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7616066 Oscillation device and controlling method therefor  
An oscillation device includes a reference oscillation unit for generating an oscillating signal of a specific frequency; a voltage-controlled oscillation unit for generating a output oscillation...
7586378 Method and system for using a frequency locked loop logen in oscillator systems  
Aspects of a method and system for using a frequency locked loop LOGEN in oscillator systems may include generating an oscillating signal via one or more circuits comprising a feedback loop. The...
7538620 Phase lock control system for a voltage controlled oscillator  
A phase lock control system is presented for controlling a voltage controlled oscillator. The system includes a voltage controlled oscillator that produces a frequency signal exhibiting an output...
7538623 Phase locked loop modulator calibration techniques  
A method for calibrating a phase locked loop begins by determining a gain offset of a voltage controlled oscillator of the phase locked loop. The processing then continues by adjusting current of a...
7508897 PLL circuit and high-frequency receiving device  
A PLL circuit has (i) a counter which divides a frequency of a VCO output whose frequency has been divided by a frequency divider and (ii) a memory which stores plural patterns of set cycles of the...
7504894 Phase locked loop circuit and semiconductor integrated circuit device using the same  
To provide a phase locked loop circuit that is capable of performing an automatic adjustment that satisfies a desired characteristic not depending on a process variation and an environmental...
7498891 Method for calibration of an oscillator for a microcontroller chip operation  
To calibrate an oscillator for microcontroller chip operation, an RC circuit is coupled to the microcontroller circuitry and a voltage signal is applied to the capacitor for changing the voltage...
7486146 Loop system capable of auto-calibrating oscillating frequency range and related method  
A loop system capable of auto-calibrating an oscillating frequency range includes a frequency error detector, a voltage controlled oscillator (VCO), a voltage input unit, and a switch. The...
7479834 Analogue self-calibration method and apparatus for low noise, fast and wide-locking range phase locked loop  
A phase lock loop (PLL) frequency synthesizer includes a reconfigurable voltage controlled oscillator (VCO) with three modes of operation: a Linear-High-gain, Zero-gain, and Low-gain mode. During...
7463097 Systems involving temperature compensation of voltage controlled oscillators  
Systems involving temperature compensation of voltage controlled oscillators are provided. In this regard, a representative system incorporates: a voltage controlled oscillator (VCO) having a...
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...
7436263 Apparatus and method for presenting a modulated output signal at an output locus  
An apparatus that presents an output signal that is modulated by input signal includes: (a) A signal source providing a signal at a reference frequency. (b) A frequency comparer coupled with the...
7420427 Phase-locked loop with a digital calibration loop and an analog calibration loop  
A phase-locked loop (PLL) architecture ( 100 ) is provided that includes a voltage-controlled oscillator (VCO) ( 116 ). The PLL architecture ( 100 ) also includes a digital calibration loop ( 132 )...
7408415 Voltage controlled oscillator phase locked loop circuit with loop filter capacitance tuning  
A phase locked loop circuit comprises a voltage controlled oscillator with a control input to which a variable control voltage is applied and a phase-frequency discriminator with an output...
7391273 Clock signal output apparatus and control method of same, and electric apparatus and control method of same  
The clock signal output device has a crystal oscillator for generating a reference clock signal and generating and outputting an output clock signal having a prescribed frequency on the basis of...
7388437 System and method for tuning a frequency synthesizer  
An apparatus for generating an output signal having a particular frequency includes an oscillator, a first tuning module, and a second tuning module. The oscillator generates an output signal...
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...
7362826 Receiver including an oscillation circuit for generating an image rejection calibration tone  
A receiver circuit includes an oscillator circuit configured to generate a calibration tone and a phase locked loop (PLL) reference signal. An output frequency of the VCO may be divided by...
7323944 PLL lock management system  
A PLL includes a charge pump, a loop filter, a VCO, and a calibration unit. The calibration unit performs coarse tuning to select one or multiple frequency ranges, performs fine tuning to determine...
7315214 Phase locked loop  
A phase locked loop includes a controlled oscillator for delivering an output signal at a determined output frequency, and a variable frequency divider for converting the output signal into a...
7301414 PLL circuit, radio-communication equipment and method of oscillation frequency control  
A Phase-Locked Loop (PPL) circuit includes a voltage controlled oscillator (VCO), a reference signal oscillator, first and second frequency dividers, a phase comparator, a charge pump and a loop...
7301416 Semiconductor integrated circuit for wireless communication  
A semiconductor integrated circuit with a PLL (Phase Locked Loop) built therein is used in a semiconductor integrated circuit for wireless communication. The PLL circuit generates an oscillation...
7288997 Phase lock loop and the control method thereof  
A phase lock loop and the control method thereof. The phase lock loop adjusts operating states automatically to generate a feedback clock for tracing a reference clock. The control method generates...
7215207 Phase and frequency detection circuits for data communication systems  
In one embodiment, a phase-locked loop system in a receiver samples received incoming data using a first clock and a second clock that have the same frequency but are out of phase with each other....
7205853 Method to configure phase-locked loop dividing ratio  
A system and method for configuring a phased-lock loop (PLL) dividing ratio which does not require the phased-lock loop circuit to lock. In one embodiment, the method includes inducing a...
