Bizarre Patents
A simulation environment for the sport of boxing utilizing a robotic machine interface system which carries a person.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7522024 | Negative gcircuit, a filter and low noise amplifier including such a filter A circuit for synthesising a negative resistance, comprising first and second active devices, the first device having a control terminal connected to a first node, and the second device having a current flow terminal connected to the first node, and the first and se... | 04/21/2009 |
| 7304509 | Impedance circuit, power supply device There is disclosed an impedance circuit which realizes negative impedance with ease, and a power supply device having negative output impedance. An impedance circuit 1 connected to an external circuit comprises: a current inverter circuit 11 having an ... | 12/04/2007 |
| 7202762 | Q enhancement circuit and method A Q enhancement circuit and method. In a most general embodiment, the inventive circuit is adapted for use with a component having a parasitic resistance R3 and a first resistance R1 disposed in series with the component and an arrangement for ... | 04/10/2007 |
| 7119640 | Chua's circuit and it's use in a hyperchaotic circuit The present invention provides an improved Chua's circuit providing current mode operation, access to all state variables, minimum use of grounded passive elements, and freedom from passive component matching comprising a dual output current conveyer based inductor ... | 10/10/2006 |
| 6985053 | Negative resistance circuit In order to provide a negative resistance circuit which is not influenced by means of change of temperature and source voltage, etc., operates stably and has simple circuit construction, a first stage circuit of the negative resistance circuit is a collector-emitter... | 01/10/2006 |
| 6954123 | Tuning circuit Selectivity Q of a tuning circuit is maximized by using a negative resistance circuit that is not influenced significantly by changes in conditions such as temperature, source voltage, etc. The tuning circuit operates stably and is constituted by a series resonance ... | 10/11/2005 |
| 6944435 | Unconditionally stable on-chip filter and applications thereof An unconditionally stable on-chip filter includes a filtering section and at least one negative resistance module. The filtering section is operably coupled to filter a signal and includes realizable integrated circuit passive components. The at least one negative r... | 09/13/2005 |
| 6870447 | Tuning circuit A tuning circuit using a negative resistance circuit for compensating an equivalent series resistance component thereof is provided. The negative resistance circuit has simple circuit construction and design and adjustment thereof is easy. The tuning circuit compris... | 03/22/2005 |
| 6747531 | Circuit and method for input side impedance matching of a power amplifier in an electronic device A circuit and method for input side impedance matching of a power amplifier in an electronic device. Specifically, the present invention provides an impedance transformer network that includes a negative resistor in series with a bondwire inductor. The network is pl... | 06/08/2004 |
| 6734767 | Diplexer The invention refers to a diplexer, particularly for use in microwave devices, comprising a low-pass filter and a high-pass filter, both having inductors and capacitors. It is suggested that at least one inductor of each of said filters is provided as an active indu... | 05/11/2004 |
| 6628181 | Tuning circuit having a resonance circuit and a negative resistance circuit A tuning circuit is constructed to set Q of the tuning circuit to a high desired value by using a negative resistance value. The tuning circuit is made to oscillate weakly by using a negative resistance circuit, a voltage-resistance converter and a digital-ana... | 09/30/2003 |
| 6583685 | Antenna arrangement A matching circuit for a screen antenna receives on its signal input an MF or LF signal output of a screen antenna and feeds a signal though its signal output via a capacitive feeder to a radio receiver. The matching circuit includes components which oper... | 06/24/2003 |
| 6504458 | Tuning circuit with controlled negative resistance In order to automatically set a Q value to an optimal value, a tuning circuit has a resonance circuit composed of an inductor and a capacitor. The resonance circuit includes a negative resistance circuit having a dummy load resistance and a negative imped... | 01/07/2003 |
| 6366172 | Semiconductor amplifier circuit and system The present invention has an objective of providing a semiconductor amplifier circuit having a cascode amplifier in which a negative characteristic of an output conductance is improved at least in a particular frequency band. A semiconductor amplifier 1 i... | 04/02/2002 |
| 6356143 | Method and apparatus for filtering radio frequency signals A variable bandpass filter system passes a selected range of frequencies while rejecting other frequencies in an RF input signal. The system includes a switch and an oscillator. The switch receives the RF input signal and an oscillating calibration signal... | 03/12/2002 |
| 6307442 | Enhanced LC filter with tunable Q A tunable electronic filter circuit is provided including an input terminal and an output terminal connected to the input terminal with a node therebetween. An inductor, a variable capacitor, and a variable resistor are connected between the node and grou... | 10/23/2001 |
| 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 |
| 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 |
| 5939941 | High efficiency power amplifier using HITFET driver circuit A high efficiency power amplifier includes an integrated circuit with a heterojunction interband tunneling field effect transistor (HITFET) amplifier coupled to receive high frequency (into the GHz) RF signals. The HITFET amplifier is constructed to recei... | 08/17/1999 |
| 5890058 | Electronic circuit and filter device using same In an FDNR type active filter fabricated on an integrated circuit, an FDNR circuit is provided wherein one ends of a first capacitor and an impedance element are connected to an inverted input of an operational amplifier, one ends of the impedance element... | 03/30/1999 |
