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Class Information
Number: 331/135
Name: Oscillators > Phase shift type
Description: Oscillators systems comprising a feedback amplifier having a predetermined phase shift between the input and output voltages thereof, the feedback path including a passive phase shifting network for providing a phase shift of such amount to cause the oscillator system to generate sustained oscillations.

Sub-classes under this class:

Class Number Class Name Patents
331/137 With r.c. ladder-type phase shift network 18
331/136 Zero phase shift 7

Patents under this class:
1 2 3 4

Patent Number Title Of Patent Date Issued
8665033 Varactorless tunable oscillator Mar. 4, 2014
8659363 OTA-based current-mode filter and oscillator Feb. 25, 2014
8624685 System and method for reducing lock time in a phase-locked loop Jan. 7, 2014
8614606 Delay-line self-oscillator Dec. 24, 2013
8604887 Current-feedback operational amplifier-based sinusoidal oscillator Dec. 10, 2013
8531249 Oscillator for generating output signal with adjustable frequency Sep. 10, 2013
8456251 Phase-controlled oscillator Jun. 4, 2013
8436687 Oscillating apparatus May. 7, 2013
8395456 Variable phase amplifier circuit and method of use Mar. 12, 2013
8264289 Nth-order arbitrary-phase-shift sinusoidal oscillator structure and analytical synthesis method of making the same Sep. 11, 2012
8232846 Resistor capacitor (RC) oscillator Jul. 31, 2012
8219054 Oscillating circuit and radio communication apparatus Jul. 10, 2012
8154309 Configurable PSRO structure for measuring frequency dependent capacitive loads Apr. 10, 2012
8130049 Submillimeter-wave signal generation by linear superimposition of phase-shifted fundamental tone signals Mar. 6, 2012
8076981 Self-calibrating oscillator Dec. 13, 2011
8044734 Method and apparatus for mitigating VCO pulling Oct. 25, 2011
8001410 Efficient clocking scheme for ultra high-speed systems Aug. 16, 2011
7999627 Resonant circuit arrangement, method for operating said resonant circuit arrangement and method for the operation and use thereof Aug. 16, 2011
7969252 System and method for reducing lock time in a phase-locked loop Jun. 28, 2011
7965149 Resistor-capacitor oscillator Jun. 21, 2011
7944217 Object proximity detector and object position detector May. 17, 2011
7924108 Oscillator amplifier with input clock detection and method therefor Apr. 12, 2011
7902930 Colpitts quadrature voltage controlled oscillator Mar. 8, 2011
7863992 Oscillator having comparator circuits having adjustable driving capabilities and method for operating the same Jan. 4, 2011
7863990 Oscillation circuit, test apparatus and electronic device Jan. 4, 2011
7847643 Circuit with multiphase oscillator Dec. 7, 2010
7825741 Frequency multipliers using multi-phase oscillation Nov. 2, 2010
7741920 Quadrature oscillator with simplified amplitude, phase and frequency control Jun. 22, 2010
7705685 Low-voltage oscillator with capacitor-ratio selectable duty cycle Apr. 27, 2010
7687703 Method and device for generating triangular waves Mar. 30, 2010
7659783 System and method for phase-locked loop (PLL) for high-speed memory interface (HSMI) Feb. 9, 2010
7629858 Time delay oscillator for integrated circuits Dec. 8, 2009
7486151 Semiconductor circuit for use in timer circuit or oscillator circuit Feb. 3, 2009
7474162 RC-oscillator circuit Jan. 6, 2009
7414482 Resonance mode selection using a resonator-synchronized second-order oscillator Aug. 19, 2008
7411466 Coil-less overtone crystal oscillator Aug. 12, 2008
7397316 Ring oscillator for calibrating phase error and phase-error calibration method therefor Jul. 8, 2008
7391840 Phase locked loop circuit, electronic device including a phase locked loop circuit and method for generating a periodic signal Jun. 24, 2008
7375600 Integrated quartz oscillator circuit May. 20, 2008
7356719 Microcomputer Apr. 8, 2008
7339442 Baseband RC filter pole and on-chip current tracking system Mar. 4, 2008
7336135 Oscillator and semiconductor device Feb. 26, 2008
7315220 Voltage controlled oscillator Jan. 1, 2008
7295081 Time delay oscillator for integrated circuits Nov. 13, 2007
7286022 Resistor-capacitor (RC) oscillator insensitive to process, voltage, and temperature variances Oct. 23, 2007
7271670 CR oscillation circuit Sep. 18, 2007
7205857 Oscillator with quadrature output in a cross-coupled configuration Apr. 17, 2007
7202753 Oscillation circuit and radio communication device using the same Apr. 10, 2007
7199676 Frequency adjustment circuit Apr. 3, 2007
7170357 Crystal oscillator with wide tuning range Jan. 30, 2007

1 2 3 4

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