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8183936 Phase-locked loop frequency synthesizer and loop locking method thereof  
A phase-locked loop frequency synthesizer and a loop locking method thereof are provided. The phase-locked loop frequency synthesizer includes a reference route sigma-delta modulator feedback...
8183949 Compensation of VCO gain curve offsets using auto-calibration  
A method is provided for selecting an operating band of a voltage-controlled oscillator (“VCO”) of a phase locked loop (“PLL”) for which the lock frequency is closest to a center of the frequen...
8183950 Auto-calibration for ring oscillator VCO  
A phase locked loop (“PLL”) includes a voltage controlled oscillator (“VCO”) operable to acquire and maintain lock at a selected output frequency of the VCO and control logic operable to perform...
8183947 Low power consuming quartz oscillator circuit with active polarisation  
The quartz oscillator circuit includes an inverter comprising two complementary PMOS and NMOS transistors (P1, N1) series-mounted with a current source (4) between two terminals of a supply voltage...
8174332 Phase lock loop pre-charging system and method  
A phase lock loop pre-charging system and method are described. In one embodiment, a phase lock loop pre-charge system includes a bias component for generating a pre-charge voltage, and an...
8169265 Phase lock loop circuits  
A phase lock loop circuit is provided. A phase frequency detector detects a phase difference between a feedback signal and a reference signal, and generates a phase error signal in response to the...
8166318 Power circuit  
A power circuit includes a memory power circuit and a central processing unit (CPU) power circuit. The memory power circuit includes a first operational amplifier and a first switch. The CPU power...
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....
8149065 Low KVCO phase-locked loop with large frequency drift handling capability  
A phase-locked loop that supports a large frequency drift capability, yet maintains a low Kvco, and does not introduce noise or discontinuities in the frequency of the generated phase-locked loop...
8145935 Clock signal generator for generating stable clock signal, semiconductor memory device including the same, and methods of operating  
A clock signal generator can include a clock signal generation unit that is configured to generate a clock signal. A clock signal control unit is configured to count a number of pulses of the clock...
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...
8130047 Open loop coarse tuning for a PLL  
In many types of wireless applications (like wireless modems), it is important that the phase locked loops (PLLs) be able to synthesize clock frequencies in a wide tuning range. Because of the...
8125254 Techniques for configuring multi-path feedback loops  
In some embodiments, a feedback loop circuit includes a phase detector, first and second charge pumps that are each coupled to receive an output signal of the phase detector, a first low pass...
8121242 Frequency lock stability in device using overlapping VCO bands  
A system and method are provided for frequency lock stability in a receiver using overlapping voltage controlled oscillator (VCO) bands. An input communication signal is accepted and an initial VCO...
8120431 Variable loop bandwidth phase locked loop  
An apparatus comprising a voltage controlled oscillator, a first charge pump, a second charge pump, a switch circuit and a comparator circuit. The voltage controlled oscillator may be configured to...
8120430 Stable VCO operation in absence of clock signal  
A semiconductor device having a phase-locked loop (“PLL”) (100) drives a VCO (114) of the PLL circuit with a first control voltage (VCTRL) produced by a loop filter (112) when a first clock sig...
8120436 System and method for implementing an oscillator  
In one embodiment, a system for generating an oscillating signal includes a transconductance amplifier comprising a single-ended output and a differential input. The system also includes only one...
8120400 Phase locked loop circuit  
A Phase Locked Loop circuit, includes: a main path through which an input signal is propagated, and an actual signal is output; a main feedback path through which the actual signal is fed back to...
8115559 Oscillator for providing a constant oscillation signal, and a signal processing device including the oscillator  
An oscillator including a current bias circuit and a ring oscillator. The current bias circuit tracks a temperature change of the oscillator by using a control voltage and generates a plurality of...
8111107 Charge pump control scheme  
An integrated circuit includes a charge pump having a voltage output. A voltage level detector is arranged to receive the voltage output, wherein the voltage level detector provides a first enable...
8102215 Compensated high-speed PLL circuit  
The invention relates to a compensation method and phase-locked loop (PLL) circuit, wherein different kinds of two-point modulations are used and the integral regulator of a loop filter is replaced...
8098104 Estimation and compensation of oscillator nonlinearities  
A device may include an oscillator circuit, a control circuit, a frequency detector circuit, and a processor circuit. The oscillator circuit may include a frequency control input to output an...
8098103 PLL disturbance cancellation  
Techniques for cancelling a disturbance signal from a PLL output signal. In an aspect, a cancellation signal is combined with the signal input to a VCO or DCO in the PLL. In a further aspect, the...
8094754 Frequency hold mechanism in a clock and data recovery device  
A system and method are provided for holding the frequency of a non-synchronous communication signal in a clock and data recovery (CDR) device frequency synthesizer. The method initially acquires...
