Matches 1 - 50 out of 384 1 2 3 4 5 6 7 8 >
Match Document Document Title
7605667 Frequency synthesizer with a harmonic locked phase/frequency detector  
A frequency synthesizer. The frequency synthesizer comprises a harmonic locked phase/frequency detector, a low pass filter, a voltage controlled oscillator, and a frequency divider. The harmonic...
7598815 Multiple frequency generator for quadrature amplitude modulated communications  
Multiple carrier frequencies are provided from a phase locked loop, especially closely adjacent quadrature amplitude modulated subcarriers for multiplexed data communications. A quadrature voltage...
7545223 PLL circuit  
A PLL circuit according to an embodiment of the present invention includes: a phase comparator to output an up signal and a down signal based on a phase difference between a reference clock signal...
7528666 Apparatus and method for phase lock loop gain control using unit current sources  
A gain compensator compensates for the gain variation of a varactor-tuned voltage tuned oscillator (VCO) in a phase lock loop (PLL). The VCO includes a parallel LC circuit having multiple fixed...
7508270 Differential-to-single-ended converter and phase-locked loop circuit having the same  
In a differential-to-single-ended (D2S) converter having reduced power consumption and excellent duty ratio characteristics, and a phase-locked loop (PLL) circuit having the same, the D2S converter...
7504892 Charge-pump for phase-locked loop  
A charge-pump includes a first charge-pump sub-circuit having a control terminal that communicates with a first bias voltage line. A first charge-pump mirror sub-circuit regulates current on the...
7471160 Real-time frequency band selection circuit for use with a voltage controlled oscillator  
An integrated circuit including a phase-locked loop (PLL) circuit responsive to a voltage controlled oscillator (VCO) frequency band selection circuit that provides automatic frequency band...
7400205 Frequency synthesizer and oscillation control method of frequency synthesizer  
The present invention provides a frequency synthesizer capable of switching an oscillation frequency band while maintaining a lock state realized with a small-scale and low-current-consumption...
7339439 Voltage-controlled oscillator with multi-phase realignment of asymmetric stages  
A multi-phase realigned voltage-controlled oscillator (MRVCO) achieves phase realignment based on charge injection in the VCO stages. The individual VCO stages provide an oscillating output signals...
7339438 Phase and delay locked loops and semiconductor memory device having the same  
A phase locked loop includes a phase difference detector for detecting a phase difference between an input clock signal and an output clock signal to generate an up signal and a down signal; a...
7304544 Automatic phase lock loop design using geometric programming  
A method is described that involves developing a more detailed description of a phase lock loop system by substituting, into a monomial or posynomial equation that is part of a family of monomial...
7253691 PLL clock generator circuit and clock generation method  
A clock generator circuit is provided wherein a comparison clock signal is generated by comparing a standard clock signal and an operating clock signal. The comparison clock signal is converted...
7218178 Frequency generator with a phase locked loop  
A frequency generator with a phase locked loop includes a loop filter, the transfer function of which has a pair of complex conjugated poles. The present invention provides an optimum and greatly...
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...
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...
7146149 High isolation switch buffer for frequency hopping radios  
A local oscillator (LO) circuit is disclosed which provides improved isolation between the unselected LO source and a mixer. The LO circuit includes a first LO source to generate a first periodic...
7126432 Multi-phase realigned voltage-controlled oscillator and phase-locked loop incorporating the same  
A multi-phase realigned voltage-controlled oscillator (MRVCO) achieves phase realignment based on charge injection in the VCO stages with the injection amount proportional to the instantaneous...
7053727 Trimming of a two point phase modulator  
Method and system are disclosed for automated calibration of the VCO gain in phase modulators. The method and system of the invention comprises synthesizing, in a phase modulator, a signal having a...
6992536 Voltage-controlled oscillator  
A voltage-controlled oscillator (VCO) enabling proper gain adjustment with a simple configuration. The VCO includes a first current source for generating a first control current in accordance with...
6954110 Replica cell for ring oscillator  
In some embodiments, a ring oscillator includes a plurality of delay cells coupled in series as a ring, and a replica cell coupled to the delay cells to provide at least one bias signal to the...
6919769 Method and apparatus for fast lock acquisition in self-biased phase locked loops  
A self-biased phase locked loop (PLL) circuit includes a charge pump to generate a control voltage, a controlled oscillator coupled to the charge pump to generate the output signal based at least...
6897733 Low offset and low glitch energy charge pump for PLL-based timing recovery systems  
A high precision charge pump used in a phase-lock-loop incorporating a phase/frequency detector is designed and constructed to substantially eliminate the effects of DC offset and glitch errors on...
6894570 Fast frequency locking method and architecture realized by employing adaptive asymmetric charge-pump current mechanism  
The present invention is related to a fast frequency locking method and architecture realized by employing adaptive asymmetric charge-pump current mechanism, whose circuit is composed of elements...
6885251 Low spurious charge pump  
Phase locked loop charge pump comprising a drain node (A, B) and at least a cascode transistor (M 4 , M 6 ) for limiting the variation of the voltage of said drain node, characterized in that an...
6882237 Capture range control mechanism for voltage controlled oscillators  
A voltage controlled oscillator generates an output signal whose frequency varies as a first function of a control voltage applied to a control terminal. The voltage controlled oscillator has a...
