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Class Information
Number: 331/178
Name: Oscillators > With frequency adjusting means > Cyclic frequency sweeping means (e.g., vibrato)
Description: Oscillators wherein means is provided for periodically or continuously varying the output frequency of the oscillator over a range of frequencies. The means, for example, may be (1) another oscillator driving a reactance tube in the frequency determining circuit of the oscillator whose frequency is being swept, or (2) a continuously running motor driving a reactance element in the frequency determining circuit of the oscillator whose frequency is being swept.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8441217 Oscillator circuit with frequency sweep function May. 14, 2013
7843278 Frequency jitter generation circuit Nov. 30, 2010
7791426 Frequency modulator Sep. 7, 2010
7521986 Switch element driver circuit and semiconductor device Apr. 21, 2009
7365608 Digital frequency synthesiser and a method for producing a frequency sweep Apr. 29, 2008
6898262 Programmable controller May. 24, 2005
6737904 Clock circuit, GSM phone, and methods of reducing electromagnetic interference May. 18, 2004
6577203 System and methods for providing a voltage-controlled oscillator Jun. 10, 2003
6545634 Method for detecting and correcting non-linearities in radio-frequency, voltage controlled oscillators Apr. 8, 2003
6252464 Numerically-controlled nyquist-boundary hopping frequency synthesizer Jun. 26, 2001
6014063 Method and apparatus for reducing radiated electromagnetic emissions from harmonic frequencies for electronic equipment Jan. 11, 2000
5834979 Automatic frequency control apparatus for stabilization of voltage-controlled oscillator Nov. 10, 1998
5805000 Logical lose-gain circuit and electronic device having logical loose-gain circuit Sep. 8, 1998
5557241 Linear chirp generation using VCO tuning with polynomial predistortion Sep. 17, 1996
5521532 Digital synthesizer controlled microwave frequency signal source May. 28, 1996
5379001 Closed loop linearizer for ramp modulated VCO Jan. 3, 1995
5374903 Generation of wideband linear frequency modulation signals Dec. 20, 1994
5225794 Method and apparatus for a sweep oscillator Jul. 6, 1993
5210539 Linear frequency sweep synthesizer May. 11, 1993
5210719 Sweep frequency pest control apparatus May. 11, 1993
5175509 Frequency control circuit for swept frequency oscillator Dec. 29, 1992
5028886 Swept frequency slope correction system for synthesized sweeper Jul. 2, 1991
4931749 Phase locked loop sweep frequency synthesizer Jun. 5, 1990
4901034 Process and circuit for exciting an ultrasonic generator and its use for atomizing a liquid Feb. 13, 1990
4855690 Integrated circuit random number generator using sampled output of variable frequency oscillator Aug. 8, 1989
4810975 Random number generator using sampled output of variable frequency oscillator Mar. 7, 1989
4797637 PLL frequency synthesizer Jan. 10, 1989
4728906 Tuning and calibration circuits for CW and sweep frequency signal generators Mar. 1, 1988
4695809 Microwave sweep frequency oscillator Sep. 22, 1987
4679161 Calibrated overlapping frequency sweep Jul. 7, 1987
4647873 Adaptive linear FM sweep corrective system Mar. 3, 1987
4603305 Apparatus and method for sweep oscillator calibration Jul. 29, 1986
4560960 Digital frequency synthesizer for generating a frequency-modulated signal and radio frequency apparatus including such a device Dec. 24, 1985
4554516 Frequency source having YIG absorption/transmission filter Nov. 19, 1985
4546328 PLL Swept frequency generator with programmable sweep rate Oct. 8, 1985
4518932 Coaxial magnetron having cavity walls vibrated by tuning fork May. 21, 1985
4513256 Swept frequency signal generator Apr. 23, 1985
4499435 System for linearizing sweep of voltage controlled oscillator Feb. 12, 1985
4486717 Phase controlled oscillator including a phase lock loop and dual sweep oscillators Dec. 4, 1984
4482872 Swept frequency oscillators having time constant-controlled signal level detector Nov. 13, 1984
4480232 Method and apparatus for digital automatic frequency control of chirped oscillator Oct. 30, 1984
4470025 Method and circuitry for chirped oscillator automatic frequency control Sep. 4, 1984
4468638 Linear sweep frequency modulator for FM/CW radio altimeter Aug. 28, 1984
4442412 Phase locked-loop generator with closed-loop forcing function shaper Apr. 10, 1984
4419735 Signal source for compressor analog Dec. 6, 1983
4417218 Linearizing circuit for a high frequency voltage controlled oscillator Nov. 22, 1983
4398275 Linear frequency sweep generator for continuous transmission FM sonar Aug. 9, 1983
4389638 I.C. Alarm signal generator Jun. 21, 1983
4349789 Stabilized sweep frequency generator with adjustable start and stop frequencies Sep. 14, 1982
4346352 Linear and logarithmic sweep control circuits for a voltage-controlled oscillator Aug. 24, 1982

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