| 5726613 | Active inductor An active inductor having a greater inductance, low loss, and which is small is provided by the present invention. The active inductor comprises a common source FET and a cascode-connected common gate FET connected thereto for providing unidirectional fee... | 03/10/1998 |
| 5550520 | Monolithic HBT active tuneable band-pass filter An active tuneable band-pass filter is provided which has a negative resistance circuit for generating a tuneable amount of negative resistance for a passive band-pass filter structure so as to compensate for resistive losses. The negative resistance circ... | 08/27/1996 |
| 5451915 | Active filter resonator and system and negative resistance generator usable therein A negative resistance generator includes first and second terminals; first and second inductors connected in series between the terminals; and a semiconductor amplifying device having a first control electrode connected to the first terminal and a first a... | 09/19/1995 |
| 5424686 | Negative-resistance-compensated microwave buffer A monolithic microwave buffer amplifier is adapted to increase its input impedance at microwave frequencies. Capacitive reactances in first and second stages of the buffer amplifier appear collectively at the input of the first stage as a negative resista... | 06/13/1995 |
| 5343172 | Variable reactance circuit for microwave or millimeter wave band and variable matching circuit using variable reactance circuit Series reactance elements constituted by capacitors are connected to an input side corresponding to the gate electrode of an amplifying FET and an output side corresponding to the drain electrode of the amplifying FET, respectively. Parallel variable reac... | 08/30/1994 |
| 4995054 | Data transmission using switched resonance A transmission arrangement includes a switched resonant circuit (5) for switching data states of digital signals on a pair of transmission lines (1, 2) and a regenerative circuit (7) for feeding power back on the lines. The switched resonant circuit has a... | 02/19/1991 |
| 4963845 | Synthesis of electrical impedances A monodirectional, current-reducing impedance magnifier (MCRIM) provides continuously variable magnification of any general impedance Z0 without affecting its phase charateristics. The monodirectional, current-reducing impedance magnifier circu... | 10/16/1990 |
| 4943956 | Driving apparatus A driving apparatus for electrically driving a vibrator constituting an acoustic apparatus, wherein the output impedance of the driving apparatus is negative at least one frequency associated with the output sound pressure of the acoustic apparatus among ... | 07/24/1990 |
| 4904952 | Differential amplifier incorporating negative resistance A differential amplifier capable of achieving a large amplification, a wide frequency range, a high common mode rejection ratio, and a wide dynamic range simultaneously includes a device to produce negative resistance connected to output terminals. The di... | 02/27/1990 |
| 4816788 | High frequency band-pass filter A high frequency band-pass filter which includes a single resonator or a plurality of resonators adapted to pass a high frequency signal of a predetermined frequency band region, and an active element device electrically coupled with one or the plurality ... | 03/28/1989 |
| 4751480 | One port magnetostatic wave resonator An overcoupled resonator having a resonant cavity defined by a thin film of magnetic material with a pair of end walls parallel to a transducer. Because this resonator is overcoupled, it is suitable for use in a broadband oscillator.... | 06/14/1988 |
| 4720665 | Signal transducer A transducer for converting electrical input signals into an electrical or mechanical output. The transducer employs a circuit for producing a negative source impedance and a winding cooperating with the circuit. The winding has first and second parts con... | 01/19/1988 |
| 4686486 | Active filter having series resonant active filter terminated by parallel resonant active filter A fourth (or higher) order filter has a series resonant section terminated by a parallel resonant section, both based on frequency dependent negative resistance (FDNR). The FDNR, resistance and capacitance (representing damping) of the series section are ... | 08/11/1987 |
| 4644306 | Programmable electronic synthesized capacitance A predetermined and variable synthesized capacitance which may be incorporated into the resonant portion of an electronic oscillator for the purpose of tuning the oscillator comprises a programmable operational amplifier circuit. The operational amplifier... | 02/17/1987 |
| 4608543 | Controllable effective resistance and phase lock loop with controllable filter Disclosed is a circuit providing a controllable effective resistance which comprises of transistor means that provides current at an input node responsive to an input voltage at the input node. The transistor means is coupled to a settable current source ... | 08/26/1986 |
| 4554504 | Negative resistance compensated transformer A compensated circuit for use in interfacing a transmission device to a cable facility. The circuit includes a transformer one winding of which is connected to the cable facility and the other winding of which is connected through an impedance generating ... | 11/19/1985 |
| 4532384 | Line feed circuit including negative impedance circuit Communication lines for example telephone loop circuits are typically terminated with line feed circuits such that d.c. and a.c. terminating impedances are dissimilar. The line feed circuit includes tip and ring feed resistors of similar ohmic values for ... | 07/30/1985 |
| 4527073 | Shielded electrical cable system Shield of telecommunications cable is grounded through negative impedance converter to reduce induced voltage in conductors in the cable caused by electromagnetic field of nearby powerline.... | 07/02/1985 |
| 4518930 | Negative resistance circuit for VCO A high-frequency negative resistance circuit for use in a voltage controlled crystal oscillator has a pair of input terminals thereby defining an input current and input voltage. The high-frequency negative resistance circuit includes a sensing circuit fo... | 05/21/1985 |
| 4491807 | FET Negative resistance circuits FET circuitry is described which may be substituted for a programmable unijunction transistor particularly on CMOS-FET integrated circuits. The FET circuitry is arranged between first and second terminals defining a conduction path exhibiting a negative r... | 01/01/1985 |