6879218 Frequency modulation corrector keeping a good oscillating signal quality and suppressing dependability of a modulation degree  
A correction circuit for a voltage-controlled oscillator (VCO) is arranged outwardly of the voltage-controlled oscillator. The oscillation of the selected frequency and the frequency modulation are...
6867654 Additive phase detector and its use in high speed phase-locked loops  
An apparatus is disclosed that is an analog phase detector where a summation technique is used to determine the phase difference of the two input waveforms of the phase detector. Instead of...
6859108 Current biased phase locked loop  
A phase locked loop (PLL) circuit adjusts a voltage controlled differential oscillator to generate an output frequency signal that is a selected multiple of an input reference signal. An oscillator...
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...
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....
6680654 Phase locked loop with offset cancellation  
A phase locked loop ( 10 ) for generating a variable output frequency signal. The phase locked loop ( 10 ) includes a controlled oscillator ( 14 ) to generate the variable output frequency signal...
6570457 Phase locked loop using sample and hold after phase detector  
The present invention provides a phase locked loop ( 10 ) for generating a variable output frequency signal. The phase locked loop ( 10 ) includes a controlled oscillator ( 14 ) to generate the...
6563389 Phase locked loop with charge injection cancellation  
A phase locked loop ( 10 ) for generating an output frequency signal. The phase locked loop ( 10 ) includes a controlled oscillator ( 14 ) to generate the output frequency signal in response to a...
6549080 Electronic circuit, particularly for a mobile transceiver  
A phase-locked loop circuit is described and has a digital circuit section and an analog circuit section that are fed with different supply voltages. Control signals generated by the digital...
6529082 Dual mode charge pump  
A charge pump has two charge pump nodes. The first charge pump node has a first current source (CS) with a source terminal connected to a positive supply voltage and an output terminal connected to...
6525613 Efficient current feedback buffer  
An efficient current feedback buffer is revealed. The buffer is useful in power supplies for a number of analog and digital devices, including CMOS voltage controlled ring oscillators, frequency...
6515520 Charge pump circuit for phase-locked loop circuitry  
A phase-locked loop (PLL) includes a voltage controlled oscillator (VCO) and a pair of charge pump circuits (CP) and provides a stable oscillation clock signal. A phase comparator compares a...
6512419 Method and apparatus to tune and calibrate an on-chip oscillator in a wireless transceiver chip  
A local oscillator calibrator comprises a main charge pump that drives a voltage controlled oscillator (VCO) through a loop filter. A second, replica charge pump can also drive the VCO, but is...
6504436 Transconductance tuning circuit with independent frequency and amplitude control  
A tuning circuit includes an oscillator that receives an oscillating input signal and a control signal, and generates an oscillating output signal. The control signal is obtained from a frequency...
6466100 Linear voltage controlled oscillator transconductor with gain compensation  
A voltage controlled oscillator of a phase locked loop circuit having digitally controlled gain compensation. The digital control circuitry provides binary logic input to the voltage controlled...
6466098 Analogue-controlled phase interpolator  
Apparatus for generating an oscillating signal in a desired phase relationship with an input signal, including a mixer arranged to receive a pair of reference signals oscillating at a common...
6456166 Semiconductor integrated circuit and phase locked loop circuit  
Object of the present invention is to provide a semiconductor integrated circuit and a voltage control oscillator capable of performing stable oscillating operation and generating an oscillating...
6404290 Fast change charge pump having switchable boost function  
A regulator circuit for providing a regulated voltage, comprises a driver for generating a drive signal, and a charge pump having a first voltage input coupled to a first voltage source, being...
6356158 Phase-locked loop employing programmable tapped-delay-line oscillator  
A phase-locked loop (PLL) having a wide range of oscillator output frequencies and a wide range of loop divider values is realizable in integrated form because the total capacitance of its loop...
6356160 Phase lock loop and automatic gain control circuitry for clock recovery  
A high speed data communication system includes a receiver to recover data and clock signals from communicated data. The receiver circuit has a dual phase lock loop (PLL) circuit. A fine loop of...
6353368 VCO circuit using negative feedback to reduce phase noise  
A low phase noise CMOS voltage controlled oscillator (VCO) circuit. The VCO circuit includes a bias circuit and a VCO cell coupled to the bias circuit. The VCO cell includes a VCO output for...
6346861 Phase locked loop with high-speed locking characteristic  
A phase locked loop (PLL) is use in a radio communication system such as a frequency mixer, a carrier frequency and the like. The phase locked loop (PLL) includes a phase/frequency detector for...
6342819 Frequency synthesizer device and mobile radio device using the same  
In a frequency synthesizer device in which a frequency-division ratio control circuit 6 and other circuits are integrated on the same semiconductor substrate, a power supply 8 for supplying a...
6329882 Third-order self-biased phase-locked loop for low jitter applications  
A self-biased phase-locked loop circuit includes a phase detector, first and second charge pumps, first and second loop filters, and a voltage-controlled oscillator (VCO). The phase detector is...
6326850 High frequency signal generator from a horological time base  
A generator (50) able to be fitted to a clockwork system including a crystal (51a) used as a time base, includes a first oscillator (51) able to supply a first frequency (f1), a second oscillator...
Matches 1 - 50 out of 384 1 2 3 4 5 6 7 8 >