| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 331115000 | Negative resistance | 17 |
| 20080204157 | VOLTAGE CONTROLLED OSCILLATOR, AND PLL CIRCUIT AND RADIO COMMUNICATION APPARATUS USING THE SAME - A voltage controlled oscillator of the present invention comprises a reference voltage generation section | 08-28-2008 |
| 20080231384 | Frequency Tunable Oscillator - There is provided a frequency tunable oscillator that has less degradation of oscillation characteristics due to a parasitic reactance component or the like without mounting therein a lumped constant element such as a variable capacitance element. The frequency tunable oscillator includes a negative resistance element and a resonator which together form a feedback circuit. The frequency tunable oscillator further includes in at least a part of the feedback circuit, a distributed constant material so configured as to have a distributed constant such that an electrical length in the resonator is modulated, and a modification means for externally modifying the distributed constant material, wherein the oscillation frequency can be varied through the external modification by the modification means. | 09-25-2008 |
| 20080272851 | LC voltage controlled oscillator with tunable capacitance unit - A tunable capacitance unit coupled between a pair of circuit nodes. The tunable capacitance unit comprises a tuning input supplying a tuning voltage, and first and second tuning capacitance units. Each of the tuning capacitance units comprises a pair of accumulation-mode MOS varactors with source/drains thereof coupled to the tuning input, a pair of blocking capacitors coupled to a respective gate of the accumulation-mode MOS varactors and to a respective one of the circuit nodes, and a pair of biasing resistors coupled to a respective gate of the accumulation-mode MOS varactors and to a respective bias terminal receiving a respective reference voltage. The reference voltages received by the first and second tuning capacitance units are symmetrical to a predetermined voltage. | 11-06-2008 |
| 20080315964 | Voltage controlled oscillator using tunable active inductor - A tunable active inductor and a voltage controlled oscillator (VCO) are provided. The tunable active inductor includes a first current source coupled to a power source, a first metal-oxide semiconductor (MOS) transistor including a drain coupled to the first current source and a gate coupled to a first bias voltage, a second MOS transistor including a drain coupled to the power source and a gate coupled to the drain of the first MOS transistor, the gate of the second MOS and the drain of the first MOS being coupled to a second bias voltage, a resonator coupled to a source of the second MOS transistor, and a second current source coupled to the resonator. The VCO employs the tunable active inductor to freely vary the oscillation range of the VCO in a high frequency band. | 12-25-2008 |
| 20090219102 | STABILIZED ELECTRICAL OSCILLATORS WITH NEGATIVE RESISTANCE - An electrical oscillator includes a first oscillating transistor and a second oscillating transistor. The electrical oscillator also includes a first non-linear load connected to a terminal of the first oscillating transistor, and a second non-linear load connected to a terminal of the second oscillating transistor. The electrical oscillator also includes a negative resistance generated between the terminal of the first oscillating transistor and the terminal of the second oscillating transistor. The electrical oscillator does not include a tunable resonator. | 09-03-2009 |
| 20110018645 | VOLTAGE CONTROLLED OSCILLATOR - A voltage controlled oscillator (VCO) includes a voltage controlled current source (VCCS), a negative resistance circuit (NRC), a first transformer, a second transformer, a first transistor and a second transistor. A current terminal of the VCCS receives a control voltage. First terminals of first and second current paths in the NRC are coupled to a current terminal of the VCCS. Primary sides of the first and the second transformers are respectively coupled to second terminals of the first and the second current paths. Secondary sides of the first and the second transformers are first and second output terminals of the VCO, respectively. First terminals of the first and the second transistor are respectively coupled to the secondary sides of the first and the second transformers. Control terminals of the first and the second transformers are respectively coupled to the primary sides of the first and the second transformers. | 01-27-2011 |
| 20120119838 | OSCILLATION CIRCUIT HAVING NEGATIVE RESISTANCE ELEMENT AND OSCILLATOR USING THE OSCILLATION CIRCUIT - An oscillation circuit including: a negative resistance element; a resonance circuit connected to the negative resistance element; and a stabilization circuit connected in parallel with the negative resistance element to suppress parasitic oscillation, wherein the stabilization circuit includes a variable shunt resistor and a adjusting device for adjusting the shunt resistor. | 05-17-2012 |
| 20120313719 | OSCILLATOR CIRCUIT - An oscillator circuit includes a pair of negative-resistance circuits, a pair of transmission lines coupled to the pair of negative-resistance circuits respectively, a pair of pads that are provided symmetrically to each other with respect to the pair of transmission lines and are to be coupled to each other by a bonding wire, and a synthetic circuit to synthesize output signals of the pair of negative-resistance circuits. | 12-13-2012 |
| 20130154750 | OSCILLATOR REGENERATION DEVICE - A negative resistance device for a multiphase oscillator is disclosed. The negative resistance device is coupled to taps of the multiphase oscillator so that it injects no energy into the oscillator when the oscillator is most sensitive to noise, thereby decreasing the phase noise of the oscillator. The negative resistance device also guarantees the direction of movement of a traveling wave past the taps of the multiphase oscillator. | 06-20-2013 |
| 20130154751 | VOLTAGE CONTROLLED OSCILLATOR - A voltage controlled oscillator includes a split ring resonator (SRR) configured to have meta-material characteristics fabricated on a board, and an energy compensation circuit configured to cause resonant oscillation of the SRR. The energy compensation circuit is fabricated in the form of an integrated circuit. | 06-20-2013 |
| 20140043106 | CRYSTAL OSCILLATOR CIRCUIT - Oscillator circuits are disclosed herein. An embodiment of an oscillator circuit includes a first bias circuit and a second bias circuit. An oscillator first connection terminal is coupled to a node, wherein the node is coupled to the first bias circuit and the second bias circuit. An oscillator second connection terminal connected to the second bias circuit. An increase in the oscillation amplitude of the oscillator increases the current in the second bias circuit and causes a reduction in the bias current in the first bias circuit. | 02-13-2014 |
| 20140184346 | Voltage-Controlled Oscillator Circuit Structure - A voltage-controlled oscillator (VCO) is provided. The VCO includes an oscillator unit disposed on a substrate, and a varactor unit. The varactor unit is coupled to the oscillator unit to form a VCO loop. The varactor unit includes a varactor and at least one control terminal. The varactor is disposed in the substrate, and includes at least two through-silicon via (TSV) structures. The at least one control terminal renders the varactor unit to be biased to change a capacitance value of the varactor. | 07-03-2014 |
| 20150008988 | REACTANCE-LESS OSCILLATOR - A memristor-based oscillator can be fully implemented without any reactance element. | 01-08-2015 |
| 20150333698 | Method and Apparatus Having Enhanced Oscillator Phase Noise Using High Vt MOS Devices - A voltage-controlled oscillator (VCO), includes a resonator circuit connected to receive an input voltage and having a first output node and a second output node; and at least one cross-coupled switching circuit portion, each cross-coupled switching circuit portion comprising a first transistor having a drain connected to the first output node and a second transistor having a drain connected to the second output node, the first transistor having a gate connected between the drain of the second transistor and the second output node and the second transistor having a gate connected between the drain of the first transistor and the first output node, each of the first and second transistors having a threshold voltage that is determined to be the highest threshold voltage available for the process used to create the VCO. | 11-19-2015 |
| 20160204764 | BOOSTING VARACTOR CAPACITANCE RATIO | 07-14-2016 |
| 20170237397 | OSCILLATOR PHASE NOISE USING ACTIVE DEVICE STACKING | 08-17-2017 |
| 20180025098 | METHOD AND APPARATUS HAVING ENHANCED OSCILLATOR PHASE NOISE USING HIGH Vt MOS DEVICES | 01-25-2018 |
