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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...
7567131 Device for ultra wide band frequency generating  
Devices ( 1 ) for exchanging ultra wide band signals comprise frequency translating stages ( 20,30 ) for frequency translating signals and oscillating stages ( 40 ) for supplying main...
7561002 Method and apparatus for frequency modulating a periodic signal of varying duty cycle  
A method and apparatus for frequency modulating a PWM involves 1) generating a high frequency carrier signal much greater in frequency than the PWM signal; 2) modulating the high frequency signal...
7535311 Direct wideband modulation of a frequency synthesizer  
A frequency synthesizer modulates a signal by directly modulating a signal input to a voltage controlled oscillator (VCO) associated with the frequency synthesizer. The modulation signal has 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...
7519113 Noise detection device  
Noise detection is performed by using the output of the phase comparator that the PLL comprises. The phase comparator outputs a signal that is based on the phase difference between the output of...
7508276 Frequency modulator  
A frequency modulator is provided for generating an output signal with a frequency that is a function of a modulation signal, wherein the modulation signal can assume N≧2 different discrete...
7502602 Method and apparatus to compensate loop error of phase locked loop  
Briefly, according to embodiments of the invention, there is provided a method and an apparatus to compensate for a closed loop response error of a transfer function of a phase locked loop unit.
7486743 Device and method of measuring frequency domain response in RF modulator  
Embodiments of the invention describe a method and a device for digital measurement of the momentary frequency response of the phase-path component of a modulator, based on digitally sampling the...
7453325 Single point modulator having a PLL circuit  
A single-point modulator ( 1 ) has a PLL circuit ( 2 ) and a programmable frequency divider ( 7 ) whose control connection is connected to a circuit branch for injecting a digital modulation signal...
7439813 Method and system for generating carrier frequencies for UWB application  
Apparatus and method for generating first, second and third carrier frequencies of 3432 MHz, 3960 MHz and 4488 MHz respectively, for use in a wireless transmission system deploy only first and...
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...
7417513 System and method for signal filtering in a phase-locked loop system  
A system and method for modulating a phase component of an electromagnetic signal includes a phase/frequency detector having first and second inputs and an output. The first phase/frequency...
7411461 Frequency and/or phase lock loops with beat frequency estimation  
A control loop ( 10 ) for producing an output signal with a stable nominal frequency is provided. The control loop includes inputs for reference ( 11 ) and oscillator ( 25 ) output signals, a beat...
7408416 Phase locked loop, signal generating apparatus and synchronization method  
A phase locked loop for outputting a high frequency signal by executing synchronization and frequency conversion based on an input signal includes a control-type oscillator, and a phase comparator...
7406144 Clock generator circuit using phase modulation technology and method thereof  
A clock generator circuit, comprising: a multi-phase clock signal generator for generating a plurality of clock signals having a same frequency but difference phases according to a reference clock...
7394885 Spread-spectrum clock signal generator  
A spread-spectrum clock signal generator includes a circuit loop receiving a reference signal at a reference frequency and adapted to generate an output signal at an output frequency dependent on...
7391270 Phase locked loop and method for phase correction of a frequency controllable oscillator  
A phase locked loop is disclosed and includes a frequency divider circuit with a settable division ratio in a feedback path. The division ratio is produced using a control circuit which, besides an...
7382201 Signal generating apparatus and method thereof  
A signal generating apparatus is disclosed for generating a synthesized signal according to an input signal, the signal generating apparatus includes a phase-locked loop device for generating the...
7372337 Voltage controlled oscillator comprising an injection pulling compensation circuit  
The present invention relates to a method for stabilising the operation of a voltage controlled oscillator driven by a phase locked loop, the voltage controlled oscillator delivering an RF signal...
7365609 Hybrid stochastic gradient based digitally controlled oscillator gain KDCO estimation  
A novel hybrid stochastic gradient adaptation apparatus and method for calibrating the gain of an RF or non-RF digitally controlled oscillator (DCO). The adaptation algorithm determines a true...
7342986 Digital PLL device  
A phase-locked-loop device includes a clock generator for generating a reference clock based on a binarized playback signal and a frequency of run-length data and for generating N-phase clocks...
7332972 Phase-locked loop circuit  
Phase locked loop circuit ( 105 ) having a double entry VCO ( 158 ) and two independent charge pumps ( 171, 172 ), each connected with one of the entries of the VCO. Each of the VCO entries has a...
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...
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...
7288999 Pre-distortion system for a synthesizer having modulation applied in the reference path  
A system providing a phase or frequency modulated signal is provided. In general, the system includes a phase locked loop (PLL) having a fractional-N divider in a reference path of the PLL...
7271678 Apparatus and method for generating frequencies  
A frequency generation apparatus and a method are provided. The frequency generation apparatus for generating a plurality of center frequencies for use in multi-band hopping communication,...
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...
7268640 Frequency generator arrangement  
A frequency generator is provided. The generator comprises two voltage controlled oscillators generating a first signal of a given multiple of a predetermined raster frequency, and a second signal...
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...
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 ...
7183860 Gain calibration of a digital controlled oscillator  
A novel apparatus for and a method of estimating, calibrating and tracking in real-time the gain of a radio frequency (RF) digitally controlled oscillator (DCO) in an all-digital phase locked loop...
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...
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...
7126436 Frequency synthesizer having a more versatile and efficient fractional-N control circuit and method  
A frequency synthesizer is provided having a fractional-N control circuit and method that can selectively apply any fractional ratio to a frequency divider within the feedback loop of a PLL. A...
7123666 Gaussian minimum shift key transmitter with feedforward phase compensation  
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...
7123665 Method and apparatus for measuring phase error of a modulated signal  
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...
7109816 Dual port modulator comprising a frequency synthesiser  
A dual-port modulator comprising a first Phase Locked Loop (‘PLL’) ( 15 ) including a first Voltage Controlled Oscillator (‘VCO’) ( 10 ), a first variable frequency divider ( 20 ), a first...
7102454 Highly-linear signal-modulated voltage controlled oscillator  
A VCO system embodying the features of the present invention includes a frequency tuning circuit, a modulation circuit coupled in a parallel fashion with the frequency tuning circuit, a band tuning...
7075384 Delta-sigma modulated fractional-N PLL frequency synthesizer and wireless communication apparatus  
Disclosed is a delta-sigma modulated fractional-N PLL frequency synthesizer which performs fractional-N by modulating a divider that divides output frequencies from a voltage controlled oscillator....
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...
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...
7053727 Trimming of a two point phase modulator  
Method and system are disclosed for automated calibration of the VCO gain in phase modulators. The method and system of the invention comprises synthesizing, in a phase modulator, a signal having a...
7053726 Voltage control oscillator having modulation function  
There is provided a VCO having a modulation function capable of easily constituting a correction circuit which can obtain a predetermined modulation degree even when element irregularities are...
Matches 1 - 50 out of 228 1 2 3 4 5 >