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6819197 Multiple bandwidth phase lock filters for multimode radios  
An apparatus and method for filtering a signal in a phase lock loop is disclosed. An typical apparatus for filtering a phase error signal comprises a first filter subcircuit receiving a phase error...
6819186 Electrical circuit arrangement, phase locked loop and method for operating an oscillator  
A method is provided for operating a voltage controlled oscillator, particularly in a portable communications appliance, when the oscillator is supplied with a variable control voltage, which is...
6819188 Phase-locked loop oscillator with loop gain compensation  
A phase-locked loop oscillator with loop gain compensation. The phase-locked loop oscillator includes a phase comparator, a loop filter, a voltage-controlled oscillator, a control device, and a...
6816019 Automatically calibrated phase locked loop system and associated methods  
A method for automatically calibrating a phase locked loop (PLL) system includes estimating a frequency value of an input signal applied to the system. Based on the estimated frequency value, a...
6812797 Phase-locked loop with loop select signal based switching between frequency detection and phase detection  
A phase-locked loop (PLL) includes at least first and second loops, and loop selection circuitry coupled to the first and second loops, the loop selection circuitry being responsive to at least one...
6809600 Dual loop phase lock loops using dual voltage supply regulators  
Dual loop phase lock loops having a high loop bandwidth with low power consumption are described. Each loop is provided with a voltage supply regulator circuit which regulates the voltage of a...
6809598 Hybrid of predictive and closed-loop phase-domain digital PLL architecture  
A phase-domain digital PLL loop is implemented using a hybrid of predictive and closed-loop architecture that allows direct DCO oscillator transmit modulation in the GFSK modulation scheme of...
6809599 Phase locked loop circuit having automatic adjustment for free-running frequency of voltage controlled oscillator  
In a phase locked loop (PLL) circuit having a function of automatically adjusting the free-running frequency of a voltage controlled oscillator (VCO), the number of pulses of a pulse signal output...
6806780 Efficient modulation compensation of sigma delta fractional phase locked loop  
A technique is provided for achieving efficient modulation compensation of a ΣΔ fractional PLL. The parameters of the PLL TF are the gain, K pll , of the PLL and the time constants associated...
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...
6803828 Lock detector for phase locked loops  
A detector circuit for determining whether synchronization lock has been optimally achieved in feedback-type control systems. The detector circuit evaluates an error signal developed by a...
6803831 Current starved inverter ring oscillator having an in-phase signal transmitter with a sub-threshold current control unit  
A ring oscillator according to the present invention comprises: a ring oscillation unit, including a current starved inverter CSI having a current control P channel transistor P 2 , a signal...
6803753 Frequency phase detector for differentiating frequencies having small phase differences  
The invention provides a structure, method and apparatus for receiving a reference frequency and a variable frequency, differentiating the frequencies, and generating a logic pulse in response to a...
6803827 Frequency acquisition system  
A frequency acquisition system for a tunable oscillator is provided that generally includes a frequency-locked loop circuit including a detector system, responsive to the frequency of an output...
6798299 Crystal-less oscillator circuit with trimmable analog current control for increased stability  
A crystal-less oscillator circuit with trimmable current control. In one embodiment, the present invention provides an oscillator circuit comprising a digital to analog converter circuit for...
6798297 Method and apparatus for converging a control loop  
In one embodiment, a control loop in an electrical circuit includes a variable feed-forward circuit configured to determine a setting of a variable oscillator that would result in a frequency of a...
6794944 Lock detection circuit  
There is provided a lock detection circuit for optimizing a lock detection time and an unlock detection time of a PLL circuit. The present invention has counters 21 and 22 for inputting and...
6794946 Frequency acquisition for data recovery loops  
A frequency monitor includes an edge detector which produces a pulse for each rising or falling edge of an error signal. The error signal itself has a frequency that is responsive to a difference...
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...
6791381 Method and apparatus for reducing the lock time of a DLL  
A delay locked loop having improved synchronization times has a variably adjustable delay line which accepts two incoming clock pulses. As each pulse propagates through the delay line an edge of...
6788154 Phase-locked loop with composite feedback signal formed from phase-shifted variants of output signal  
A phase-locked loop system and method are provided. The system may include an error detector configured to receive a reference signal, and a voltage-controlled oscillator subsystem coupled to the...
6784755 Compact, high power supply rejection ratio, low power semiconductor digitally controlled oscillator architecture  
A high PSRR, low power semiconductor digitally controlled oscillator (DCO) architecture employs only one simple current steering D/A converter directly on top of a multi-stage current controlled...
6784752 Post-silicon phase offset control of phase locked loop input receiver  
A phase locked loop that includes a receiver that is adjustable to substantially match delay of a system clock and a feedback clock at an input of the phase locked loop is provided. The receiver...
6781469 Phase-locked loop having phase detector error signal reshaping and method thereof  
A phase-locked loop includes a signal reshaper connected between a phase detector and a charge pump. The signal reshaper can be controlled by a controller to reshape the phase error signal based on...
6778024 Dynamically trimmed voltage controlled oscillator  
A system for dynamically trimming a voltage controlled oscillator operable to receive a trim signal for adjusting a voltage-to-frequency operating characteristic of the voltage controlled...
6778026 High-speed phase frequency detection module  
A high-speed phase-frequency detection module is described to function at very high frequencies and to produce very low jitter. In one embodiment, high-speed phase-frequency detection module...
