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8175199 |
Wireless receiver
A wireless receiver realizes multi-band and multi-mode operations while reducing power consumption of a local oscillator. The receiver includes the local oscillator for discontinuously changing a...
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8085097 |
Integrated ramp, sweep fractional frequency synthesizer on an integrated circuit chip
An integrated ramp, sweep fractional frequency synthesizer system on an integrated circuit chip includes an integrated circuit chip having a fractional frequency synthesizer with a fractional...
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8018294 |
Oscillator device, optical deflector and image forming apparatus using the optical deflector
An oscillator device includes an oscillation system having an oscillator and an elastic supporting member, a detecting member for detecting oscillation amplitude of the oscillator, a driving member...
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8004197 |
Method and apparatus for collector sweeping control of an electron beam
A collector sweeping method for controlling an electron beam in a beam collector, in particular of a magnetic gyrotron device, comprises the steps of subjecting the electron beam to a transversal...
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7986193 |
Noise reduction within an electronic device using automatic frequency modulation
Disclosed is a system and method for providing an oscillating signal of relatively precise frequency without using a signal provided by a crystal as a reference. Disclosed is a feedback oscillator...
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7800451 |
Frequency adjustment for clock generator
A fractional-N divider receives an input signal and supplies a divided signal divided in accordance with an integer divide control signal determined from a divide ratio. A phase interpolator is...
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7622872 |
Actuator driving apparatus
An actuator driving apparatus comprises the following. A start signal generator generates a start signal having a frequency substantially equal to the resonance frequency of the movable portion of...
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7545847 |
Frequency synthesizer applied to frequency hopping system
A frequency synthesizer applied to a frequency hopping system includes a voltage controlled oscillator (VCO), a phase lock loop (PLL) system, a second frequency divider, a first SSB mixer, a second...
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7449876 |
Swept-frequency measurements with improved speed using synthetic instruments
A synthetic test system for swept-frequency measurements that has a clock synchronization device to enable test boxes and devices that form the synthetic test system to have a common sense of time...
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7439815 |
Method and apparatus for switching on an ultrasound oscillation system
In a method and a circuit arrangement for operating an ultrasound oscillation system, wherein an excitation voltage is applied to an ultrasound oscillation system comprising an ultrasound...
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7431728 |
Ultrasound medical devices, systems and methods
Ultrasound medical devices, systems and methods are described. According to an example method, an absolute value of a first input to a voltage controlled oscillator (VCO) is determined. The VCO is...
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7409029 |
Transmission device for automatically set an optimal point for a signal decision making
There is provided a flexible transmission device capable of automatically setting an optimal point for a signal decision making with high accuracy, so that highly reliable high-quality signal...
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7365608 |
Digital frequency synthesiser and a method for producing a frequency sweep
A single chip digital frequency synthesiser (1) for synthesising a frequency swept synthesised output signal of a selectable frequency sweep comprises a direct digital synthesiser (5) which...
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7362826 |
Receiver including an oscillation circuit for generating an image rejection calibration tone
A receiver circuit includes an oscillator circuit configured to generate a calibration tone and a phase locked loop (PLL) reference signal. An output frequency of the VCO may be divided by...
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7355484 |
Oscillator and radar apparatus using the same
An oscillator and a radar apparatus that includes a resonator electro-magnetically connected to a micro strip line and a rotor connected to the resonator by capacitance. The bottom surface of the...
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7155190 |
DDS-PLL method for frequency sweep
A high frequency sweep generator uses a DDS-PLL method for frequency sweep over wide frequency spans. A digital sweep generator produces a linear ramp signal using DDS techniques that is applied to...
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6952569 |
Wireless transmitter having a modified translation loop architecture
A transmitter for a wireless handset having a modified translation loop architecture. The transmitter includes a VCO that generates a modulated transmit signal having a frequency fTx, and a...
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6946916 |
Arrangement and a method relating to phase locking
The present invention relates to an arrangement for phase locking of a Voltage Controlled Oscillator (VCO) to a selected frequency harmonic among a number of predetermined or available frequencies...
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6891904 |
Modulation signal analysis apparatus
An analysis operation section uses a digital signal converted by an A/D converter, and performs frequency analysis for a modulation signal and modulation analysis for the modulation signal selected...
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6704382 |
Self-sweeping autolock PLL
An improved phase-lock loop circuit comprising a phase detector, a loop filter, and a voltage controlled oscillator. The phase detector samples the phase-lock loop input signal at various points in...
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6585338 |
Quick start resonant circuit control
A circuit and method for assuring rapid initiation of resonant oscillation of an electromechanically oscillatory system driven by phase lock loop circuits. An open loop starting signal commences...
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6504354 |
Signal analysis apparatus having YTO yttrium-iron garnet tuned oscillator
A sweep controller supplies a current to a YTO(YIG-Yttrium-Iron-Garnet Tuned Oscillator) from a current drive circuit in such a manner that frequencies corresponding to a first range in an...
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6469584 |
Phase-locked loop system and method using an auto-ranging, frequency sweep window voltage controlled oscillator
A system and method have been provided for a phase-locked loop (PLL) circuit to use a selectable VCO frequency range during the acquisition of a signal, with a larger VCO frequency sweep window...
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6460001 |
Apparatus for and method of measuring a peak jitter
An input clock signal is transformed into a complex analytic signal zc(t) by an analytic signal transforming means 13 and an instantaneous phase of its real part xc(t) is estimated using the...
