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Class Information
Number: 331/57
Name: Oscillators > Ring oscillators
Description: Subject matter wherein the oscillator comprises three or more active elements connected or cascade, the output of one active element being connected to the input of another active element to form a closed chain or loop, the active elements being so connected and biased that they are caused to switch from a conducting to a nonconducting state in succession, cyclically, thereby generating self-sustained oscillations.










Patents under this class:
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Patent Number Title Of Patent Date Issued
6667646 Small-sized digital generator producing clock signals Dec. 23, 2003
6664832 Arbitrary waveform synthesizer using a free-running ring oscillator Dec. 16, 2003
6664861 Method and apparatus for stable phase-locked looping Dec. 16, 2003
6661299 Odor sensor with organic transistor circuitry Dec. 9, 2003
6661300 Ring oscillator and means for controlling the frequency thereof Dec. 9, 2003
6657502 Multiphase voltage controlled oscillator Dec. 2, 2003
6657503 High noise rejection voltage-controlled ring oscillator architecture Dec. 2, 2003
6657504 System and method of determining ring oscillator speed Dec. 2, 2003
6650188 Coupling for LC-based VCO Nov. 18, 2003
6650190 Ring oscillator with adjustable delay Nov. 18, 2003
6650191 Low jitter ring oscillator architecture Nov. 18, 2003
6650194 Phase shift control for voltage controlled oscillator Nov. 18, 2003
6650196 Multi-frequency band controlled oscillator Nov. 18, 2003
6646512 Self-bias and differential structure based PLL with fast lockup circuit and current range calibration for process variation Nov. 11, 2003
6642801 Oscillator using virtual stages for multi-gigabit clock recovery Nov. 4, 2003
6642802 Ring oscillator providing single event transient immunity Nov. 4, 2003
RE38274 Variable delay cell with hysteresis and ring oscillator using same Oct. 14, 2003
6633202 Precision low jitter oscillator circuit Oct. 14, 2003
6624710 External oscillator resistor detection circuit Sep. 23, 2003
6621313 High frequency system with duty cycle buffer Sep. 16, 2003
6621358 Differential voltage controlled oscillator, and method therefor Sep. 16, 2003
6621359 Noise elimination circuit Sep. 16, 2003
6621360 Extended frequency range voltage-controlled oscillator Sep. 16, 2003
6617934 Phase locked loop circuits, systems, and methods Sep. 9, 2003
6617935 Oscillator and current source Sep. 9, 2003
6617936 Phase controlled oscillator Sep. 9, 2003
6611177 Voltage controlled oscillator including fluctuation transmitter for transmitting potential fluctuation by noise Aug. 26, 2003
6608529 Frequency synthesis apparatus, systems, and methods Aug. 19, 2003
6603363 Oscillator and oscillator adjustment method with stepwise delay Aug. 5, 2003
6593820 High frequency voltage controlled oscillator Jul. 15, 2003
6590458 Clock generator circuit with a PLL having an output frequency cycled in a range to reduce unwanted radiation Jul. 8, 2003
6587007 Ring topology based voltage controlled oscillator Jul. 1, 2003
6577202 Multiple duty cycle tap points for a precise and programmable duty cycle generator Jun. 10, 2003
6574169 Delay test system for normal circuit Jun. 3, 2003
6566968 Oscillator having multi-phase complementary outputs May. 20, 2003
6566970 High-speed, high PSRR, wide operating range voltage controlled oscillator May. 20, 2003
6559727 High-frequency low-voltage multiphase voltage-controlled oscillator May. 6, 2003
6556088 Phase-locked loop having a stable damping factor Apr. 29, 2003
6556089 Electronic circuitry Apr. 29, 2003
6556094 Oscillator circuit and integrated circuit for oscillation Apr. 29, 2003
6552619 Multi-channel clock recovery circuit Apr. 22, 2003
6549081 Integrator/ comparator control of ring oscillator frequency and duty cycle Apr. 15, 2003
6549082 High frequency oscillator Apr. 15, 2003
6545549 Remotely controllable phase locked loop clock circuit Apr. 8, 2003
6542040 Phase-locked loop employing programmable tapped-delay-line oscillator Apr. 1, 2003
6538522 Method and ring oscillator for evaluating dynamic circuits Mar. 25, 2003
6535070 Variable frequency oscillator, and phase locked loop and clock synchronizer using thereof Mar. 18, 2003
6535071 CMOS voltage controlled phase shift oscillator Mar. 18, 2003
6529084 Interleaved feedforward VCO and PLL Mar. 4, 2003
6525613 Efficient current feedback buffer Feb. 25, 2003

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