6778028 Temperature-compensated radio-frequency oscillator and communication device  
By supplying a control voltage that corresponds to the phase difference between an output signal of a temperature-compensated crystal oscillator (TCXO 1 ) and a signal obtained by dividing an...
6778027 Phase locked loop input receiver design with delay matching feature  
A phase locked loop that includes a receiver circuit for matching delays of a system clock and a feedback clock at an input of the phase locked loop is provided. The receiver circuit employs system...
6774730 Power rails glitch noise insensitive charge pump  
A the charge pump suitable for use in phase-locked loop (PLL) circuits employed by mixed signal integrated circuits (IC) is disclosed. The PLL charge pump includes a constant current source that...
6774738 Trimming method for a transceiver using two-point modulation  
In a method for amplitude trimming in transceivers having a PLL circuit operating on the two-point modulation principle, the amplitude of an analog modulation signal is selected on the basis of a...
6774731 Method and circuit for minimizing glitches in phase-locked loops  
A method and a circuit for minimizing glitches in phase-locked loops is presented. The circuit includes an input terminal connected to an input of a phase detector; a series of a charge pump...
6771133 Phase-locked oscillator with improved digital integrator  
Phase-locked oscillators ( 74, 152, 172 , or 196 ) include both a digital integrator ( 82 or 146 ) and a digital lead compensator ( 84, 148 , or 180 ), and use either analog ( 108 ) or digital...
6765977 Offset mode phase locked loop frequency synthesizer with reduced divide ratio  
A phase locked loop (PLL) frequency synthesizer includes a voltage controlled oscillator (VCO) to provide a VCO frequency signal, a frequency offset circuit including a mixer accepting the VCO...
6765446 Frequency lock loop having a reloadable counter without rollover  
A frequency lock loop has a reloadable N counter that counts cycles of an output frequency during one cycle of a reference frequency. A VCO generates the output frequency. A VCO control drives the...
6765444 Cross clocked lock detector circuit for phase locked loop  
A method and a lock detector circuit for phase-locked loop for detecting lock between reference signal and a feedback signal in two phases: lock detection phase and lock assertion phase. The...
6765445 Digitally-synthesized loop filter circuit particularly useful for a phase locked loop  
In a feedback system such as a PLL, the integrating function associated with a loop filter capacitor is instead implemented digitally and is easily implemented on the same integrated circuit die as...
6766154 Fast settling fine stepping phase locked loops  
Fast switching and fast settling is achieved in a phase locked loop (“PLL”) containing a bandwidth switched active loop filter ( 8 ) by feeding the phase error signal of the phase detector ( 1...
6762648 Device and method for production of a clock signal  
A device and method for production of a signal of constant frequency are disclosed. Said device comprises an integrator and an adjustable oscillator. Said integrator is for integration of an input...
6759912 Phase locked loop  
A phase-locked loop comprises a phase detector receiving an externally supplied reference signal and a feedback signal, a charge pump connected to an output of the phase detector, a loop filter...
6756828 Phase lock loop (PLL) apparatus and method  
A phase lock loop (PLL) and methods for using same is provided that includes a multiple-feedback CMOS voltage control oscillator (VCO) and multi-phase sampling fractional-N prescaler. The PLL...
6753740 Method and apparatus for calibration of a post-fabrication bias voltage tuning feature for self biasing phase locked loop  
A calibration and adjustment system for post-fabrication control of a phase locked loop bias-generator is provided. The calibration and adjustment system includes an adjustment circuit operatively...
6747521 Analog memory cell in a low power oscillator  
An analog memory cell that may be incorporated into a low power oscillator is provided. The analog memory cell stores an analog voltage as a digital signal and converts the digital signal back to...
6747519 Phase-locked loop with automatic frequency tuning  
A PLL frequency synthesizer able to automatically set an appropriate operating mode of the voltage controlled oscillator is provided. The voltage controlled oscillator is operable in a plurality of...
6734739 Fractional-frequency-modulation PLL synthesizer that suppresses spurious signals  
The phase comparator in a phase locked loop synthesizer has a identical first and second transmission gates connected to a front row and a back row of 2N−1 gate delay elements, respectively....
6727768 Relaxation CCO for PLL-based constant tuning of GM-C filters  
A relaxation current controlled oscillator (CCO) is provided by forming an integrator out of a transconductance amplifier and a capacitor. The output of the integrator is fed to comparators which...
6727763 PLL synthesizer in a cellular phone  
A cellular phone has consecutively a receiving slot, an idling slot which is either a waiting slot or a peripheral information receiving slot, and a transmitting slot in a single frame. The PLL...
6724264 Controller for a device with change in characteristics  
A device characteristic changing apparatus is provided for changing a characteristic of a device. The device characteristic changing apparatus comprises a time scale generator unit for generating a...
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...
6714083 Lock detector and phase locked loop circuit  
There are provided a lock detector that does not output a lock detecting signal of incorrect content even when approaching phase synchronization, when an input signal stops suddenly, or when a...
6714085 Prepositioned frequency synthesizer and method therefor  
A PLL-type frequency synthesizer ( 10 ) in which a loop filter ( 24 ) state is recorded during an earlier hop to a given frequency then assigned back to the loop filter ( 24 ) during a subsequent...
Matches 351 - 400 out of 1784 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >