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8981858 Spread spectrum oscillator  
An apparatus includes a selection device to select a spreading profile from a plurality of spreading profiles, and an oscillation device to generate clock signals having different frequencies over...
8441217 Oscillator circuit with frequency sweep function  
With an oscillator circuit with a frequency sweep function, a first counter counts a reference clock for a number of counts that corresponds to a digital first setting signal, and generates a...
7843278 Frequency jitter generation circuit  
A frequency jitter generation circuit having a voltage generator and an oscillator circuit is provided. The voltage generator receives an input voltage and converts the input voltage into an upper...
7791426 Frequency modulator  
A clock frequency modulator for an oscillator having a digital circuit for the generation of a signal modulating the clock frequency, the digital circuit adapted to obtain, from the signal...
7521986 Switch element driver circuit and semiconductor device  
Noise generation is reduced further. Oscillation control circuit 11 generates a modulation signal modulating oscillation frequency of an oscillation signal generated by oscillation circuit 12 and...
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...
6898262 Programmable controller  
An output cycle of a pulse string generated from a pulse generating section (2) is divided by a pulse dividing section (3) and a signal having a cycle which is plural times as great as the cycle...
6737904 Clock circuit, GSM phone, and methods of reducing electromagnetic interference  
A method of producing a clock signal with reduced electromagnetic interference spectral components includes providing a first clock signal; producing a second clock signal by delaying the first...
6577203 System and methods for providing a voltage-controlled oscillator  
This invention provides a voltage controlled oscillator that improves the linearity of frequency variable characteristics and increases the range of frequency that can be varied by a control...
6545634 Method for detecting and correcting non-linearities in radio-frequency, voltage controlled oscillators  
A method for detecting and correcting non-linearities in radio-frequency, voltage controlled oscillators provides for digitization of the frequency signal by feeding the undelayed frequency signal...
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...
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,...
5834979 Automatic frequency control apparatus for stabilization of voltage-controlled oscillator  
The output of a voltage-controlled oscillator (VCO), after being passed through a resonator having a single-peak characteristic, is detected by a detector. The output of the detector is sampled...
5805000 Logical lose-gain circuit and electronic device having logical loose-gain circuit  
A regulating circuit for a quartz crystal oscillator-based timepiece is capable of compensating for large deviations in oscillation frequency of the quartz crystal oscillator. A frequency divider...
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...
5521532 Digital synthesizer controlled microwave frequency signal source  
A signal source provides an output signal which can sweep over a broad frequency range in a well-controlled manner. The signal source includes a voltage controlled oscillator (VCO) producing the...
5379001 Closed loop linearizer for ramp modulated VCO  
A closed loop linearizer method and apparatus for providing a linear ramp modulation for a voltage controlled oscillator (VCO). A counter is connected to the VCO for calculating two frequency...
5374903 Generation of wideband linear frequency modulation signals  
A low-frequency low bandwidth Linear Frequency Modulation (LFM) waveform, nominally a 1 MHz to 10 Mz swept frequency analog sinusoid or digital square wave, is produced by direct digital...
5225794 Method and apparatus for a sweep oscillator  
A method and apparatus for a sweep oscillator and a spectrum analyzer containing the sweep oscillator having a precisely determined center frequency includes a sweep circuit having a sawtooth...
5210719 Sweep frequency pest control apparatus  
An apparatus and method utilizing a sweep-frequency, high voltage generator coupled to an applicator gun for feeding electric power into pest-infested dielectrics, for example termite-infested...
5210539 Linear frequency sweep synthesizer  
A circuit for generating an output signal having an output frequency that varies linearly with time, and to an FM CW radar system utilizing such a circuit. The circuit includes a voltage...
5175509 Frequency control circuit for swept frequency oscillator  
Linearizing circuitry for an FMCW transmitter (1,2) employing a linear modulation waveform. The output signal is sampled (3,4,5) in successive intervals, small compared to the modulation period,...
5028886 Swept frequency slope correction system for synthesized sweeper  
A swept synthesizer signal source provides a digital synchronization signal for accurate internal synchronization of events and for external synchronization of data taking and other operations to...
4931749 Phase locked loop sweep frequency synthesizer  
A frequency synthesizer is provided in which the output is a truly continuous sweep of frequency, not a staircase of spot frequencies. A programmable frequency divider PD is connected to the...
4901034 Process and circuit for exciting an ultrasonic generator and its use for atomizing a liquid  
In a process and a circuit for exciting an ultrasonic generator the latter is excited by an output signal of a voltage-controlled oscillator, which is controlled by a control device including a...
4855690 Integrated circuit random number generator using sampled output of variable frequency oscillator  
An integrated circuit random number generator which uses a triangular output analog oscillator to vary the frequency of a higher frequency voltage controlled oscillator. The output of the voltage...
4810975 Random number generator using sampled output of variable frequency oscillator  
A random number generator designed for use with an electronic key uses a triangular output analog oscillator to vary the frequency of a higher frequency voltage controlled oscillator. The output...