7203149 PLL circuit and data read-out circuit  
Disclosed is a PLL circuit having a voltage-controlled oscillator, to which a difference voltage across non-inverting and inverting input terminals is input as a control voltage, for oscillating at...
7199673 Precharge circuit  
A precharge circuit that initializes an electronic filter to a middle voltage level of an operational voltage includes a filter isolation device, a filter communication device, and an initializing...
7183863 Self-initializing frequency detector  
A phase-locked loop (PLL) locks onto an input signal to provide an output signal that is proportional in frequency to the input signal. The PLL also detects whether an input signal's frequency...
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...
7173494 Method and system for operating a feedback system for a voltage controlled oscillator that involves correcting for offset related to the feedback system  
An offset related to a feedback system for a VCO is quantified and then a parameter of the feedback system is adjusted in response to the quantified offset to correct for the offset. Correcting for...
7095287 Method and apparatus to achieve a process, temperature and divider modulus independent PLL loop bandwidth and damping factor using open-loop calibration techniques  
Several open-loop calibration techniques for phase-locked-loop circuits (PLL) that provide a process, temperature and divider modulus independence for the loop bandwidth and damping factor are...
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...
7064621 Synchronous clock generation circuit capable of ensuring wide lock-in range and attaining lower jitter  
At a first step, in a synchronous clock generation circuit, the number of delay stages serving as a digital PLL circuit is increased/decreased, and an oscillation circuit performs an oscillation...
7058528 Automated optimization of asymmetric waveform generator LC tuning electronics  
Disclosed is method of controlling an asymmetric waveform generator including the steps of providing a reference timer signal, and generating an asymmetric waveform as a combination of a first...
7012472 Digital control loop to improve phase noise performance and RX/TX linearity  
A system or method for controlling a voltage controlled oscillator (VCO) or LO buffer includes an amplitude detector for detecting an amplitude value at a node corresponding to the at least one...
6999020 Semiconductor integrated circuit  
A frequency detecting circuit 10 detects frequency of a sampling pulse SP, and outputs the detected frequency as a detection value VOUT. A current adjusting circuit 20 adjusts a power supply...
6975176 Self-tuning varactor system  
In one embodiment, the present invention provides a system including a varactor and a voltage generator. The varactor includes a set of substantially equal voltage-tunable capacitor cells, each...
6972631 Rubidium frequency standard control method and system for voltage-controlled oscillators  
A rubidium frequency standard control circuit which utilizes an initial sweep hand-off frequency locking process followed by a negative feedback loop for optimization of the stability of the...
6949980 Phase-locked loop with high frequency adjustment of the operating range of the oscillator  
A phase-locked loop including an oscillator, controlled by a control signal generated by a comparison circuit comparing a reference frequency and the oscillator frequency and filtered by an...
6822519 Synthesizer structures and alignment methods that facilitate quadrature demodulation  
Synthesizer structures and alignment methods are provided that facilitate quadrature demodulation. The structures are realized with phase-locked loops that include half-rate frequency dividers to...
6806782 Frequency synthesizer circuit  
The frequency synthesizer circuit includes a phase-locked loop (PLL) circuit, a voltage controlled oscillator (VCO), a low pass filter (LPF), an input terminal for providing serial data provided...
6795517 Low power phase locked loop frequency synthesizer  
A phase locked loop frequency (PLL) synthesizer in which the scaled output of a reference oscillator( 24 ) is compared with the scaled output of a voltage controlled oscillator(VCO)( 10 ) in a...
6791421 Input-switching voltage-controlled oscillator and PLL-controlled oscillator  
A PLL-controlled oscillator that can be suitably used for such purposes as a jitter filter in an optical transmission system includes an input voltage-switching control oscillator as a...
6778022 VCO with high-Q switching capacitor bank  
Circuits and methods for tuning voltage-controlled oscillators. A control voltage is applied through an isolation resistor to a varactor. The varactor capacitance is AC coupled through a second...
6774732 System and method for coarse tuning a phase locked loop (PLL) synthesizer using 2-PI slip detection  
A system for coarsely tuning at least one voltage controlled oscillator (VCO) ( 211 ) in a phase locked loop (PLL) synthesizer ( 200 ) that includes a phase-frequency detector (PFD) for determining...
6734738 Low power timer circuit having stable output frequency  
A timer circuit having an oscillator circuit that has low power consumption and a stable frequency of the output signal. Timer circuit 10 has highly stable oscillator 21, counter 22 and...
6734740 Enhanced ZDB feedback methodology utilizing binary weighted techniques  
An apparatus comprising a first circuit and a second circuit. The first circuit may be configured to present a plurality of output clock signals and a first control signal in response to a...
6707342 Multiple-VCO tuning  
A tuning circuit for use in tuning multiple voltage-controlled oscillators (VCOs) of a phase-locked loop (PLL) is provided. A search algorithm is used to determine which VCO to use for a given...
6677824 Changing the output frequency of a phase-locked loop  
A phase-locked loop (PLL) 1 is provided with means for changing the frequency of the output signal to a desired frequency. The PLL 1 is operated during a first period with a feedback frequency...
6664828 Post-silicon control of phase locked loop charge pump current  
A post-silicon technique for adjusting a current of a charge pump in a phase locked loop is provided. The technique involves use of an adjustment circuit operatively connected to the charge pump,...
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