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7599462 Hybrid analog/digital phase-lock loop with high-level event synchronization  
A hybrid analog/digital phase-lock loop with high-level event synchronization provides a mechanism for generating a low-jitter clock from a timing reference that has a high jitter level and...
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...
7579919 Method and apparatus for compensating temperature changes in an oscillator-based frequency synthesizer  
Architectures for compensating the frequency drift of an oscillator based frequency synthesizer circuit due to the change of temperature are disclosed. By applying a digitally controlled frequency...
7573348 Arrangement and method for determining a gradient factor for a digitally controlled oscillator, and phase locked loop  
An arrangement for determining a gradient factor for a digitally controlled oscillator has a data alignment device and an identification device. The data alignment device can be supplied a...
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...
7482883 Gain normalization of a digitally controlled oscillator in an all digital phase locked loop based transmitter  
A novel mechanism for gain normalization of a digitally controlled oscillator (DCO) in an all digital phase locked loop (ADPLL)-based transmitter that is operative to split the gain normalization...
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/N−1 clock divider. The N/N−1 clock divider is configured to...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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 ...
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...
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 ( 100 A), demodulated in a demodulator ( 111 ), filtered through a...
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...
7142070 Two-point modulator arrangement  
A two-point modulator arrangement is specified, said arrangement being developed with respect to conventional two-point modulators to the effect that the high-pass coupling-in point of the...
7142063 Two-point modulator comprising a PLL circuit and a simplified digital pre-filtering system  
A two-point modulator includes a PLL circuit and a simplified digital pre-filtering system. The two-point modulator includes a first circuit path for impressing an analog modulation signal into a...
7109805 Direct modulator for shift keying modulation  
A system for direct modulation is disclosed. Embodiments of the direct modulator for shift-keying modulation include impressing baseband data on a radio frequency (RF) signal at an oscillator by...
7081798 Variable frequency synthesizer comprising a sigma-delta modulator  
A variable frequency synthesizer comprising a sigma-delta modulator is provided. Such synthesizers provide an exact average frequency whereas the instantaneous frequencies varies. The sigma-delta...
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...
7075376 Frequency synthesizer using digital pre-distortion and method  
A method includes identifying a setting for a capacitor bank associated with a voltage-controlled oscillator in a closed-loop phase-locked-loop. The setting represents a combination of one or more...
6946915 Maximally digitized fractional-N frequency synthesizer and modulator with maximal fractional spurs removing  
A fractional-N frequency synthesizer using the first order Delta-Sigma frequency discriminator which is composed of only a dual modulus frequency divider and a D flip-flop is used to replace the...
6933798 Trimming method and trimming device for a PLL circuit for two-point modulation  
In the case of a trimming method for a PLL circuit operating based on the principle of a two-point modulation, the PLL circuit is locked without any modulation being impressed and then an analog...
6833767 Frequency synthesizer using digital pre-distortion and method  
A method includes identifying a setting for a capacitor bank associated with a voltage-controlled oscillator in a closed-loop phase-locked-loop. The setting represents a combination of one or more...
6801092 Phase locked loop that avoids false locking  
A phase locked loop includes a difference detector, a loop filter, a controlled oscillation module, and a frequency translation module. The difference detector is operably coupled to determine a...
6734749 Direct modulated phase-locked loop  
Direct frequency modulation of a phase-locked loop (PLL) output signal is achieved by means of a modulation signal comprising a digital sequence. The digital modulation signal is coupled to the...
6724265 Compensation for oscillator tuning gain variations in frequency synthesizers  
A system is provided for compensating for tuning gain variations in a phase lock loop. Compensation is performed by a calibration system that estimates the tuning gain of the oscillator and then...
6711229 Method of synchronizing phase-locked loop, phase-locked loop and semiconductor provided with same  
There is provided a method of synchronizing a phase-locked loop (PLL) which is capable of reducing an area occupied by the PLL in a chip of the semiconductor device and shortening a lock-up time...
6693969 Phase-locked loop methods and structures for generating modulated communication signals with nonconstant envelopes  
Phase-locked loop methods and structures are provided for generating modulated communication signals with nonconstant envelopes. These methods and structures realize the improved communication...
6674331 Method and apparatus for simplified tuning of a two-point modulated PLL  
A method and apparatus are disclosed for tuning a voltage controlled oscillator (VCO) having two point modulation used in a phase lock loop modulation system. A loop correction voltage applied to a...
6515553 Delta-sigma based dual-port modulation scheme and calibration techniques for similar modulation schemes  
PLL frequency synthesizers and their calibration techniques are described. The PLL frequency synthesizers are used to generate digital modulation of a carrier signal. A digital frequency divider in...
6476684 Low noise frequency modulator having variable carrier frequency  
A frequency modulator having variable carrier frequency is provided. A VCO frequency-modulates an oscillator input signal using an oscillation frequency set by a set signal as the carrier...
6434187 Digital radiofrequency transceiver  
A method for radiofrequency (RF) transmission of digital information includes generating an RF signal using a voltage-controlled oscillator (VCO), stabilizing the RF signal from the VCO by...
6345173 Frequency modulator  
A frequency modulator ( 50, 150 ) for modulating a carrier signal according to a modulation data signal to provide a modulated output signal (RFout), comprises a reference signal generator ( 54,...
6268780 Frequency synthesizer with digital frequency lock loop  
A frequency synthesizer with a digital frequency lock loop (FLL) having a fast frequency lock time uses a frequency counter circuit in the feedback loop to count the output signal frequency and...
6246297 Phase and/or frequency modulated frequency synthesizer having two phase locked loops  
This device includes a frequency synthesizer (12) comprising two phase-locked loops (L1 and L2). The one comprises a low-pass filter (68) and the other a high-pass filter (49). The loop with the...
6211748 FM modulator  
6211747 Wideband modulated fractional-N frequency synthesizer  
A direct modulation multi-accumulator fractional-N frequency synthesizer 1 for generating a carrier signal 150 modulated by a modulation signal 170, 121 is disclosed. The frequency synthesizer...
6172579 Three point modulated phase locked loop frequency synthesis system and method  
The present invention relates to a frequency modulated system, and a method for operating same, including a phase locked loop frequency synthesizer circuit which synthesizes a carrier frequency...
6160861 Method and apparatus for a frequency modulation phase locked loop  
In accordance with the present invention, a frequency modulating phase-locked-loop (FMPLL) (100) architecture is implemented. The frequency of the FMPLL (100) is controlled using a current...
6094101 Direct digital frequency synthesis enabling spur elimination  
The present invention, generally speaking, provides improved methods of generating clean, precisely-modulated waveforms, at least partly using digital techniques. In accordance with one aspect of...
5983077 Systems and methods for automatic deviation setting and control in radio transmitters  
A frequency modulation (FM) radio transmitter, such as a cellular telephone, includes an automatic deviation control system to automatically compensate for varying sensitivity of the FM...
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