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8183934 PLL circuit and voltage-controlled oscillator  
In a PLL circuit, a threshold discriminator generates a control signal indicating a relative level of a control voltage. A controller outputs a controlling value based on the control signal. If the...
8154351 Voltage-controlled oscillator and gain calibration technique for two-point modulation in a phase-locked loop  
A VCO in a phase-locked loop (PLL) is arranged to receive low-pass data via a first input and high-pass data at a second input. The first input is coupled to a first set of varactors in the VCO....
8134392 Phase locked loop  
A phase locked loop (PLL) which has a desired frequency characteristic even though a manufacturing process of a semiconductor integrated circuit has fluctuations. The semiconductor integrated...
8085099 Self-calibrating relaxation oscillator based clock source  
A technique and corresponding circuitry are presented for a process independent, self-calibrating relaxation based clock source. The technique and circuitry presented here can reduce the time and...
8081034 Frequency synthesizer for integrated circuit radios  
An integrated circuit radio transceiver and method therefor includes capacitive loop filter with selectable capacitive elements that are operable to adjust a signal level provided to a voltage...
8063708 Phase locked loop and method for operating the same  
A phase locked loop can reduce a locking time, thereby efficiently reducing power in a locking operation. The phase locked loop includes a phase detector, a control voltage generator, a voltage...
8044722 Oscillation frequency control circuit  
To provide a highly stable oscillation frequency control circuit wherein the frequency thereof is corrected, an adequate range of the input levels of external reference signals is determined in...
8027423 Synchronizing apparatus, synchronizing method, synchronizing program and data reproduction apparatus  
A synchronizing apparatus, which controls, by a PLL circuit, a sampling clock to be used to sample input data and synchronizes a phase of the sampling clock with a target phase that is desirable...
8022782 Two-point phase modulator and method of calibrating conversion gain of the same  
A two-point phase modulator and a method of calibrating conversion gain of the same are provided. The two-point phase modulator locks an output frequency signal by charging and pumping charge in a...
7999625 Method and apparatus for calibrating oscillators  
A method of calibrating oscillators is disclosed that includes searching, in an array storing an operational characteristic of the oscillator, for an index value that is associated with an output...
7990224 Dual reference phase tracking phase-locked loop  
A phase-locked loop circuit having a dual-reference input and a phase detector. The dual-reference input is configured to accept both a rising edge of an input clock having a first phase and a...
7973608 Phase locked loop, semiconductor device, and wireless tag  
An object is to provide a PLL having a wide operating range. Another object is to provide a semiconductor device or a wireless tag which has a wide operating range in a communication distance or...
7948326 Method for carrying out a frequency change  
The invention relates to a method for carrying out a frequency change whilst retaining the phase relationship between several devices, in particular, network analyzers. Each device has at least one...
7915962 System and method for built in self test for timing module holdover  
Embodiments of the invention include a method for use in a device having a local oscillator. The method includes performing, for the local oscillator that is disciplined by an external reference...
7893773 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...
7888984 Intermittent operation circuit and modulation device  
There is provided a small-size, low-power-consumption intermittent operation circuit capable of obtaining an output waveform having a rapid rise and fall. The intermittent operation circuit...
7872535 Phase locked loop with capacitive loop filter  
An integrated circuit radio transceiver and method therefor includes capacitive loop filter with selectable capacitive elements that are operable to adjust a signal level provided to a voltage...
7839222 Systems and methods using programmable fixed frequency digitally controlled oscillators for multirate low jitter frequency synthesis  
The disclosure provides systems and methods for programmable fixed frequency digitally controlled oscillators for multirate low jitter frequency synthesis. The present invention utilizes a digital...
7839220 Phase-locked loop runaway detector  
In a circuit having a runaway detector coupled to a phase-locked loop (PLL), the PLL may include a loop filter to receive a control voltage within the PLL and provide a filtered control voltage and...
7826519 Method and apparatus for providing coherent phase noise in transceivers or similar systems  
A method and circuit for providing coherent phase noise including a clock receiver to receive a clock signal generated external to the circuit and a local clock source arranged on the circuit. The...
7808410 Current control circuit  
Provided is a current control circuit. A current control circuit may include a clock sensing unit configured to generate a control signal according to one or more frequencies based on a plurality...
7801262 All digital phase locked loop architecture for low power cellular applications  
A novel mechanism that is operative to observe and compare the differentiated phase of the reference and variable PLL loop signals using a frequency detector. The resultant phase differentiated...
7772928 Arrangement for phase synchronization according to the master/slave principle  
An apparatus for the phase synchronization of several devices, wherein one device is the master device and the other devices are slave devices, with a phase synchronization unit for every device,...
7755439 Phase locked loop circuit performing two point modulation and gain calibration method thereof  
A PLL circuit for two point modulation includes a first loop filter, a second loop filter, a plurality of switching devices, and a calibration module. The first loop filter filters an output...
7755436 PLL apparatus  
Provided is a PLL apparatus outputting a frequency signal from a voltage-controlled oscillation unit in synchronization with an external reference frequency signal, in which the fluctuation of the...
7737792 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...
7724093 Phase locked loop with two-step control  
A phase locked loop has a digitally controlled oscillator (DCO) for generating a DCO output signal (fOSC), a clock divider coupled to the DCO and receiving the DCO output signal and outputting a...
7692499 Digitally compensated highly stable holdover clock generation techniques using adaptive filtering  
A system and method for generating a highly stable holdover clock utilizing an integrated circuit and an external OCXO is presented. The integrated circuit comprises an input reference clock...
7675335 Phase detecting module and related phase detecting method  
A phase detecting module includes a phase detecting unit, a comparator and a counter. The phase detecting unit is arranged to compare a first input signal and a second input signal to generate a...
7667545 Automatic calibration lock loop circuit and method having improved lock time  
A lock loop circuit (216) includes a precharge circuit (304), an oscillator circuit (306), and a calibration circuit (309). The calibration circuit includes at least one register (362). The...
7656206 Phase-locked loop circuit  
A voltage controlled oscillator 8 is configured to include a plurality of variable delay circuits 30 that are connected to one another so as to form a ring. Output fixing units 31 each of which...
7642863 Systems and methods for PLL linearity measurement, PLL output duty cycle measurement and duty cycle correction  
Systems and methods for enabling the determination of voltage controlled oscillator (VCO) linearity, duty cycle determination and duty cycle correction in phase locked loop circuits (PLL's.) One...
7642869 Clock generator  
A clock generator includes a ring oscillator for outputting a basic signal, a divide-by-N frequency divider for dividing the basic signal by a division ratio N to generate a clock signal having a...
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) coupled...
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...
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