Matches 601 - 650 out of 1561 < 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 >
Match Document Document Title
5751195 Circuit to indicate phase lock in a multimode phase lock loop with anti-jamming security  
A lock detection circuit for a phase lock loop circuit having a phase lock loop circuit, generally a series circuit of a detector, a filter and a VCO with a PLL input terminal and an output...
5748043 Digital PLL frequency synthesizer  
A digital frequency synthesizer includes a digital-to-analog (1), a low pass filter (2), and a controllable oscillator (3), where the oscillator output is the synthesizer output. K number of RS...
5745004 FPLL with third multiplier in an AC path in the FPLL  
A FPLL has first second and third multipliers with the first multiplier supplying demodulated signals to a limiter and the second multiplier supplying signals to the loop filter. A VCO and phase...
5742191 D/A for controlling an oscillator in a phase locked loop  
A phase-lock-loop circuit includes a digital-to-analog converter of the bit rate multiplier type. The input word to the converter is updated once each horizontal period of a television signal....
5740411 Controllably switched phase locked loop circuits, systems, and methods  
Circuits, systems, and methods, relating to a controllably switched phase locked loop. The system indudes a phase locked loop circuit (16) having a clock signal input (16c), a clock signal lock...
5734301 Dual phase-locked loop clock synthesizer  
A dual phase-locked loop (PLL) clock synthesizer is disclosed for generating clock signal in synchronization with the data input signal received over a network environment. The dual PLL clock...
5729179 Variable Frequency Divider  
In a variable frequency divider capable of N+1/2 frequency division, a programmable frequency divider alternately frequency-divides an input signal by a frequency division ratio N (N being an...
5727030 Automatic frequency control circuit applicable to a mobile communication system  
An automatic frequency control circuit comprises an quadrature demodulation unit for creating an in-phase signal and an antiphase signal by quadrature-demodulating a Gaussian Minimum Shiftkeying...
5724007 Adjustable lock detector for a phase-locked loop circuit  
A lock detector suitable for detecting when an output signal of a phase-locked loop circuit is phase-locked to an input reference signal. The lock detector includes a pair of delay lines, that are...
5719508 Loss of lock detector for master timing generator  
A digital loss of lock detection (LLD) device for a phase looked loop (PLL) generates a locked frequency signal synchronized with a reference frequency signal. The LLD comprises first to fifth...
5719532 Horizontal lock detector  
A horizontal lock detector circuit monitors charge pump control signals within a horizontal phase-lock loop to determine when the sampling pulses generated by the video system are locked in phase...
5710526 Phase-locked loop for signals having rectangular waveforms  
Phase-locked loop (for signals having rectangular waveforms, comprising, in series, a phase detector, a control signal generator circuit having a loop filter, a controlled oscillator and an...
5710524 Clock synthesizer for low EMI applications  
The object of the present invention is to provide a clock synthesizer IC which can produce clock signals with much lower radiated EMI. The clock synthesizer IC comprises: a forward programmable...
5703537 Phase-locked loop clock circuit for generation of audio sampling clock signals from video reference signals  
A circuit with a phase-locked loop circuit which generates audio clock signals with zero ppm error from reference clock signals at a reference frequency is presented. The phase-locked loop (PLL)...
5699020 Phase latched differential charge pump circuit and method  
A loop circuit such as a delay lock loop or a phase lock loop includes circuitry for changing the strength of the lock after lock has been achieved. Before lock is achieved, the strength of the...
5694088 Phase locked loop with improved phase-frequency detection  
A phase locked loop including an in-phase detector (IPD), a quadrature phase detector (QPD), a frequency detector (FD), a squelch, a filter, and a voltage controlled oscillator (VCO). The in-phase...
5694086 Precision, analog CMOS one-shot and phase locked loop including the same  
A precision CMOS one-shot having a delay proportional to a bias voltage. The bias voltage is generated by a phase locked loop which produces a bias voltage to control a voltage controlled...
5694068 Digital phase-locked loop (PLL) having multilevel phase comparators  
Using positive-phase or negative-phase clocks of phase count clock Pf 0 , a number M of multilevel quantized phase comparators output as values quantized in multiple levels the phase differences of...
5686864 Method and apparatus for controlling a voltage controlled oscillator tuning range in a frequency synthesizer  
A frequency synthesizer (100, 500) provides multiple selectable voltage controlled oscillator (VCO) frequency ranges. A VCO control circuit (114) controls the selectable VCO frequency ranges based...
5686865 Phase synchronous circuit  
A novel phase synchronous circuit includes a phase comparator, a first loop filter being electrically connected to the multiplying phase comparator, a second loop filter being electrically...
5684795 Method and apparatus for controlling a fractional-N synthesizer in a time division multiple access system  
In a Time Division Multiple Access System, multiple offset values are provided to a divider control circuit (213) of a fractional-N synthesizer (200) by utilizing a microprocessor (305). The...
5677648 Noise compensated phase locked loop circuit  
An improved phase locked loop utilizing control logic generated by a phase detector to eliminate sensitivity to uncorrelated noise when the loop is in lock.
5673004 Method and circuit for controlling digital processing phase-locked loop for network synchronization  
The present invention discloses a control algorithm of digital processing-phase locked loop(DP-PLL) for network synchronization to prevent phase-hit generated at the time of transition of the...
5670913 Phase locked loop circuit with false locking detector and a lock acquisition sweep  
Based on a phase locked loop (PC1, CP1, VCXO) which receives an incoming data signal (DS) and generates a recovered clock signal (RC), in the event that this incoming data signal (DS) includes low...
5668503 System and method for calibrating damping factor or analog PLL  
Calibration systems and techniques for analog phase-lock loops (PLLs) providing the capability to dynamically maintain a constant damping factor. Damping factor is calibrated by automatically...
