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| Number | Title | Issue Date |
| 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 generated by the oscillator, a first pulse signal having a lower frequency th... | 09/07/2010 |
| 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 produces the frequency swept synthesised output signal on an o... | 04/29/2008 |
| 7274754 | Method and apparatus for frequency division multiplexing A radio transmitter and receiver arrangement includes a transmitter and a receiver. The transmitter generates an electromagnetic carrier that varies in frequency throughout a channel interval, and modulates the carrier with an information signal during the channel i... | 09/25/2007 |
| 7134344 | Control method and apparatus An adaptive control method is provided with particular relevance in methods which use a varying input frequency for analysis of an oscillatory response of a system, such as sine sweep testing. In one aspect the method includes the steps of applying a drive force hav... | 11/14/2006 |
| 7064617 | Method and apparatus for temperature compensation Temperature compensation is achieved by adjusting a divide ratio of a multi-modulus divider circuit in a feedback path of a phase-locked loop based on the detected temperature. The divide ratio is adjusted based on stored adjustment values stored in non-volatile mem... | 06/20/2006 |
| 7023378 | Self-calibrating wideband phase continuous synthesizer and associated methods The synthesizer and method provide a relatively wideband swept frequency signal and include generating a first swept frequency signal with a first generator, and successively switching between different frequency signals with a second generator. Such switching creat... | 04/04/2006 |
| 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 of an output pulse is output from the pulse dividing sect... | 05/24/2005 |
| 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 clock signal; and generating a jittered clock signal by switching betwee... | 05/18/2004 |
| 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 voltage. A resistor circuit is connected between a piezoelectric... | 06/10/2003 |
| 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 and a delayed frequency signal generated therefrom into EX... | 04/08/2003 |
| 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) reference signal over the entire output frequency band, w... | 06/26/2001 |
| 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, preferably housed in a standard enclosure, comprises a power ... | 01/11/2000 |
| 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 and held at a time instant that the control input voltage to ... | 11/10/1998 |
| 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 sequentially divides the reference clock by one-half. A reg... | 09/08/1998 |
| 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 ramping output signal having a linear slope characteristic with ... | 09/17/1996 |
| 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 output signal and a waveform synthesizer producing a referen... | 05/28/1996 |
| 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 values of the oscillator at one or more time points during a ra... | 01/03/1995 |
| 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 synthesis. This waveform is upconverted in frequency and expanded in... | 12/20/1994 |
| 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 waveform, a reference oscillator, a microprocessor controller a... | 07/06/1993 |
| 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 wood. Utilizing a conventional line frequency of 120 or 60 Hz,... | 05/11/1993 |
| 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 controlled oscillator that produces an output signal at its output t... | 05/11/1993 |
| 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, and a cycle count (16) taken in each interval; a reference c... | 12/29/1992 |
| 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 predetermined frequencies generated by an oscillator during... | 07/02/1991 |
| 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 output of a voltage-controlled oscillator (VCO) to divide the VC... | 06/05/1990 |
| 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 triangular wave generator so that its frequency is periodical... | 02/13/1990 |
| 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 controlled oscillator is sampled at a rate much less than t... | 08/08/1989 |
| 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 of the voltage controlled oscillator is sampled at a rate mu... | 03/07/1989 |
| 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 frequency signal as an output of said PLL frequency synthesizer; a... | 01/10/1989 |
| 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 a limited range, wherein the output of the device is combin... | 03/01/1988 |
| 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 is fed back to the input from a coupler consisting of two re... | 09/22/1987 |
| 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 distortions due to both RACs by modifying the phase and amplitude o... | 07/07/1987 |
| 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 signals. An oscillator, responsive to each one of the control si... | 03/03/1987 |
| 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 phase-locked loop and the resulting error correction voltages are sto... | 07/29/1986 |
| 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 circuit. The output pulse signal of the frequency di... | 12/24/1985 |
| 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 with a tunable solid-state oscillator and tunable solid-st... | 11/19/1985 |
| 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 and a phase corrected reference signal to thereby generate... | 10/08/1985 |
| 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 within the available frequency band of the cavity. The cyli... | 05/21/1985 |
| 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 frequency of a voltage controller oscillator is controlled.... | 04/23/1985 |
| 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 a high accuracy calibration mode, prior to placing the VCO... | 02/12/1985 |
| 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 amplitude, a second sweeping oscillator which produces a secon... | 12/04/1984 |
