Did You Know...
...that in the early 1940s GE engineer James Wright was charged with a task of utmost importance to the war effort: develop a cheap substitute for rubber that could be used to produce tires, gas masks and a whole host of military gear. Wright tackled the task diligently -- and wound up inventing Silly Putty.
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| Number | Title | Issue Date |
| 7554416 | Multi-band LC resonance voltage-controlled oscillator with adjustable negative resistance cell Provided is an LC resonance voltage-controlled oscillator (VCO) used for a multi-band multi-mode wireless transceiver. In order to generate a multi-band frequency, a capacitor bank and a switchable inductor are included in the LC resonance voltage-controlled oscilla... | 06/30/2009 |
| 7283008 | Oscillator circuit with temperature compensation function An oscillator circuit comprising a resonant circuit which includes a negative resistor, an inductor and an oscillation frequency setting capacitor whose capacitance is varied according to a control voltage based on oscillation frequency data and which outputs a sign... | 10/16/2007 |
| 7221920 | Voltage controlled oscillator, frequency synthesizer and communication apparatus A voltage controlled oscillator includes a resonator configured to resonate with an initial oscillation frequency during starting period of oscillation and a steady oscillation frequency during a steady state oscillation. The resonator includes a film bulk acoustic ... | 05/22/2007 |
| 7161439 | Oscillator delay stage with active inductor According to some embodiments, a circuit includes a ring oscillator delay stage. The delay stage may include a first transistor, a second transistor, and an active inductor. A gate of the first transistor may receive a first input signal, a gate of the second transi... | 01/09/2007 |
| 7075380 | Widely tuneable and fully differential LC oscillator utilizing an active inductor An inductor-capacitor voltage controlled oscillator is implemented using an active inductor. The active inductor may use bipolar technology or CMOS technology. The VCO with an active inductor offers a more compact design and is useable with flip chip technology. The... | 07/11/2006 |
| 7071811 | High performance voltage control diffusion resistor The present invention provides a diffusion resistor that is formed in the substrate. A diffusion region is formed within the substrate that contains a first and second contact region. These contact regions extend downward from the surface of the substrate. A third c... | 07/04/2006 |
| 7061333 | Slot line based high frequency oscillator using two-port element A high frequency oscillator has a substrate, a resonator circuit which is disposed on one principal surface of the substrate and consists of a closed loop-shaped slot line including an inner conductor and an outer conductor, an electric boundary point set on the slo... | 06/13/2006 |
| 7012475 | Method and apparatus for effecting high-frequency amplification or oscillation An apparatus includes a distributed resonant tunneling section with a plurality of inductive portions that are coupled in series with each other between first and second nodes, such that a respective further node is present between each adjacent pair of the inductiv... | 03/14/2006 |
| 6980062 | Oscillator circuit with temperature compensation function An oscillator circuit comprising a resonant circuit which includes a negative resistor, an inductor and an oscillation frequency setting capacitor whose capacitance is varied according to a control voltage based on oscillation frequency data and which outputs a sign... | 12/27/2005 |
| 6933793 | Method of overtone selection and level control in an integrated circuit CMOS negative resistance oscillator to achieve low jitter A stable high-frequency clock pulse apparatus and method including frequency source, overtone crystal unit coupled with a negative resistance oscillator, a bandpass overtone filter and a drive level control is provided. The apparatus can include a frequency multipli... | 08/23/2005 |
| 6650195 | Oscillator with differential tunable tank circuit Many electronic devices, such as computers and printers, communicate data to each other over wireline or wireless communications links. One component vital to such communications is a voltage-controlled oscillator (VCO)--a circuit that outputs an oscillat... | 11/18/2003 |
| 6621331 | Variable negative resistance cell for bipolar integrated circuits An effective means and apparatus for generating a negative resistance including a circuit element that exhibits an increase in current as the applied voltage is decreased. Other embodiments of the present invention provide electronic means for improving t... | 09/16/2003 |