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6424229 |
Tunable voltage controlled oscillator circuit having aided acquisition and methods for operating the same
Voltage controlled oscillator circuits are provided including a voltage controlled oscillator (VCO) having an input and an output responsive to the input. A tuning circuit coupled to the VCO sets a...
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6373235 |
Apparatus and method for determining the position and motion of an object and for precise measurement of phase-related values
In one embodiment, a high-resolution measurement apparatus and method determine the position and motion of an object such as a human hand relative to a sensor array. Capacitance transferred to the...
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6334060 |
Multi-channel or split-frequency, low frequency, telemetry circuit and method between transmitters and receivers
A multi-channel system is provided for both wide-band and narrow band low frequency transmission/reception of digital telemetry. The multi-channel system uses coherent detection having a high...
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6252464 |
Numerically-controlled nyquist-boundary hopping frequency synthesizer
An inexpensive numerically-controlled fast frequency-hopping microwave synthesizer. A voltage-controlled oscillator (VCO) output phase remains locked to an internal direct digital synthesizer (DDS)...
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6236276 |
Method for seeking and setting a resonant frequency and tuner operating according to the method
In a method for seeking and setting a resonant frequency for a load impedance and a tuner for carrying out the method, a first frequency sweep is performed over a predetermined frequency interval...
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6201447 |
Phase synchronization circuit with units for setting sweep frequency and control voltage
Improved phase synchronization circuits shorten the length of the synchronization pull-in time. The phase synchronization circuit according to the first invention changes the free-running frequency...
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6150892 |
Method and device for digitally synthesizing frequency
A method and device for frequency synthesizing, in which the digital frequency synthesizer includes a clock pair having two similar ring-oscillators to separately generate a search frequency and an...
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6147560 |
Method and device relating to supervision and control of an oscillator signal
The present invention relates to methods and devices for such control and supervision of an oscillator signal from a controllable oscillator that is done mainly to control the frequency variation...
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6137846 |
AFC circuit for a frequency scanning FSK receiver
An AFC circuit for a frequency scanning FSK receiver is so constructed that through put of data which can be transmitted is improved by shortening a header of a packet signal owing to the fact that...
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6133795 |
Oscillator circuit
A stabilised voltage controlled oscillator circuit comprises a closed loop circuit containing a voltage controlled oscillator (34), a local oscillator (40) and a harmonic mixer (38) that mixes a...
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6114987 |
Dual-loop linearizer for FM-CW radar
A system and method for generating a linear frequency sweep while also improving the phase noise characteristics of a microwave or millimeter wave signal source. The invention uses two phase lock...
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6064270 |
System and method for compensating for reference frequency drift in a communications system
A system for compensating for reference frequency drift in a communications system. The inventive system includes a frequency source for providing a reference frequency. An error determination...
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6031427 |
System for sweeping a phase lock loop into lock with automatic initiation and shutdown
A phase locked loop ("PLL") 28 containing apparatus for automatically causing the PLL to achieve phase lock when first energized or after having lost phase lock. In addition to a phase detector 4,...
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6016069 |
Attenuating systems and methods for acquiring synchronization in phase locked loops
A phase locked loop includes a controlled oscillator that is responsive to a control signal to generate an output signal, the frequency of which is a function of the control signal. A phase...
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6014063 |
Method and apparatus for reducing radiated electromagnetic emissions from harmonic frequencies for electronic equipment
A system of spreading the energy of higher harmonic frequencies in digital circuits to lower the interference to bandpass receivers is disclosed. A set of passive, impedance-regulated circuits,...
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5940457 |
Millimeter-wave (MMW) synthesizer with FSK modulation transmitter
A frequency-shift-keyed PLL frequency synthesizer with large frequency-muplication factor, with absolute frequency deviation independent of frequency-multiplication factor. The PLL also has...
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5903195 |
Automatically ranging phase locked loop circuit for microprocessor clock generation
An improved phase locked loop (PLL) circuit is provided for use in microprocessor clock generation. A ring oscillator provides an output frequency signal. A voltage to current converter converts...
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5874863 |
Phase locked loop with fast start-up circuitry
A phase-locked loop (PLL) circuit has a phase comparator for comparing the phases of a local clock frequency and a reference frequency to generate a control signal indicative of a direction of...
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5774022 |
Digital clock recovery loop
A communications system including a clock recovery circuit that extracts a clock signal from incoming digital data, the clock recovery circuit including a voltage controlled oscillator having a...
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5751747 |
Linear swept frequency generator
A linear swept frequency generator includes a signal generator that generates an output signal having a frequency that varies between a first frequency and a second frequency. A delay element, such...
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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...
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5703538 |
Radar exciter local oscillator phase lock acquisition control circuit
A phase lock acquisition control circuit for the local oscillator (LO) of a radar exciter. The control circuit includes a programmable logic array, a microsequencer and a counter employed as a...
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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...
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5642081 |
FMCW VCO closed loop linearizer
The present invention overcomes the problems discussed above by providing a linearizer apparatus for providing a linear ramp modulation for a voltage control oscillator (VCO), including voltage...
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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...
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5557241 |
Linear chirp generation using VCO tuning with polynomial predistortion
An ultra-linear chirp generator includes a voltage controlled oscillator (VCO) having a tuning characteristic which is naturally nonlinear, a linear ramp generator which generates a linearly...
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