4797637 PLL frequency synthesizer  
A PLL frequency synthesizer comprises a voltage controlled oscillator which oscillates in response to a frequency signal corresponding to a control signal to be input and which outputs the...
4728906 Tuning and calibration circuits for CW and sweep frequency signal generators  
A signal generating device and method of control thereof for producing a desired output frequency, the generator having coarse and fine tuning controls capable of producing frequency changes over...
4695809 Microwave sweep frequency oscillator  
A microwave frequency oscillator capable of being linearly swept over a wide frequency range around a central frequency comprising a field-effect transistor with a high gain, the output of which...
4679161 Calibrated overlapping frequency sweep  
An overlapping frequency sweep system (10) includes a complex multiplier (15) located between two reflective array compressors (RACs 13 and 21). The complex multiplier compensates for the...
4647873 Adaptive linear FM sweep corrective system  
An apparatus and method for generating an output signal having portions thereof being linearly swept in frequency. A controller, responsive to external signals, generates a series of control...
4603305 Apparatus and method for sweep oscillator calibration  
A method and apparatus for generating a sweep signal, the frequency of which is accurately known at all times during the sweep cycle. The beginning and ending frequencies are fixed by a...
4560960 Digital frequency synthesizer for generating a frequency-modulated signal and radio frequency apparatus including such a device  
A digital device generating a frequency-modulated signal. The device comprises a programmable divider which divides the frequency fH of the clock by a variable integer N supplied by a control...
4554516 Frequency source having YIG absorption/transmission filter  
An electronically tunable solid-state microwave frequency source comprises a transmission-absorption filter incorporated within a magnetic structure. The transmission-absorption filter is employed...
4546328 PLL Swept frequency generator with programmable sweep rate  
A phase-locked voltage controlled oscillator for generating frequency modulated waveforms having a programmable digital RF phase shifter to determine the phase difference between the output signal...
4518932 Coaxial magnetron having cavity walls vibrated by tuning fork  
A co-axial magnetron is provided with a cavity whose resonant frequency can be very rapidly altered in a cyclic manner so that the microwave output frequency of the magnetron can be chosen to lie...
4513256 Swept frequency signal generator  
A sweep voltage from a sweep voltage generator is provided to sweep start and stop adjusting means, the outputs of which are summed by a summing circuit and, by the summed output, the oscillation...
4499435 System for linearizing sweep of voltage controlled oscillator  
Non-linearities in the sweep output of a voltage controlled oscillator are automatically linearized by a scheme that compensates for changes in slope of the variation in frequency with time during...
4486717 Phase controlled oscillator including a phase lock loop and dual sweep oscillators  
A phase controlled oscillator comprises a first sweeping oscillator producing an output voltage controlled by a control input signal and a first sweeping signal within a limited output voltage...
4482872 Swept frequency oscillators having time constant-controlled signal level detector  
A swept frequency oscillator is capable of providing an output signal whose frequency can be swept over a very wide range at a rate which is not dictated by the period of the lowest frequency in...
4480232 Method and apparatus for digital automatic frequency control of chirped oscillator  
The average frequency and sweep rate of a chirped oscillator are automatically digitally controlled for correction of long term drift. During each of successive swept-frequency chirps, the swept...
4470025 Method and circuitry for chirped oscillator automatic frequency control  
The starting frequency and sweep rate of a chirped frequency-shift-keyed oscillator are automatically controlled for correction of long-term drift. The substantially linear swept frequency output...
4468638 Linear sweep frequency modulator for FM/CW radio altimeter  
A linear sweep frequency modulator for a varactor tuned transistor microwave oscillator used in an FM/CW radio altimeter where the oscillator-frequency v. varactor bias characteristic is...
4442412 Phase locked-loop generator with closed-loop forcing function shaper  
A phase locked-loop circuit includes a non-linear voltage controlled oscillator ideally producing a desired output frequency as a function of time and a memory producing signals which add to the...
4419735 Signal source for compressor analog  
An improved driving signal source for an electrical analog of a reciprocating compressor generates a variable frequency sinusoidal output. The ratio between the electrical frequency used by the...
4417218 Linearizing circuit for a high frequency voltage controlled oscillator  
A circuit for linearizing the oscillator sweep output frequency signal of a oltage controlled oscillator is disclosed. The voltage controlled oscillator is driven by the output of an op amp, which...
4398275 Linear frequency sweep generator for continuous transmission FM sonar  
A device for producing a varying frequency sine wave synthesized so that frequency is swept linearly with time for use in a continuous transmission FM sonar. A crystal clock, divider and a 16 bit...
4389638 I.C. Alarm signal generator  
A yelping alarm signal generator has a current controlled audio oscillator with a feedback loop around it that produces a control current that is a direct function of the oscillation frequency so...
4349789 Stabilized sweep frequency generator with adjustable start and stop frequencies  
The oscillation frequency of a variable frequency oscillator is swept by a sweep signal from a sweep signal generator and the oscillation frequency is compared with a preset sweep start frequency...

Matches 1 - 50 out of 198 1 2 3 4 >