| 6512422 | Oscillator with improved magnetic coupling rejection The present invention provides an oscillator such as a voltage controlled oscillator (VCO) that can supply more stable frequency signals in the presence of strong magnetic coupling caused by external magnetic perturbations. According to one embodiment of ... | 01/28/2003 |
| 6429748 | Oscillation circuits featuring coaxial resonators There is a manufacturing limit on how small ceramic coaxial resonators can be produced, which leads to a limit on the frequency of resonance for these resonators. One technique to double the effective frequency of a ceramic coaxial resonator is to couple ... | 08/06/2002 |
| 6326854 | Coaxial resonator and oscillation circuits featuring coaxial resonators There is a manufacturing limit on how small ceramic coaxial resonators can be produced, which leads to a limit on the frequency of resonance for these resonators. One technique to double the effective frequency of a ceramic coaxial resonator is to couple ... | 12/04/2001 |
| 6323737 | System and method for generating a multi-phase signal with a ring oscillator An oscillator is provided that includes a plurality of bridges and a plurality of transmission lines. Each bridge includes a plurality of negative differential resistance devices. Each transmission line interconnects two adjacent bridges. A clock circuit ... | 11/27/2001 |
| 6169461 | High-frequency oscillating circuit A high-frequency oscillating circuit that is not degraded by external electromagnetic interference. The high-frequency oscillating circuit includes first and second oscillating transistors wherein the bases are connected together directly or via a capacit... | 01/02/2001 |
| 6114930 | Impedance controlled by the phase angle between two signals An impedance device has a first conductor and a second conductor, the first and second conductors being positioned in relation to each other so as to provide magnetic coupling between them. The impedance of the impedance device is controlled by receiving,... | 09/05/2000 |
| 6107893 | Voltage tunable active inductorless oscillator An inductorless voltage controlled oscillator that may be fabricated using CMOS circuit elements. In one aspect, the present invention includes a synthetic inductance formed on a substrate and having first and second power supply terminals and a signal po... | 08/22/2000 |
| 6008701 | Quadrature oscillator using inherent nonlinearities of impedance cells to limit amplitude A quadrature oscillator based on two cross-coupled gm/C cells utilizes the inherent nonlinearity of positive and negative impedance cells to control the amplitude of oscillation, thereby simplifying the oscillator and eliminating the need for an outer con... | 12/28/1999 |
| 5959504 | Voltage controlled oscillator (VCO) CMOS circuit A voltage controlled oscillator (VCO) CMOS circuit wherein back gate terminals of CMOS transistors are used to vary the parasitic capacitances of the transistors. The back gate terminals receive a signal from a variable voltage source so that oscillation ... | 09/28/1999 |
| 5942952 | VCO with multiple negative differential resistance devices A VCO includes a transistor having a plurality of negative differential resistance devices coupled in series to the source terminal of the transistor, with each of the devices having a negative differential resistance operating region. Biasing circuits ar... | 08/24/1999 |
| 5920235 | Voltage controlled oscillator integrated circuit A voltage controlled oscillator has a cross-coupled negative resistance cell formed as an integrated circuit connected to off-chip components of a high-Q resonant tank circuit. To counteract spurious oscillations brought about by package parasitics caused... | 07/06/1999 |
| 5920236 | Oscillator circuit having a power control element to initiate oscillation in a shortened time period An oscillator usable for a TDMA type wireless mobile communication device in which an average current at the communication terminal is decreased. The oscillator has a switching circuit or a timing circuit which controls an operating current of an amplifyi... | 07/06/1999 |
| 5883549 | Bipolar junction transistor (BJT)--resonant tunneling diode (RTD) oscillator circuit and method A BJT, an inductor, and an RTD are configured to define a negative resistance oscillator circuit that is suitable for monolithic integration. The BJT is forward biased so that the RTD operates at a DC operating point (IQ,VQ) on its c... | 03/16/1999 |
| 5850163 | Active inductor oscillator with wide frequency range An active inductor oscillator includes a tank circuit for generating a first differential signal, a common-mode inverting differential buffer for generating a second differential signal in response to the first differential signal, and an integrating circ... | 12/15/1998 |