5668504 Frequency synthesizer  
A frequency synthesizer including a phase-locked loop, an oscillator of which supplies n phases with increasing delays of a fast clock signal synchronized on a reference frequency, each of said n...
5663687 LSI with built-in clock generator-controller for operation with low power dissipation  
The invention provides an LSI with a built-in clock generator-controller which minimizes power dissipation of an entire system and reduces production of a skew between an external system clock...
5663685 Dual flip-flop detector type phase locked loop incorporating dynamic phase offset correction  
Compensation circuits are disclosed for correcting phase offset during apparent phase lock of a dual flip-flop phase detector type of phase locked loop, which phase offset is due to circuit delays...
5663688 Method of enhancing the noise immunity of a phase-locked loop, and device implementing this method  
The present invention relates to a method of enhancing the noise Immunity of a phase-locked loop. The phase-locked loop includes a comparator and apparatus for inhibiting the action of the...
5661425 Digital PLL circuit  
A phase control circuit adjusts the width of a PLL clock signal so that a PLL clock signal generated from a master clock signal MCK is in synchronization with an EFM signal. A velocity detector...
5654674 Oscillator control circuit with phase detection feedback  
A controllable crystal oscillator of a receiver having a mixer producing an IF signal is controlled by a feedback loop that includes a phase detector. The IF signal is delayed by an odd multiple of...
5642082 Loop filter level detection circuit and method  
A loop circuit such as a delay lock loop or a phase lock loop includes circuitry for detecting when the output signal of the low-pass filter in the loop has either risen to a voltage which is...
5640116 PLL circuit of pulse swallow-type prescaler system  
A PLL circuit of the pulse swallow-type prescaler system prevents erroneous module count operations such as are caused by a delay in the module signal, without the need to use a device which...
5638019 Accurately generating precisely skewed clock signals  
Systems and methods for accurately skewing periodic signals using a matching pair of voltage controlled delay lines, a frequency comparator, and a common control signal to the delay lines as...
5635875 PLL circuit with improved stability  
A PLL circuit detects a phase difference between a signal relating to an output of a voltage control oscillator and a reference signal, and discrimination between a phase lead and a phase lag,...
5633899 Phase locked loop for high speed data capture of a serial data stream  
A phase locked loop locks on to the phase of a high speed serial data stream. The phase locked loop includes a multiple bit latch, a multiple-stage voltage controlled oscillator, a phase detection...
5627496 PLL and phase detection circuit therefor  
There is disclosed an integrated circuit including a phase detection circuit having an exclusive gate having first and second gate inputs for receiving first and second gate input signals. The...
5619170 PLL timing generator with voltage controlled oscillator  
A phase lock loop timing generator including a voltage controlled oscillator as a current-limited ring oscillator composed of multistage inverters connected in series in a ring form using a phase...
5619154 Numerical voltage controlled oscillator  
A numerical voltage controlled oscillator comprising an integrator for generating an estimated sine waveform and an estimated cosine waveform from a variable control signal; a normalizer, connected...
5619171 Phase-locked loop, phase comparator for use in the phase-locked loop, and reproducing device including the phase-locked loop  
A phase-locked loop includes an input terminal (1) for receiving a binary signal, a phase comparator (3) having a first input (2) coupled to the input terminal (1), having a second input (4), and...
5614868 Phase locked loop having voltage controlled oscillator utilizing combinational logic  
A phase locked loop including a VCO having a multi-stage oscillator portion and a combinational logic portion. The multi-stage oscillator portion is configured to oscillate at a VCO clock frequency...
5614869 High speed divider for phase-locked loops  
A high speed divider circuit is provided for phase-locked loops (PLLs). The divider circuit in the feedback loop of the PLL has two divider circuits, a prescalar divide-by-4 circuit, which receives...
5614870 Phase lock loop with idle mode of operation during vertical blanking  
A frequency detector of a phase-lock-loop circuit is used for measuring a frequency error between a frequency of an output signal of an oscillator and a frequency of a synchronizing signal. When...
5608355 Automatic adjustment circuit for an oscillator  
An automatic adjustment circuit for an oscillator converts an output from a register into an analog signal by means of a D/A converter. An oscillation frequency of an oscillator is controlled by an...
5608354 Phase-locked loop circuit obtaining the phase difference between time series pulse strings and a reference frequency  
A phase-locked loop circuit includes a voltage-controlled oscillator, a pre-scaler, a main counter, a shift register, and a phase comparison section. The oscillation frequency of the...
5606290 Phase locked loop circuit having lock holder  
A phase locked loop circuit comprising a reference counter, a programmable counter, a phase detector and a lock detector. The phase locked circuit further comprises a lock enable unit for...
5602513 Reversed phase-locked loop  
A phase-locked loop (PLL) frequency synthesizer is connected in reverse to a reference signal and a controlled oscillator loop including a low pass filter and a voltage-controlled oscillator (VCO)....
5602512 Comparator of phase between a digital signal and a clock signal, and corresponding phase locked loop  
A comparator of phase between a digital signal and a clock signal adapted for the construction of a phase locked loop in integrated circuit form, that includes a first channel formed by a flip-flop...
5596614 Method and circuitry for aligning the phase of high-speed clocks in telecommunications systems  
A method and circuitry are provided for detecting and measuring a phase difference between the output signals from a primary stratum clock and a standby stratum clock in a telecommunications...
5594391 N-stage ring connected voltage controlled oscillator  
A VCO includes an oscillator and a controller for controlling the operation of the oscillator. The oscillator is formed by connecting odd number of stages of delay circuits in a ring form. The...
Matches 601 - 650 out of 1561 < 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 >