among other things, wideband phase modulation is described. Several embodiments include a scaling network for scaling an input modulation signal in accordance with a scaling parameter and thereby generating a scaled modulation sign... | 04/05/2011 |
| 7893788 | Charge pump-based frequency modulator A charge pump-based frequency modulator is provided. The charge pump-based frequency modulator comprises an analog phase correction path comprising a varactor and a charge pump. The varactor is coupled to an output of the charge pump-based frequency modulator. The c... | 02/22/2011 |
| 7760042 | Phase locked loop based frequency modulator with accurate oscillator gain adjustment A frequency modulator includes a tuning circuit configured to determine a nominal gain characteristic of a digitally controlled oscillator (DCO) in a first mode, and to determine an actual gain characteristic of the DCO in a second mode using the nominal gain charac... | 07/20/2010 |
| 7728690 | Method and apparatus for compensating for tuning nonlinearity of an oscillator Techniques to compensate for nonlinearity of a tuning function of an oscillator are described. The tuning nonlinearity of the oscillator may be modeled as a disturbance input to the oscillator and may be compensated with an equal but opposite disturbance. In one des... | 06/01/2010 |
| 7679468 | Kfrequency tracking system using a digital correlator An apparatus for providing a two point phase/frequency modulation system is disclosed herein. The apparatus includes a first network configured to introduce an offset to center a signal applied to a VCO. The apparatus further includes a second network configured to ... | 03/16/2010 |
| 7579922 | Two-point modulation polar transmitter architecture and method for performance enhancement A polar transmitter includes a two-point modulation phase-locked loop (PLL) for producing an RF signal with a wide bandwidth. The PLL includes a first input for receiving a phase signal of a variable-envelope modulated signal and providing the phase signal along a f... | 08/25/2009 |
| 7522011 | High pass modulation of a phase locked loop A radio frequency modulator based on direct frequency/phase modulation of output signal of a controllable oscillator (724) that is a part of a phase locked loop (PLL) provides a direct modulator that is able to operate over a wide frequency range with a flat ... | 04/21/2009 |
| 7443905 | Apparatus and method for spread spectrum clock generator with accumulator A method and apparatus for spread spectrum clock generation is provided. Modulation of the clock signal may be accomplished with an N/Nā1 clock divider. The N/Nā1 clock divider is configured to divide the clock signal by N or Nā1, depending on the carry output... | 10/28/2008 |
| 7443261 | Phase modulating apparatus, communication device, mobile wireless unit, and phase modulating method A multimode-based phase modulating apparatus capable of reducing the degradation of modulation precision and suppressing the unnecessary power consumption. This apparatus has a switch for switching the modulation modes of a PLL circuit between a single-point modulat... | 10/28/2008 |
| 7427903 | Polar modulator and a use thereof A polar modulator has a low AM-AM and AM-PM distortion comprises a phase locked loop. The phase locked loop is designed for outputting a high-frequency signal with a frequency derived from a phase modulation signal at an actuating input of the phase locked loop. A f... | 09/23/2008 |
| 7420433 | Phase lock loop RF modulator system A phase lock loop RF modulator system including a phase lock loop circuit having a phase detector circuit responsive to an input reference signal and a feedback signal, an oscillator circuit responsive to the phase detector circuit for providing an output signal, a ... | 09/02/2008 |
| 7417514 | Method for modulating phase or frequency in a communication system using clock division A direct division modulator is provided. The direct division modulator includes a symbol mapper converting the input data from a binary bitstream to a desired frequency deviation, such as where the frequency deviation data encodes the information from the bitstream.... | 08/26/2008 |
| 7356091 | Apparatus, methods and articles of manufacture for signal propagation using unwrapped phase The invention relates to a system for processing an electromagnetic input signal in which processing circuitry may be used to produce a bounded phase signal, such as by calculating an n-bit 2's compliment number in the range of [ā1, 1] from phase sample informatio... | 04/08/2008 |
| 7340007 | Apparatus, methods and articles of manufacture for pre-emphasis filtering of a modulated signal The invention is directed to a system for determining a transfer function for emphasizing an electromagnetic signal prior to being processed by determining a discrete transfer function for a processing system, such as a wideband phase modulator; determining a target... | 03/04/2008 |
| 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 |
| 7321735 | Optical down-converter using universal frequency translation technology A method and system for converting an optical signal to electrical information signals, including demodulated baseband information signals and modulated baseband signals at multiple harmonics. In an embodiment, the optical information signal is amplitude modulated w... | 01/22/2008 |
| 7319362 | Power amplifying apparatus A power amplifying apparatus has: a signal converting section (20) which converts an input signal of an orthogonal coordinate system to an amplitude signal and phase signal of a polar coordinate system, which then converts the phase signal to an orthogonal-co... | 01/15/2008 |
| 7304545 | High latency timing circuit A phase locked loop (PLL) circuit, comprises a frequency integrator circuit that receives a target signal, a phase shift signal and a frequency gain correction parameter and that selectively disables tracking frequency offset based on a value of the frequency gain c... | 12/04/2007 |
| 7295826 | Integrated frequency translation and selectivity with gain control functionality, and applications thereof Methods and apparatuses for frequency selectivity and frequency translation, and applications for such methods and apparatuses, are described herein. The method includes steps of filtering an input signal, and down-converting the filtered input signal. The filtering... | 11/13/2007 |
| 7292835 | Wireless and wired cable modem applications of universal frequency translation technology Frequency translation and applications of same are described herein, including cable modem applications. Such applications include, but are not limited to, frequency down-conversion, frequency up-conversion, enhanced signal reception, unified down-conversion and fil... | 11/06/2007 |
| 7292107 | Modulation method and apparatus with adjustable divisors of the dividers in phase-locked loop A modulation method and a modulation apparatus in a phase-locked loop (PLL) provided. The modulation apparatus comprises a modulator, a crystal oscillator, a controllable R-divisor frequency divider, a controllable N-divisor frequency divider and a voltage-controlle... | 11/06/2007 |
| 7289004 | Dual port modulator The present invention relates generally to the field of frequency modulation, and in particular to dual port frequency modulators. The present invention provides a frequency modulator comprising a phase lock loop circuit (108) for receiving and modulating a c... | 10/30/2007 |
| 7277503 | Apparatus and method for synchronizing sampling frequency and carrier frequency in a multi-carrier communication system An apparatus and method for synchronizing sampling frequencies of a receiver and a transmitter of a multi-carrier communication system is provided. The receiver includes an estimator for estimating a frequency offset by employing an additional angle rotation of a re... | 10/02/2007 |
| 7276985 | Transmission modulation apparatus, communication apparatus and mobile wireless apparatus Provided is a transmission modulation apparatus, using polar modulation of two-point modulation scheme, capable of completing a timing adjustment of a BB phase modulation signal and BB amplitude modulation signal in a short time. A phase modulation section (10 | 10/02/2007 |
| 7274748 | AM to FM correction system for a polar modulator A transmitter for a mobile terminal including a polar modulator that compensates for amplitude to frequency distortion (AM to FM distortion) of a power amplifier in the transmit chain is provided. In general, the modulator includes a polar converter that converts an... | 09/25/2007 |
| 7271666 | Method and apparatus for canceling jitter in a fractional-N phase-lock loop (PLL) A method and apparatus improves the stability and noise performance of frequency synthesis and synchronization circuits. A cancellation circuit provides an error signal that is a measure of integrated quantization error in a delta-sigma modulator that controls the r... | 09/18/2007 |
| 7266171 | Phase-locked loop circuit and radio communication apparatus using the same A communication apparatus includes a phase-locked loop circuit which receives a first signal having a frequency and converts it into an output signal having a transmission frequency and includes a current output type phase comparator which converts a phase differenc... | 09/04/2007 |
| 7248664 | Timesliced discrete-time phase locked loop A time-sliced discrete-time Phase Locked Loop which is suitable for simultaneously synchronizing multiple input signals to multiple output signals is provided by implementing a discrete-time phase detector, loop filter, and voltage controlled oscillator that togethe... | 07/24/2007 |
| 7236063 | Broadband modulation PLL, and modulation factor adjustment method thereof A problem of the present invention is to provide a wide band modulation PLL having good modulation accuracy at low cost. With respect to a PLL having a VCO (21), a frequency divider (22), a phase comparator (23), a charge pump (24) and a ... | 06/26/2007 |
| 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 |
| 7215215 | Phase modulation apparatus, polar modulation transmission apparatus, wireless transmission apparatus and wireless communication apparatus A phase modulation apparatus is provided whereby excellent RF phase modulation signals can be obtained even when the modulation sensitivity of a voltage controlled oscillator varies. Phase modulation apparatus 100 has: phase detector 105 that performs ... | 05/08/2007 |
| 7203262 | Methods and apparatus for signal modification in a fractional-N phase locked loop system A phase locked loop includes a buffer that synchronizes the transmission of the new count value to the completion of the previous count to avoid errors caused by dithering. The buffer is connected to a count input of the counter and transmits the new count upon rece... | 04/10/2007 |
| 7199677 | Frequency modulation apparatus A frequency modulation apparatus 100 has a synthesizer 101, a differentiator 102 that differentiates phase modulation data and generates differential phase modulation data, an adder 103 that adds together that differential phase modulatio... | 04/03/2007 |
| 7196587 | Waveform lineariser An improved apparatus and method of generating swept frequency waveforms in the field of digital lineariser technology, using a phase-locked loop frequency synthesiser, is provided. Preferably, a ramp generator 120 is used to apply a modulation signal ... | 03/27/2007 |
| 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 |
| 7180385 | Direct frequency modulation system having an IQ mixer in the phase locked loop A transmission arrangement includes a step-up frequency mixer that converts a modulation signal to a transmission frequency. The step-up frequency mixer is arranged within a phase locked loop that further comprises a frequency divider that is likewise supplied with ... | 02/20/2007 |
| 7170867 | Radio frequency data communications device A radio frequency identification device includes an integrated circuit including a receiver, a transmitter, and a microprocessor. The receiver and transmitter together define an active transponder. The integrated circuit is preferably a monolithic single die integra... | 01/30/2007 |
| 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 |
| 7154347 | Compensating method for a PLL circuit that functions according to the two-point principle, and PLL circuit provided with a compensating device A PLL circuit is tuned to a first frequency by using a first digital modulation signal and subsequently tuned to a second frequency by using a second digital modulation signal. A differential signal, that is a function of the change in voltage of a VCO control signa... | 12/26/2006 |