| 5821820 | Dual band voltage controlled oscillator A voltage controlled oscillator operable on two widely separated frequency bands, such as 900 MHz and 1.8 GHz for example. The voltage controlled oscillator includes two negative resistance generators (32, 34) which share a common tunable tank circuit (26... | 10/13/1998 |
| 5821825 | Optically controlled oscillator An optically controlled oscillator utilizes a HEMT or a PIN diode as a photodetector and either a HEMT or HBT as an active inductor. The optically controlled HEMT active inductor provides a means for tuning the frequency of the oscillator. The optical rec... | 10/13/1998 |
| 5740522 | Method and apparatus for reducing receive band transmitter-chain noise for a portable duplex transceiver Reduction of transmitter exciter chain generated noise from the receive bank of a portable/hand-held duplex transceiver is achieved using a high output power, low-noise voltage-controlled-oscillator (VCO) in the transmitter exciter chain. Using this high-... | 04/14/1998 |
| 5714911 | Quadrature oscillator having amplitude control means based on a trigonometric identity A quadrature oscillator includes an amplitude control circuit that is based upon the trigonometric identity sin2 ωt+cos2 ωt=1. The amplitude control circuit, referred to as a Pythagorator, includes two squaring circuits. Each squar... | 02/03/1998 |
| 5708398 | Dual voltage controlled oscillator using integrated transistor and negative differential resistance diode A dual voltage controlled oscillator including a transistor with a negative differential resistance diode coupled to a first terminal and an inductance coupled to a second terminal. Operating voltages are applied to the gate and drain of the transistor to... | 01/13/1998 |
| 5635879 | Voltage controlled oscillator formed of two differential transconductors A monolithic CMOS phase-lock loop (PLL) circuit provides a high frequency of operation suitable for RF applications. The PLL produces an output clock with high spectral purity and very low jitter. The output clock has a low static phase error relative to ... | 06/03/1997 |
| 5578970 | BICMOS monolithic microwave oscillator using negative resistance cell A monolithic microwave oscillator using a negative resistance cell includes a resonator, a negative resistance cell that employs an active device, an output buffer for voltage and current amplification, and a field effect transistor. The negative resistan... | 11/26/1996 |
| 5489878 | Current-controlled quadrature oscillator based on differential gm /C cells An oscillator including two gm/C stages is disclosed. Each gm/C stage includes a differential pair of transistors, a capacitor, and a tunable current source. Alternatively, multi-tanh n-tuplets can be used in place of the differential pairs in the gm/C st... | 02/06/1996 |
| 5486794 | Variable frequency LC oscillator using variable impedance and negative impedance circuits A variable frequency oscillator which can be implemented entirely in a semiconductor chip, which is variable over a broad frequency range and which has relatively low phase noise, includes a variable impedance circuit, a reactive load connected to an outp... | 01/23/1996 |
| 5479129 | Variable propagation delay digital signal inverter An electronically-controlled variable propagation delay digital signal inverter comprises a digital signal inverter having an input signal port and an output signal port, and an electronically-controlled negative resistance (ECNR). The ECNR is coupled to ... | 12/26/1995 |
| 5446419 | Microwave oscillation apparatus capable of suppressing spurious oscillation In a microwave oscillation apparatus including a negative resistance element, a microstrip line having a first end connected to the negative resistance element and a second end connected to a terminating resistor, and a dielectric resonator magnetically c... | 08/29/1995 |
| 5444422 | Low phase noise high frequency integrated oscillator with minimum pins A low phase noise, high frequency low voltage integrated circuit oscillator has a minimum number of live pins. It includes a three transistor current mirror defining a voltage node and a current node with an emitter follower transistor coupled between the... | 08/22/1995 |
| 5343170 | Voltage controlled oscillator provided with negative feedback biasing A voltage controlled oscillator (VCO) including a negative feedback circuit operates in response to a negative feedback signal generated during active transistor region operation of transistors in transconductance amplifying stages coupled thereto. As a r... | 08/30/1994 |
| 5235293 | Variable frequency microwave oscillator including digital phase shifter as tuning element A resonator (50) is connected in circuit with a negative resistance element (Q3,Q4) for producing oscillation at a resonant frequency of the resonator (50). A digital phase shifter (58) is incorporated into the resonant frequency in accordance with an app... | 08/10/1993 |