8089317 Phase-locked loop circuit, recording-and-reproducing apparatus, and electronic apparatus  
A phase-locked loop circuit includes a phase detection unit, a loop filter unit including a series circuit of a resistor and a capacitor, first and second pulse-current output units which supply...
8090335 Method and apparatus for an adaptive step frequency calibration  
An open loop frequency calibration algorithm is employed whereby frequency counters are utilized to provide frequency information concerning the difference in frequency between a local oscillator...
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...
8085098 PLL circuit  
A PLL circuit comprising an oscillation unit, a frequency division unit, a phase comparison unit, and a generation unit comprises a switching unit that switches between a first state in which a...
8085101 Spread spectrum clock generation device  
A spread spectrum controller (20) controls a PLL (10) so that the PLL outputs a spread-spectrum processed clock signal. A loop bandwidth controller (30) controls at least one of a phase detector...
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...
8076979 Lock detection circuit for phase locked loop  
A lock detector circuit for detecting a lock condition between a reference signal and a feedback signal includes a first counter for outputting a first counter value indicative of a number of clock...
8076977 Device having digitally controlled oscillator  
A device includes a digitally controlled oscillator and an interpolator having a data input and a data output coupled to the digitally controlled oscillator. The interpolator may be configured to...
8076978 Circuit with noise shaper  
In an embodiment, a circuit comprising an oscillator is provided. The oscillator is controlled based on a feedback value and an input reference value. The feedback value or the reference value or...
8067988 Low jitter and wide-range frequency synthesizer for low voltage operation  
A low jitter and wide-range frequency synthesizer for low voltage operation includes a detector to generate a detection signal based on a logic level difference between an input signal and a...
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...
8063707 Phase locked loop  
Phase locked loop circuits capable of increasing an equivalent capacitance thereof to improve stability are provided, in which an integral part comprises a first phase frequency detector providing...
8063697 Self-oscillating driver circuit  
A self-oscillating driver circuit comprises a driver stage, a feedforward path which is coupled to an input of the driver stage, and a feedback path which couples an output of the driver stage to...
8054137 Method and apparatus for integrating a FLL loop filter in polar transmitters  
The invention relates to a method and apparatus for integrating the various circuit components controlling a voltage-controlled oscillator (“VCO”) on an integrated circuit formed on a sem...
8049568 Feedback-based linearization of voltage controlled oscillator  
Embodiments of the present invention enable a feedback-based VCO linearization technique. Embodiments include a frequency locked loop formed by feeding back a VCO's output into the VCO's input in...
8049533 Receiver and method for dynamically adjusting sensitivity of receiver  
A receiver and a method for dynamically adjusting sensitivity of the receiver are provided. The receiver includes a detection unit and a receiving unit. The detection unit detects an input signal...
8045937 Digital phase feedback for determining phase distortion  
A feedback loop is used to determine phase distortion created in a signal by directly extracting the phase distortion information from a feedback signal using original frequency modulation...
8044723 Oscillator signal generation with spur mitigation in a wireless communication device  
Techniques for generating oscillator signals in a wireless communication device are described. A phase-locked loop (PLL) may be used to generate an oscillator signal for a selected frequency...
8044729 Phase locked loop and voltage controlled oscillator thereof  
A phase locked loop (PLL) and a voltage controlled oscillator (VCO) thereof are provided. The VCO includes a ring oscillator circuit and a control circuit. The ring oscillator circuit is used for...
8044724 Low jitter large frequency tuning LC PLL for multi-speed clocking applications  
The subject innovation relates to systems and/or methodologies for generating a low jitter large frequency tuning LC-based phase-locked loop circuit for multi-speed clocking applications. In...
8044725 Signal generator with directly-extractable DDS signal source  
A signal generator including a DDS-signal source that is configured to operate according to the principle of direct digital synthesis (DDS), and a PLL signal synthesizer that is configured to...
8040192 Power supply voltage output circuit  
A power supply voltage output circuit includes: a power supply voltage generation unit generating a power supply voltage to be supplied into a ring oscillator; a reference clock oscillator...
8040191 PLL circuit with VCO gain control  
A PLL circuit includes first and second charge pump circuits controlling an output voltage according to an output signal of a phase comparator, a first filter filtering out predetermined frequency...
8036318 Clock and data recovery circuit  
The phase detector compares the phases of a synchronous clock signal and serial data and outputs a phase error signal corresponding to a comparison result. The second integrator performs...
8031027 Voltage-controlled oscillator, phase-locked loop (PLL) circuit, and clock generator  
A voltage-controlled oscillator includes a voltage regulator, and a delay unit. The voltage regulator independently receives a first oscillation control signal and a second oscillation control...
8031009 Frequency calibration loop circuit  
A frequency calibration loop circuit having a pre-set frequency channel word (FCW) command value, a bit inputted to obtain a target frequency in an oscillator and a pre-set minimum division ratio n...
Matches 1 - 50 out of 1966 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >